[Emc-users] Round column mill/drill conversion

[Tomaz T.]

I'm thinking about converting my jet jmd-18 mill/drill with round column, but thing that worries me the most right from the start is, if Z axis would be accurate enough.

There is one solution by reversing quill spring so it is forcing axis all the time downwards and this way you get rid of backlash on worm gear, next thing is how solve problem with quill lock, which is meant to be used when quill is in desired position (height) so you lock it to increase stiffness (and accuracy) on Z axis. 
So did anyone here did any similar conversion and have a solution or suggestion for this?

here is machine's pic:
http://www.rustan.ru/sites/default/files/JMD-18F.jpg

[Dave Caroline]

On Fri, Jun 21, 2013 at 10:02 PM, Tomaz T. <***@hotmail.com> wrote:
> I'm thinking about converting my jet jmd-18 mill/drill with round column, but thing that worries me the most right from the start is, if Z axis would be accurate enough.
>
> There is one solution by reversing quill spring so it is forcing axis all the time downwards and this way you get rid of backlash on worm gear, next thing is how solve problem with quill lock, which is meant to be used when quill is in desired position (height) so you lock it to increase stiffness (and accuracy) on Z axis.
> So did anyone here did any similar conversion and have a solution or suggestion for this?

I had a round column machine many years ago, I am glad I sold it
I would say a machine like that is unsuited to cnc conversion because
of the column and its need to be clamped
They do make good bench drills though.
There is a reason the spring pulls up, so the backlash is removed and
is held against the worm.


Dave Caroline

>
> here is machine's pic:
> http://www.rustan.ru/sites/default/files/JMD-18F.jpg
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[Art Eckstein]

At 05:02 PM 6/21/2013, you wrote:
>I'm thinking about converting my jet jmd-18 mill/drill with round
>column, but thing that worries me the most right from the start is,
>if Z axis would be accurate enough.
>
>There is one solution by reversing quill spring so it is forcing
>axis all the time downwards and this way you get rid of backlash on
>worm gear, next thing is how solve problem with quill lock, which is
>meant to be used when quill is in desired position (height) so you
>lock it to increase stiffness (and accuracy) on Z axis.
>So did anyone here did any similar conversion and have a solution or
>suggestion for this?
>
>here is machine's pic:
>http://www.rustan.ru/sites/default/files/JMD-18F.jpg


I cnc'd my RF31 about 13 years ago and had the same concerns as you.
Instead of reversing the spring, I got rid of it and replaced it with
a needle thrust bearing and a cap to keep the pinion shaft from
moving in and out (yes, it did and cause some problems as it allowed
the worm wheel ride up and down on the worm enough to break the worm
wheel) and put a counter balance on it to maintain tension.
Then on the right hand side, I loosened the two socket head screws
that holds the fine down feed housing to the head and gently tapped
the housing to make a tighter fit of the pinion shaft to the rack (be
careful as you can do to much!) and finally, as I put my servo on the
fine down feed shaft, removed the chrome bezel and made a proper
sized spacer that is held in by the plate for my servo motor to
rigidly locate the worm shaft so it could not move in and out and
again contribute to backlash. OH and the quill lock is in a drawer
someplace. The servo maintains proper height.

Has worked well for me all these years!

Art
Country Bubba



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[Pete Matos]

Honestly I had a RF31 round column mill drill for quite awhile. Initially I
bought it to help me convert my RF45 I CNC'd and honestly I WISH I had
never sold it. It is a GREAT little benchtop mill and there are a bunch of
folks who have CNC'd them with good results. There are of course some
issues with the round column but there are work arounds that work well. If
I had one here and did not already have a Cincinatti arrow 500 VMC here
working I would consider CNC'ing the round column. A square column RF45 is
a better choice probably but if I found another RF31 for a good price
somewhere I would not hesitate to snap it up again. Peace

Pete



On Fri, Jun 21, 2013 at 5:21 PM, Art Eckstein <***@gmail.com>wrote:

> At 05:02 PM 6/21/2013, you wrote:
> >I'm thinking about converting my jet jmd-18 mill/drill with round
> >column, but thing that worries me the most right from the start is,
> >if Z axis would be accurate enough.
> >
> >There is one solution by reversing quill spring so it is forcing
> >axis all the time downwards and this way you get rid of backlash on
> >worm gear, next thing is how solve problem with quill lock, which is
> >meant to be used when quill is in desired position (height) so you
> >lock it to increase stiffness (and accuracy) on Z axis.
> >So did anyone here did any similar conversion and have a solution or
> >suggestion for this?
> >
> >here is machine's pic:
> >http://www.rustan.ru/sites/default/files/JMD-18F.jpg
>
>
> I cnc'd my RF31 about 13 years ago and had the same concerns as you.
> Instead of reversing the spring, I got rid of it and replaced it with
> a needle thrust bearing and a cap to keep the pinion shaft from
> moving in and out (yes, it did and cause some problems as it allowed
> the worm wheel ride up and down on the worm enough to break the worm
> wheel) and put a counter balance on it to maintain tension.
> Then on the right hand side, I loosened the two socket head screws
> that holds the fine down feed housing to the head and gently tapped
> the housing to make a tighter fit of the pinion shaft to the rack (be
> careful as you can do to much!) and finally, as I put my servo on the
> fine down feed shaft, removed the chrome bezel and made a proper
> sized spacer that is held in by the plate for my servo motor to
> rigidly locate the worm shaft so it could not move in and out and
> again contribute to backlash. OH and the quill lock is in a drawer
> someplace. The servo maintains proper height.
>
> Has worked well for me all these years!
>
> Art
> Country Bubba
>
>
>
> >
>
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>
>
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>

[Marius Liebenberg]

I am busy with mine at this very moment. What I did to overcome the
quill issues was to remove the hand wheel and spring assembly and fit a
motor with reduction directly to the shaft that turns the quill up and
down. Mine has a very tight fit and no noticable backlash. The small
hand wheel on the other hand was poor. I tried to use the spring to
counter the backlash but it was not a good plan.
I use nema 34 motors on the whole conversion. If you are interested, I
could pass the design files on to you.

On 2013/06/21 11:02 PM, Tomaz T. wrote:
> I'm thinking about converting my jet jmd-18 mill/drill with round column, but thing that worries me the most right from the start is, if Z axis would be accurate enough.
>
> There is one solution by reversing quill spring so it is forcing axis all the time downwards and this way you get rid of backlash on worm gear, next thing is how solve problem with quill lock, which is meant to be used when quill is in desired position (height) so you lock it to increase stiffness (and accuracy) on Z axis.
> So did anyone here did any similar conversion and have a solution or suggestion for this?
>
> here is machine's pic:
> http://www.rustan.ru/sites/default/files/JMD-18F.jpg
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by Windows:
>
> Build for Windows Store.
>
> http://p.sf.net/sfu/windows-dev2dev
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--
Regards / Groete

Marius D. Liebenberg
MasterCut cc
Cel: [phone]
Tel: [phone]
Fax: [phone]
Skype: marius_d.liebenberg



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[Tomaz T.]

You are saying that you are retrofitting same model of this machine? If there is a chance, I would rally appreciate to see design that you have.
 

I agree, I was also considering to mount gearing directly on pinion shaft that drives quill up and down, but I think there should be some decent amount of force applied to quill in one direction (probably downwards) to eliminate backlash as much as possible.

I found this thread about retrofitting an old RF mill/drill and he also minimised backlash by reversing spring...
http://www.cnczone.com/forums/benchtop_machines/152240-hf_round_column_mill_drill_build.html



>
> I am busy with mine at this very moment. What I did to overcome the
> quill issues was to remove the hand wheel and spring assembly and fit a
> motor with reduction directly to the shaft that turns the quill up and
> down. Mine has a very tight fit and no noticable backlash. The small
> hand wheel on the other hand was poor. I tried to use the spring to
> counter the backlash but it was not a good plan.
> I use nema 34 motors on the whole conversion. If you are interested, I
> could pass the design files on to you.
>

[Marius Liebenberg]

Its not the exact same picture. Many machines have the exact same frame
but has it own branding. Other things that might chance is the start /
stop buttons the color of the machine and other small cosmetics. My
machine is painted green but believe me, its the same machine. I have
seen several variations of the exact same thing. Mine is just a whole
lot older than yours.

I tried the spring idea but I was not happy with the solution.

I made motor boxes for all four axis. All of them with a nema 34 and a
4:1 reduction. I also replaced all the screws with ball screw and nut.

I have a yahoo group that I use for students that attended my CNC
courses. I will place the design files on and maybe some pictures if you
want. Its really a very simple solution and nothing fancy. I need the
machine to do some specific aluminium parts for which I believe it is
good for. I have milled steel with it before but I felt like the machine
was being stressed so I will stick to softer materials. Well maybe with
the cnc option can afford to take very small cuts on steel and get good
results. Time will tell.

The groups is at
http://tech.groups.yahoo.com/group/cnc_support

I will get some files ready and place them there.



On 2013/06/22 01:58 PM, Tomaz T. wrote:
> You are saying that you are retrofitting same model of this machine? If there is a chance, I would rally appreciate to see design that you have.
>
>
> I agree, I was also considering to mount gearing directly on pinion shaft that drives quill up and down, but I think there should be some decent amount of force applied to quill in one direction (probably downwards) to eliminate backlash as much as possible.
>
> I found this thread about retrofitting an old RF mill/drill and he also minimised backlash by reversing spring...
> http://www.cnczone.com/forums/benchtop_machines/152240-hf_round_column_mill_drill_build.html
>
>
>
>> I am busy with mine at this very moment. What I did to overcome the
>> quill issues was to remove the hand wheel and spring assembly and fit a
>> motor with reduction directly to the shaft that turns the quill up and
>> down. Mine has a very tight fit and no noticable backlash. The small
>> hand wheel on the other hand was poor. I tried to use the spring to
>> counter the backlash but it was not a good plan.
>> I use nema 34 motors on the whole conversion. If you are interested, I
>> could pass the design files on to you.
>>
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by Windows:
>
> Build for Windows Store.
>
> http://p.sf.net/sfu/windows-dev2dev
> _______________________________________________
> Emc-users mailing list
> Emc-***@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>

--
Regards / Groete

Marius D. Liebenberg
MasterCut cc
Cel: [phone]
Tel: [phone]
Fax: [phone]
Skype: marius_d.liebenberg



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[Gene Heskett]

On Saturday 22 June 2013 08:44:01 Marius Liebenberg did opine:

> Its not the exact same picture. Many machines have the exact same frame
> but has it own branding. Other things that might chance is the start /
> stop buttons the color of the machine and other small cosmetics. My
> machine is painted green but believe me, its the same machine. I have
> seen several variations of the exact same thing. Mine is just a whole
> lot older than yours.
>
> I tried the spring idea but I was not happy with the solution.
>
> I made motor boxes for all four axis. All of them with a nema 34 and a
> 4:1 reduction. I also replaced all the screws with ball screw and nut.
>
> I have a yahoo group that I use for students that attended my CNC
> courses. I will place the design files on and maybe some pictures if you
> want. Its really a very simple solution and nothing fancy. I need the
> machine to do some specific aluminium parts for which I believe it is
> good for. I have milled steel with it before but I felt like the machine
> was being stressed so I will stick to softer materials. Well maybe with
> the cnc option can afford to take very small cuts on steel and get good
> results. Time will tell.
>
> The groups is at
> http://tech.groups.yahoo.com/group/cnc_support

I hate to be a killjoy but in order to see the files Marius, one must be a
member of that yahoo group. And you can't join a yahoo group with out
adding another 50 spams to your inbox a day. I get enough get rich quick
and pecker stretching schemes from this or that magic pill vendor as it is.
And huge amounts of it come from yahoo's servers.

> I will get some files ready and place them there.
>
> On 2013/06/22 01:58 PM, Tomaz T. wrote:
> > You are saying that you are retrofitting same model of this machine?
> > If there is a chance, I would rally appreciate to see design that you
> > have.
> >
> >
> > I agree, I was also considering to mount gearing directly on pinion
> > shaft that drives quill up and down, but I think there should be some
> > decent amount of force applied to quill in one direction (probably
> > downwards) to eliminate backlash as much as possible.
> >
> > I found this thread about retrofitting an old RF mill/drill and he
> > also minimised backlash by reversing spring...
> > http://www.cnczone.com/forums/benchtop_machines/152240-hf_round_colum
> > n_mill_drill_build.html
> >
> >> I am busy with mine at this very moment. What I did to overcome the
> >> quill issues was to remove the hand wheel and spring assembly and fit
> >> a motor with reduction directly to the shaft that turns the quill up
> >> and down. Mine has a very tight fit and no noticable backlash. The
> >> small hand wheel on the other hand was poor. I tried to use the
> >> spring to counter the backlash but it was not a good plan.
> >> I use nema 34 motors on the whole conversion. If you are interested,
> >> I could pass the design files on to you.

Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
My views
<http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml>
While my BRAINPAN is being refused service in BURGER KING, Jesuit
priests are DATING CAREER DIPLOMATS!!
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
law-abiding citizens.

[Marius Liebenberg]

Yeah I know. Its a pain. Send me your PM then I will send the files to
you directly. Just give me a little time to put something decent
together for you. I am just busy with a Chinese conversion of a router
box. I will look at it tonight.

On 2013/06/22 02:58 PM, Gene Heskett wrote:
> On Saturday 22 June 2013 08:44:01 Marius Liebenberg did opine:
>
>> Its not the exact same picture. Many machines have the exact same frame
>> but has it own branding. Other things that might chance is the start /
>> stop buttons the color of the machine and other small cosmetics. My
>> machine is painted green but believe me, its the same machine. I have
>> seen several variations of the exact same thing. Mine is just a whole
>> lot older than yours.
>>
>> I tried the spring idea but I was not happy with the solution.
>>
>> I made motor boxes for all four axis. All of them with a nema 34 and a
>> 4:1 reduction. I also replaced all the screws with ball screw and nut.
>>
>> I have a yahoo group that I use for students that attended my CNC
>> courses. I will place the design files on and maybe some pictures if you
>> want. Its really a very simple solution and nothing fancy. I need the
>> machine to do some specific aluminium parts for which I believe it is
>> good for. I have milled steel with it before but I felt like the machine
>> was being stressed so I will stick to softer materials. Well maybe with
>> the cnc option can afford to take very small cuts on steel and get good
>> results. Time will tell.
>>
>> The groups is at
>> http://tech.groups.yahoo.com/group/cnc_support
> I hate to be a killjoy but in order to see the files Marius, one must be a
> member of that yahoo group. And you can't join a yahoo group with out
> adding another 50 spams to your inbox a day. I get enough get rich quick
> and pecker stretching schemes from this or that magic pill vendor as it is.
> And huge amounts of it come from yahoo's servers.
>
>> I will get some files ready and place them there.
>>
>> On 2013/06/22 01:58 PM, Tomaz T. wrote:
>>> You are saying that you are retrofitting same model of this machine?
>>> If there is a chance, I would rally appreciate to see design that you
>>> have.
>>>
>>>
>>> I agree, I was also considering to mount gearing directly on pinion
>>> shaft that drives quill up and down, but I think there should be some
>>> decent amount of force applied to quill in one direction (probably
>>> downwards) to eliminate backlash as much as possible.
>>>
>>> I found this thread about retrofitting an old RF mill/drill and he
>>> also minimised backlash by reversing spring...
>>> http://www.cnczone.com/forums/benchtop_machines/152240-hf_round_colum
>>> n_mill_drill_build.html
>>>
>>>> I am busy with mine at this very moment. What I did to overcome the
>>>> quill issues was to remove the hand wheel and spring assembly and fit
>>>> a motor with reduction directly to the shaft that turns the quill up
>>>> and down. Mine has a very tight fit and no noticable backlash. The
>>>> small hand wheel on the other hand was poor. I tried to use the
>>>> spring to counter the backlash but it was not a good plan.
>>>> I use nema 34 motors on the whole conversion. If you are interested,
>>>> I could pass the design files on to you.
> Cheers, Gene

--
Regards / Groete

Marius D. Liebenberg
MasterCut cc
Cel: [phone]
Tel: [phone]
Fax: [phone]
Skype: marius_d.liebenberg



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[Gene Heskett]

On Saturday 22 June 2013 09:13:28 Marius Liebenberg did opine:

> Yeah I know. Its a pain. Send me your PM then I will send the files to
> you directly. Just give me a little time to put something decent
> together for you. I am just busy with a Chinese conversion of a router
> box. I will look at it tonight.

My PM is in the header. And my mailbox at wdtv.com is gigabytes and emptied
at 3 minute intervals.

I am always curious to see how others have done conversions, occasionally
with an eye to learning a better way than I did it, but I steered clear of
the round column stuff based on a fear of the round column not locking up
at the same X-Y position after a Z move.

I'm your basic retired old fart, a TV Chief Engineer, and have made much of
the stuff it took to cnc both a toy X1, and an elderly 7x12. It now sports
a treadmill motor and controller good for 1 HP, and ball screws. There are
some now old pix on my web page, some of which I should cull out as they
are historical & obsolete. I have pix of much of the lathe conversion to
put on my web page, but they are still in the camera yet. I'm still
looking for a really good round 'tuit' pattern to make some alu coins from
as I've miss-laid the one I had 50 years ago in Rapid City.

That address in the sig is this machine. No advertising other than me
blowing my own horn. It needs a serious re-organization and updating
though. Clearly I have too many hobbies. :)

[...]

Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
My views
<http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml>
Confession is good for the soul, but bad for the career.
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
law-abiding citizens.

[Marius Liebenberg]

Oh and I used the spring to balance the quill. The calculated spec -
with 4:1 ratio is 0.012mm. More than enough I think

On 2013/06/21 11:02 PM, Tomaz T. wrote:
> I'm thinking about converting my jet jmd-18 mill/drill with round column, but thing that worries me the most right from the start is, if Z axis would be accurate enough.
>
> There is one solution by reversing quill spring so it is forcing axis all the time downwards and this way you get rid of backlash on worm gear, next thing is how solve problem with quill lock, which is meant to be used when quill is in desired position (height) so you lock it to increase stiffness (and accuracy) on Z axis.
> So did anyone here did any similar conversion and have a solution or suggestion for this?
>
> here is machine's pic:
> http://www.rustan.ru/sites/default/files/JMD-18F.jpg
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by Windows:
>
> Build for Windows Store.
>
> http://p.sf.net/sfu/windows-dev2dev
> _______________________________________________
> Emc-users mailing list
> Emc-***@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>

--
Regards / Groete

Marius D. Liebenberg
MasterCut cc
Cel: [phone]
Tel: [phone]
Fax: [phone]
Skype: marius_d.liebenberg



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[Roland Jollivet]

On 21 June 2013 23:02, Tomaz T. <***@hotmail.com> wrote:

> I'm thinking about converting my jet jmd-18 mill/drill with round column,
> but thing that worries me the most right from the start is, if Z axis would
> be accurate enough.
>
> There is one solution by reversing quill spring so it is forcing axis all
> the time downwards and this way you get rid of backlash on worm gear, next
> thing is how solve problem with quill lock, which is meant to be used when
> quill is in desired position (height) so you lock it to increase stiffness
> (and accuracy) on Z axis.
> So did anyone here did any similar conversion and have a solution or
> suggestion for this?
>
> here is machine's pic:
> http://www.rustan.ru/sites/default/files/JMD-18F.jpg
>
> ------------------------------------------------------------------------------
>
>
If you have the machine already, why not sell it and buy one of these;
http://image.made-in-china.com/2f0j00CBHtvYeKhWoa/Drilling-and-Milling-Machine-ZAY7045FG-.jpg

For the difference of a square column, and an R8 spindle, I think it would
be worth it. I have a mill like yours, and have examined it many times, but
faced with a sloppy quill, a morse taper and a round column, means too much
of a re-work to be worthwhile.

Regards
Roland

[Tomaz T.]

I was also thinking that way, and put it on "local ebay" and there is quite a lot interest for it, so it will probably be sold in short...
I already briefly went trough available machines (locally) and found this candidate, for reasonable price ..
http://www.bernardo.at/index.php?id=62&L=1&openuid=121&katid=4&groupid=170&product_id=3469&variation_id=3469
It's probably from the same chinese supplier as for other "45" sized versions on the market ...
So anyone here who could give an opinion about its quality and retrofitting possibilities?

>>
> If you have the machine already, why not sell it and buy one of these;
> http://image.made-in-china.com/2f0j00CBHtvYeKhWoa/Drilling-and-Milling-Machine-ZAY7045FG-.jpg
>
> For the difference of a square column, and an R8 spindle, I think it would
> be worth it. I have a mill like yours, and have examined it many times, but
> faced with a sloppy quill, a morse taper and a round column, means too much
> of a re-work to be worthwhile.
>
> Regards
> Roland

[andy pugh]

On 3 July 2013 13:53, Tomaz T. <***@hotmail.com> wrote:

> http://www.bernardo.at/index.php?id=62&L=1&openuid=121&katid=4&groupid=170&product_id=3469&variation_id=3469

My preference (having already converted a Chinese machine, and
part-way through converting a 1970s British machine), is that I would
suggest starting with an old machine, made properly, every time.

Any cheap Deckel or Thiel machines on your local eBay?

--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

[Pete Matos]

Agree with Andy.... Having done a retrofit on an RF45 that was reasonably
good and now having a running Cincinatti Arrow 500 VMC here sans
toolchanger I wish I would have started with a used machine that was higher
quality as well as ALREADY CNC.... There are all sorts of nice machines out
there on the used market large and small and if they were CNC already your
job of retrofitting is considerably easier and the resulting machine will
most likely be far more accurate and precise. Altho some of those deckel
machines are quite complicated to retrofit there are many others including
benchtop machines. Just look around a bit and inspect the machine
carefully for undue wear. Good luck. Peace

Pete




On Wed, Jul 3, 2013 at 9:56 AM, andy pugh <***@gmail.com> wrote:

> On 3 July 2013 13:53, Tomaz T. <***@hotmail.com> wrote:
>
> >
> http://www.bernardo.at/index.php?id=62&L=1&openuid=121&katid=4&groupid=170&product_id=3469&variation_id=3469
>
> My preference (having already converted a Chinese machine, and
> part-way through converting a 1970s British machine), is that I would
> suggest starting with an old machine, made properly, every time.
>
> Any cheap Deckel or Thiel machines on your local eBay?
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
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[andy pugh]

On 3 July 2013 15:15, Pete Matos <***@gmail.com> wrote:
> Agree with Andy.... Having done a retrofit on an RF45 that was reasonably
> good and now having a running Cincinatti Arrow 500 VMC here sans
> toolchanger I wish I would have started with a used machine that was higher
> quality as well as ALREADY CNC.


http://www.ebay.at/itm/190622190310
(How much was the budget for the conversion parts?)

--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

[Tomaz T.]

Due to lack of space, there are only "benchtop" machines in game. This guy did really nice conversion of 45 sized machine ... http://www.cnczone.com/forums/benchtop_machines/122462-pm-45_computer-numeric-control_conversion_rf45-3.htmlI like that he did fixed quill and did conversion on rear slider which seems to be more than enough precise with sliding guides.

> http://www.ebay.at/itm/190622190310
> (How much was the budget for the conversion parts?)

[Pete Matos]

How about a DM2800 or a boxford or something like that, or just a CNC knee
mill like a tree or something. any of these would take up about as much
space as an RF45. I know I had one. Peace

Pete

http://www.practicalmachinist.com/vb/machinery-sale-wanted/dyna-myte-2800-tabletop-cnc-mill-no-30-spindle-162690/



On Wed, Jul 3, 2013 at 12:12 PM, Tomaz T. <***@hotmail.com> wrote:

> Due to lack of space, there are only "benchtop" machines in game. This guy
> did really nice conversion of 45 sized machine ...
> http://www.cnczone.com/forums/benchtop_machines/122462-pm-45_computer-numeric-control_conversion_rf45-3.htmlIlike that he did fixed quill and did conversion on rear slider which seems
> to be more than enough precise with sliding guides.
>
> > http://www.ebay.at/itm/190622190310
> > (How much was the budget for the conversion parts?)
>
>
>
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> This SF.net email is sponsored by Windows:
>
> Build for Windows Store.
>
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> https://lists.sourceforge.net/lists/listinfo/emc-users
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[Bruce Layne]

If starting from scratch, I'd certainly agree with those who recommend
getting a good old machine and converting it to CNC, rather than
starting with a lower quality import. I'm starting with a nice old
Clausing lathe and converting it to CNC use.

The recommendation to start with an older CNC machine that isn't worn
out but may have outdated or broken controls and replacing only the
controls with a PC and LinuxCNC has a lot of merit for the best bang for
the buck.

However, I'm also doing a quick & dirty CNC conversion of a Grizzly
G1006 round column bench top mill/drill. Why? Because my shop is in
the basement and it would be a major undertaking (with some risk to life
and limb!) to get the old milling machine out and a better milling
machine in there. My CNC milling machine needs are fairly simple -
mostly point to point moves and hole drilling. I won't be doing any
complex 3D contour machining or mold making, so the CNC turd polishing
of my old import mill/drill should do OK. The biggest problem is the
slop in the quill, IMO.

Fadal founder David DeCaussin is retired now, and he converted a G1006
into a mini upright machining center. It's the inspiration for anyone
wanting to CNC their round column mill/drill. It's fully enclosed with
flood cooling, has a touch panel FlashCut CNC user interface, and it has
a custom tool changer.

http://youtu.be/Qv-0Cjj0S-o
(9 minute video)

Disclaimer: After converting the G1006 with the idea of selling them to
the hobby market, Dave DeCaussin saw the light and changed his design to
a scratch built machine based on a heavy square tube weldment.

http://youtu.be/b-y03hhCCME
(15 minute video)