584,860 active members*
5,399 visitors online*
Register for free
Login
IndustryArena Forum > MetalWorking Machines > Benchtop Machines > Mini Lathe > Yet another mini lathe CNC conversion
Results 1 to 8 of 8
  1. #1
    Join Date
    Jan 2014
    Posts
    13

    Yet another mini lathe CNC conversion

    This mini lathe is branded by Proma (a Czech toolmaker), but it is a pretty standard SIEG lathe.

    Click image for larger version. 

Name:	Proma.jpg 
Views:	1 
Size:	60.8 KB 
ID:	474907

    I purchased it couple of years ago and since then I was implementing my CNC conversion on the weekends (with long pauses for running other projects between the steps). In this blog I’m going to describe conversion solutions I used step by step.

  2. #2
    Join Date
    Jan 2014
    Posts
    13

    Re: Yet another mini lathe CNC conversion

    I would like to extend my gratitude and appreciation to the members of CNC Zone Mini Lathe forum, whose posts gave me a lot of ideas and strongly influenced engineering decisions of this conversion. Though I did not directly replicate any of published conversions, I used your experience shared in this forum. Especially I would like to thank Simon C for his thread “7x14 cnc conversion”.

  3. #3
    Join Date
    Jan 2014
    Posts
    13

    Re: Yet another mini lathe CNC conversion

    Quote Originally Posted by IgorA View Post
    I would like to extend my gratitude and appreciation to the members of CNC Zone Mini Lathe forum, whose posts gave me a lot of ideas and strongly influenced engineering decisions of this conversion. Though I did not directly replicate any of published conversions, I used your experience shared in this forum. Especially I would like to thank Simon C for his thread “7x14 cnc conversion”.
    Now in a couple of years the project is finished - I milled another lathe plate and changed X-axis speed ratio to 1:1 - see the photo. Now I have stable CNC turning and threading with different rates. It was a lot of fun to do this project

    Click image for larger version. 

Name:	IMG_0134.jpg 
Views:	11 
Size:	99.4 KB 
ID:	405116

  4. #4
    Join Date
    Nov 2007
    Posts
    361

    Re: Yet another mini lathe CNC conversion

    Quote Originally Posted by IgorA View Post
    Now in a couple of years the project is finished - I milled another lathe plate and changed X-axis speed ratio to 1:1 - see the photo. Now I have stable CNC turning and threading with different rates. It was a lot of fun to do this project

    Click image for larger version. 

Name:	IMG_0134.jpg 
Views:	11 
Size:	99.4 KB 
ID:	405116
    Im just now coming across this thread . It is 7 years old but I sure could use some of your ideas would you be interested in sharing /selling your plans for the conversion like drawings , blueprints , wiring diagrams ? Just thought I would ask because this is one of the best 7x conversions WELL DONE sir !!!!!!!!!!!

  5. #5
    Join Date
    Jan 2014
    Posts
    13

    Re: Yet another mini lathe CNC conversion

    Thank you, I would definitely be glad to share some of the drawings and program code I used in the project, but unfortunately I do not have a full set - many simple parts were created "as is", without any documentation. I'll look in my archives and publish what I have in the next few days.

    Frankly speaking, if I would start this project today, I would definitely go other ways in some decisions - the main mistake I've done was trying to use drive and electronics of the original design. It would be much simpler and functional to drop the original electronics and spindle drive and replace it with a powerful stepper drive - there are Nema 34 motors with virtually same size and power as the original DC drive. The control scheme would me trivial in this case, as well as the significant increase in functionality could be achieved.

  6. #6
    Join Date
    Nov 2007
    Posts
    361
    Quote Originally Posted by IgorA View Post
    Thank you, I would definitely be glad to share some of the drawings and program code I used in the project, but unfortunately I do not have a full set - many simple parts were created "as is", without any documentation. I'll look in my archives and publish what I have in the next few days.

    Frankly speaking, if I would start this project today, I would definitely go other ways in some decisions - the main mistake I've done was trying to use drive and electronics of the original design. It would be much simpler and functional to drop the original electronics and spindle drive and replace it with a powerful stepper drive - there are Nema 34 motors with virtually same size and power as the original DC drive. The control scheme would me trivial in this case, as well as the significant increase in functionality could be achieved.
    Yes thank you any notes or suggestions would be appreciated and I agree 100 percent with the spindle the electronics are a bit out of date on these type/style "mini lathes ". I am looking forward to seeing the material you are able to share I like the style of your machine and again great job

  7. #7
    Join Date
    Jan 2014
    Posts
    13

    Re: Yet another mini lathe CNC conversion

    Quote Originally Posted by Michael82 View Post
    Yes thank you any notes or suggestions would be appreciated and I agree 100 percent with the spindle the electronics are a bit out of date on these type/style "mini lathes ". I am looking forward to seeing the material you are able to share I like the style of your machine and again great job
    Well, to start with here are DXF files for the X-axis holder. 12 mm for the top horizontal plate and 10 mm for the main vertical plate. Depths.txt shows depths of deepenings in the vertical plate (in mm's).

  8. #8
    Join Date
    Nov 2007
    Posts
    361
    Quote Originally Posted by IgorA View Post
    Well, to start with here are DXF files for the X-axis holder. 12 mm for the top horizontal plate and 10 mm for the main vertical plate. Depths.txt shows depths of deepenings in the vertical plate (in mm's).
    Wonderful yes this is perfect to start with thank you

Similar Threads

  1. Mini Lathe CNC conversion
    By kevind in forum Mini Lathe
    Replies: 2
    Last Post: 07-26-2014, 04:05 PM
  2. Mini Lathe Conversion by Newbie
    By cycledbarn in forum Mini Lathe
    Replies: 4
    Last Post: 01-15-2014, 01:11 PM
  3. Yet Another Mini Lathe CNC Conversion
    By chafik in forum Mini Lathe
    Replies: 12
    Last Post: 06-10-2008, 05:15 AM
  4. CNC mini-lathe conversion help needed.
    By minilatheman in forum Mini Lathe
    Replies: 5
    Last Post: 05-24-2005, 01:47 PM
  5. Mini lathe conversion
    By kdoney in forum Uncategorised MetalWorking Machines
    Replies: 1
    Last Post: 08-27-2004, 04:21 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •