Hello Guest it is May 25, 2019, 07:45:59 PM

Author Topic: Prima Lathe conversion  (Read 27417 times)

0 Members and 1 Guest are viewing this topic.

Re: Prima Lathe conversion
« Reply #10 on: September 25, 2013, 05:48:07 AM »
Khalid,

The SS-USB gives two parallel ports worth of I/O's and SS-Etherenet give three PP's. On the other hand UC100 is a very compact size (just the size of a 25 pin connector cover) and gives just one PP. UC300 gives you 5 PP's worth of I/O's. UC300 also gives you two analog inputs and two analog outputs with these. I am using UC for their superior support for I/O's. A machine under development here in Karachi needs 46 I/O's so I went for the UC series. Price of UC100 is 80 Euros and for UC300 is 105 Euros. If you need one, do let me know. I am going to order a few in weeks to come.

Zafar

Offline khalid

*
  •  213 213
    • View Profile
    • My Wood carving
Re: Prima Lathe conversion
« Reply #11 on: September 25, 2013, 06:28:56 AM »
Thanks for the offer... I have purchased Gecko few year back and now fabrication CNC router.. I feel no need to purchase the UC or smooth stepper for the time being nor i have knowledge how to use them.. Getting old and office work is getting tough and tough and unfortunately not related to my hobbies..
I want to quit myself from Stepper stuff and want to get acquaintance about servos but the price of servos are too high so far.

I really love your work and you are literally one of the honest and technical giant in this field i know.. May be someday you be my mentor;)
Re: Prima Lathe conversion
« Reply #12 on: October 08, 2013, 11:44:03 AM »
Drives enclosure, PC enclosure, pedestal etc. are back from the paint shop. Here they are after some assembly. The front plate engraving is in progress at this time. Ball screws and servo motors assembly fixtures will start getting machined tomorrow.

Zafar
Re: Prima Lathe conversion
« Reply #13 on: October 09, 2013, 09:42:30 PM »
Here is the PC front panel after fitting all the stuff.

Re: Prima Lathe conversion
« Reply #14 on: October 11, 2013, 03:57:40 AM »
Replacing x-axis acme lead screws with a ball screw is always difficult for conventional lathes. I had to replace a 5/8" lead screw with a 15 mm ball screw. The nut wouldn't fit in the recess on the x-axis saddle. Ended up with machining off one end of nut mounting flange and machining a pocket in the slide to accommodate the other flange. The recess in the saddle had to be machined 1 mm at one side.

Offline Hood

*
  •  25,820 25,820
  • Carnoustie, Scotland
    • View Profile
Re: Prima Lathe conversion
« Reply #15 on: October 11, 2013, 05:53:28 AM »
Looks to be quite a course pitch on the ballscrew.
Hood
Re: Prima Lathe conversion
« Reply #16 on: October 11, 2013, 06:14:35 AM »
Yes, it's 10mm pitch. Rather coarse for the cross slide. But it was the best I could get without waiting. I am going to put a 1:2.5 reduction on it through timing pulleys.

Zafar

Offline Hood

*
  •  25,820 25,820
  • Carnoustie, Scotland
    • View Profile
Re: Prima Lathe conversion
« Reply #17 on: October 11, 2013, 06:18:52 AM »
Ah ok, its not as much as I thought, looked to be 16mm or so from the pic, maybe just because of the smaller dia

Hood

Offline khalid

*
  •  213 213
    • View Profile
    • My Wood carving
Re: Prima Lathe conversion
« Reply #18 on: October 30, 2013, 09:54:07 AM »
wow..nice control panel. I am looking for more pictures.

Offline vre

*
  •  20 20
    • View Profile
Re: Prima Lathe conversion
« Reply #19 on: November 30, 2013, 03:10:22 AM »
Sorry for the of topic (if there is a problem please delete it)
Hello!
Iam new member and i want to convert my lathe like yours.
I haven't done any cnc conversion before and i need some help.
I have a lathe like that http://images.ua.prom.st/28306498_w640_h640_27032013431.jpg with 2.2kw 3phase spindle motor and 1.4m z axis distance.
I want to buy for x and z axis 2 servo motors+drivers or 2 stepper motors+drivers but i don't know what motors and drivers to choose(power/rmp/torque).
If i put servo motors i will need reduction by pulleys and timing belts but what ratio reduction will be optimal ?
For spindle what encoder will be ok ?
thank you.