emco compact 5

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01 Aug 2022 09:47 #248781 by carpa1970
emco compact 5 was created by carpa1970
hello people, kindly I need help: I would like to convert an Emco Compact 5 Cnc lathe, with stepper motors, economic Vevor servomotor (all already in my possession) and Mesa card.
I would like to know which Mesa to buy in order to manage everything and be able to run G76 and G84.
I state that I do not know anything about programming!
Is it possible to do it?
sorry my english!

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01 Aug 2022 11:48 #248783 by RotarySMP
Replied by RotarySMP on topic emco compact 5
I used a Mesa 7i96 on a small stepper powered lathe project.
Mark

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02 Aug 2022 04:38 #248817 by carpa1970
Replied by carpa1970 on topic emco compact 5
Thanks for the reply!are you used an AC servo for the spindle?

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02 Aug 2022 05:06 #248819 by RotarySMP
Replied by RotarySMP on topic emco compact 5
I used  a regular VFD and 3Ph induction motor. The 7i96 can be set up to output one channel of PWM signal, so I used a cheap PWM to analog board to convert that to the 0-10V analog signal for the VFD speed control.
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01 Oct 2022 19:53 #253197 by Masiwood123
Replied by Masiwood123 on topic emco compact 5
do you use a spindle encoder for g76 or is it enough for a vfd or ac servo driver to read the real RPM speed, I mean, can the feedback index from the encoder be bypassed when threading?

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02 Oct 2022 09:23 #253232 by RotarySMP
Replied by RotarySMP on topic emco compact 5
Default for is the use of an encoder including  index signal. Though there is a LinuxCNC setting to accept only an index pulse per rev for threading. . You cant sync without at least the index pulse though.

Both of my lathes have an encoder driven with 1:1 toothed belts off the spindle.

If you have a 1:1 toothed belt drive between the AC Servo and the spindle, you could use the servo's encoder, but it would need to be a very powerful servo to have enough torque.
Mark

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02 Oct 2022 09:52 #253235 by Masiwood123
Replied by Masiwood123 on topic emco compact 5
thank you very much, I asked how I could try, not to try in vain if it can't, the ratio is 1:1, I don't have any problem installing an encoder, but I'd rather avoid it if possible. the engine is roughly strong, 2.3kw and the driver reads realistically with a minor deviation in revolutions, say +-5 rpm. I'll let you know how it goes when I finish the lathe.

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02 Oct 2022 10:03 #253236 by RotarySMP
Replied by RotarySMP on topic emco compact 5
Cool set up.

That should work fine for threading. If you try to take a cut that is too deep, the axis motion should follow the spindle into the stall, halting the tool in the thread.

 
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