lathe turret control On Denford Orac

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18 Jun 2016 03:19 #76237 by jmelson
A customer asked me what I knew about controlling a lathe turret. Well, not too much, but i know it has been done.
He has a Denford Orac, and it apparently uses a DC brush motor to advance the turret, then applies reverse current to the motor to back it onto a stop. It has 3 sensors that give Gray code indication of the turret position.

I'm pretty sure somebody has already done a turret that works this way. Are there any sample configs available for this?

Thanks for any pointers on this!

Jon

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20 Jun 2016 10:51 - 20 Jun 2016 10:52 #76307 by andypugh
I don't know if this was for DC motor or stepper:

It's for a relay-controlled DC motor.

wiki.linuxcnc.org/cgi-bin/wiki.pl?Contri...oolchanger_component
Last edit: 20 Jun 2016 10:52 by andypugh.

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20 Jun 2016 15:30 #76321 by cncbasher
it uses a dc motor , which reverses to a stop using 24v in fwd mode , and a drop to 12v in reverse
if your stuck with this i can help with the full setup

it uses the original grey encoder and has direct feedback to the io control , so shows the actual tool number in axis
see the pages of the wiki for most of the info

it's essentially the same for an emco toolchanger too , although they i think use a stepper , but the mechanics are the same as a orac

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20 Jun 2016 17:53 - 20 Jun 2016 17:54 #76323 by jmelson
Andy,

Thanks so much, I was looking for this but did not find it. Your Google-fu is better than mine!
Last edit: 20 Jun 2016 17:54 by jmelson.

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