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Setting up 5i25 with 7176 for two machines

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06 Mar 2016 09:25 #71112 by Clive S
Setting up 5i25 with 7176 for two machines was created by Clive S
Is it OK to set up two machines with one 7i76.

Machine one would be lathe with encoder on spindle A B + index for threading. X and Z steppers. and hopefully two rotary hand wheels for jogging (and using without cnc)

Machine two would be a mill with X, Y, Z steppers plus separate homing switches and a probe.

I would also like to fit separate jogging and feed hold buttons as well.

I was hoping to set this up with two profiles ie start PC in lathe config and then restart with mill config. (one at a time) will this cause any problems as the second config will have the step/dir starting at 2,3,and 4 as 0 and 1 would be connected but not used.

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07 Mar 2016 12:59 #71146 by andypugh
Replied by andypugh on topic Setting up 5i25 with 7176 for two machines
No, that's absolutely fine.

I have a very similar configuration, except that in my case it is the same machine. (A lathe/mill combo)

In Mill mode X is Stepgen.0, Y is Stepgen.1, Z is Stepgen.2, A is Stepgen.3
In Lathe mode X is Stepgen.1 and Z is Stepgen.0. I have a change-over relay driven by an output pin that switches between the spindle motors from a common VFD.

With a parallel port you only need to switch the pin assignments, but with a 7i76 the pins are hard-code to the stepgen, so you need to configure the stepgen numbers in the Axis sections of the HAL.

You may run out of MPG inputs. You can conveniently add more with a 7i73.

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07 Mar 2016 13:32 #71154 by Clive S
Replied by Clive S on topic Setting up 5i25 with 7176 for two machines

In Mill mode X is Stepgen.0, Y is Stepgen.1, Z is Stepgen.2, A is Stepgen.3
In Lathe mode X is Stepgen.1 and Z is Stepgen.0.

Andy Thanks for the response But I don't think I am following you. You seem to be using the same Stepgens for mill and lathes.

I am using 5 drives 2 for the lathe and 3 for the mill I want to leave them connected. If you have the time would you mind pointing me in the right direction with some board 7i76 pin numbers to get me started.

Is it possible to use the MPG on some input pins. I will use the spindle encoder on encoder input TB3 7i76 board ref

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07 Mar 2016 13:54 #71157 by andypugh
Replied by andypugh on topic Setting up 5i25 with 7176 for two machines
Clearly your machine is not my machine :-)

All I was saying with the example was that you can allocate axes to stepgens in any way you want.
The pin to stepgen-number arrangement on the 7i76 is fixed and documented in the manual.

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07 Mar 2016 14:15 #71159 by Clive S
Replied by Clive S on topic Setting up 5i25 with 7176 for two machines

Clearly your machine is not my machine :-)

All I was saying with the example was that you can allocate axes to stepgens in any way you want.
The pin to stepgen-number arrangement on the 7i76 is fixed and documented in the manual.


Andy I think I have just had a light bulb moment. I think you are saying you have a stepgen for each axis but you can have say X on both machines connected to that stepgen with different pins.

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07 Mar 2016 14:35 #71160 by andypugh
Replied by andypugh on topic Setting up 5i25 with 7176 for two machines
Well, yes and no...

You can't change the pins.

Mill:
net X-position-cmd axis.0.motor-position-cmd => hm2_5i25.0.7i76.0.stepgen.00.position-cmd
net Y-position-cmd axis.1.motor-position-cmd => hm2_5i25.0.7i76.0.stepgen.01.position-cmd
net Z-position-cmd axis.1.motor-position-cmd => hm2_5i25.0.7i76.0.stepgen.02.position-cmd

Lathe
net X-position-cmd axis.0.motor-position-cmd => hm2_5i25.0.7i76.0.stepgen.03.position-cmd
net Z-position-cmd axis.1.motor-position-cmd => hm2_5i25.0.7i76.0.stepgen.04.position-cmd

(I made up the 7i76 pin names, they might be wrong)

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07 Mar 2016 14:38 #71161 by Clive S
Replied by Clive S on topic Setting up 5i25 with 7176 for two machines
Thank you Andy that is very helpful :)

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