Mesa board suggestion for linear motor/stepper combo?

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02 Jan 2021 16:37 #193854 by BMac71
I’m wanting build my first LinuxCNC machine & looking for suggestions on which Mesa board/boards would be best for my situation. I’m needing to control 2 axes (X,Y) with Kollmorgen linear motors driven by AMC B15 servo drives & Renishaw RGHZ readheads/scales, and the Z axis which will most likely be a Chinese closed loop stepper setup. This is a last minute decision to give up on Mach3/4, so I’m still quite new to the Linux/Mesa world. Any help is greatly appreciated.

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02 Jan 2021 17:47 #193862 by tommylight
What type of control do Kollmorgen drives use ?
Step/dir, analogue +-10V, some type of serial, or one of the XXXBUS types ?

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02 Jan 2021 19:02 #193873 by BMac71
±10v servo amps.

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02 Jan 2021 19:12 #193877 by tommylight
Nice.
I would use the 7i92/7i77 combo and use the second header on 7i92 for step/dir stuff.
Maybe there is something better, so might want to wait a bit for PCW to chime in, but i have used them so many times that i got used to them, right now on this table i have a 7i92 and a 6i26 and a 7i77, latter ones are installed and on all the time my big PC is on, but not using them much lately.

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02 Jan 2021 19:29 #193880 by BMac71
Thanks a ton, I’m going to go check those out right now. I wouldn’t be ordering until Monday so I’ll definitely be checking out what others have to say.
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03 Jan 2021 02:27 #193913 by rodw
If your servos are step and direction, you may like to look at the new 7i95 board which includes encoder inputs.

store.mesanet.com/index.php?route=produc...t_id=343&search=7i95

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03 Jan 2021 02:38 #193919 by rodw

±10v servo amps.


Oops sorry, missed this. The 7i97 bundles it up in one package for +- 10v
store.mesanet.com/index.php?route=produc...oduct&product_id=344

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03 Jan 2021 07:40 #193929 by BMac71
Well, my Z axis will be step/dir, so I’m hoping to find the best board(s) to run the combination.

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03 Jan 2021 07:57 #193931 by rodw
I think you will need 2 boards. There are a few ways to go.
a 7i76e with a 7i77 pluged into it is probably the most flexible

The 7i76e will give you spindle control and encoder, 2 x MPG, 3-4 analog inputs, 5 stepgens some of which can be repurposed into IO pins if not used, 32 inputs, 16 outputs. The 7i77 will do the 0-10v and encoders for you.
Plus the 7i76e is supported by pncconf so you do have a gui tool to configure the board. Some of the new ones are yet to be supported so need to be set up by hand. Which is not a bad thing for a more complex machine...
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04 Jan 2021 01:34 - 04 Jan 2021 01:35 #194001 by BMac71
Thanks a ton for the info! I just ordered the 7i76e & 7i77. After much reading last night I’m pretty sure I’m also going to use another 7i76e + a THCAD on the plasma table I’m getting ready to start building. Once again, thanks a ton!
Last edit: 04 Jan 2021 01:35 by BMac71. Reason: Grammar.

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