Building 8 x 20 ft CNC machine

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16 Dec 2023 12:25 - 16 Dec 2023 12:34 #288322 by aabtech
Hi, am planning to build a 8 x 20 ft CNC machine using  servo motor. using 1 KW AC servo motor and 750W with the rated speed is 3000/ 6000 .1KW for X & Y and 750 for Z. I want to know if the AC servo motor can handle it and what type of mesa board to use and how to set the encoder to mesa board. 
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Last edit: 16 Dec 2023 12:34 by aabtech.

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16 Dec 2023 15:35 #288340 by tommylight
Control cable pinout?

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16 Dec 2023 16:57 #288346 by aabtech
Yes, and the type of Mesa board to use again can the AC servo motor 1kw rated speed of 3000/5000 handle that 8 X 20 feet CNC table.

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16 Dec 2023 17:54 #288350 by tommylight
1KW is to much for any plasma, 400W will do just fine as you do need reduction.
An old Messer industrial plasma with 400KG gantry uses 2 of 500W motors with reduction.
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Pinout of the control cable?
We can not advise you on the board without knowing if the drives have encoder outputs.
If the drive has encoder outputs, Mesa 7i95T has step/dir outputs and encoders inputs, so everything you might need.

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16 Dec 2023 19:18 #288356 by aabtech
The driver has an encoder output. And what will the ratio of the motor reduction be is planetary gear reducer ok?

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16 Dec 2023 19:35 #288358 by tommylight
Yes it is, but beware of the cheap ones, those have a lot of backlash.
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If you can not find Mesa 7i95T, you can also get a Mesa 7i96S and 7i85 or 7i85S.

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16 Dec 2023 20:10 #288363 by RDA
Replied by RDA on topic Building 8 x 20 ft CNC machine

Yes, and the type of Mesa board to use again can the AC servo motor 1kw rated speed of 3000/5000 handle that 8 X 20 feet CNC table.

Its not about size, its about weight. You typically have some base ”variables” that somewhat define your setup:
- Mass to be moved
- Max speed to be achieved
- Max acc to be used

Then you roughly find your motor/gearbox/pinion combination. You would want to make sure the torque is enough to get your acc, rpm is enough to get to the speed you want and that the inertia ratio doesnt get too big.

Then just check your gearboxes can handle the speed and torque, then see what the total backlash is and is it inside your specs.

This is a pretty crude/simple approach but should get the sizing to ball park and keep cost/performance in a good level.
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