my new CNC machine

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07 Jan 2021 10:21 #194345 by sibelius
my new CNC machine was created by sibelius
Good Evening to everyone

I almost finish building the structure of my new cnc machine.

The machine at this point is basically a 4 axis router pushed by nema34-12Nm closed loop stepper but, my final goal is to add another 2 axis.
I have another similar machine (router 4 axis) that I built out of wood and controlled by mach3.
Now I want to control this new machine with linuxCNC and in prevision to add another 2 axis I'd like to know if someone can suggest a suitable "brain".

Thank in advance for any help.
Regards
V.
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07 Jan 2021 11:46 #194352 by tommylight
Replied by tommylight on topic my new CNC machine
If by "brain" you mean the motion controller, the a Mesa 7i76E would be a nice choice, but 7i95 would be even better as it has also encoder inputs for all axis just in case you want to add linear scales later on for better precision, although that would be an overkill.
Also, 7i76E is very easy to setup while 7i95 requires some hand editing of the config files, again easy, but not as easy as the 7i76E.
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08 Jan 2021 02:24 #194459 by sibelius
Replied by sibelius on topic my new CNC machine
Hi, Thank you for your answer

Yes, by "brain" I mean exactly the motion controller, I use to call this object "board" or "scheda (in my language)".
I will have a look and try to find some documentation on the Mesa 7i76E.
Thanks again for your help

Regards
V.

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08 Jan 2021 04:18 - 08 Jan 2021 04:21 #194465 by sibelius
Replied by sibelius on topic my new CNC machine
Hi
Just had a quick look at the Mesa 7i76E.
As I suspected a few questions arise.
My Nema 34 are provided with an integrated encoder (two cable comes out from the back of the each motor, one is the encoder the other is the coil to power them up).
My stepper driver are also able to close the loop between them and the stepper, so basically what I send to the board would be just the direction and the pulse signals.
In my understanding the Mesa 7i76E cannot close the loop with the encoders in the motors ( even if it could, do I needed to do that instead to just use the drivers to close the loop?)
My other question is: this board seem to be able to drive up to 5 stepper motor but my machine as a router as already 4 stepper motor so I cannot drive the 2 other motor I am planning to include in the system in the future.
Last one: Does this card needs 24v input DC supply?

Am i right or I did not understand or are there other solutions?

Thanks for any help
Regards,
V.
Last edit: 08 Jan 2021 04:21 by sibelius.

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08 Jan 2021 10:54 #194476 by tommylight
Replied by tommylight on topic my new CNC machine
Yes there are other solutions, the easiest would be adding another 7i76 ( without E ) so you can drive 10 steppers and 2 fully controlled spindles, or i think a 7i85 is cheaper and add 4 more steppers, but not sure since i never used a 7i85.
Or there is the 7i96 and 7i76 combo, should be cheaper and still have 10 steppers in total and plenty of IO.
Even cheaper would be using a 7i92 or 5i25 or 6i25, just one of them, they have 34 IO in total and there are plenty of firmware for them for steppers, pwm, encoders etc, buy must be very careful with wiring as they have 5V IO.
Adding linear scales is just another option, not a requirement, but they have become so cheap that a lot of members here use them.
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08 Jan 2021 12:36 #194481 by sibelius
Replied by sibelius on topic my new CNC machine
Hi,
Thanks again for your help.
I need to study a bit more on those cards.
I will be back with a wiring diagram when I get rid off a bit of fog from my brain.

Thanks again, I much appreciate your help
Regards,
V.
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09 Jan 2021 07:33 #194566 by sibelius
Replied by sibelius on topic my new CNC machine
Hi, me again
i was evaluating all the options.
I was looking at the solutions with the mesa 7i92 but then I have to use two break board to reach 6 stepper.
Researching I found that the most suggested is the Gecko board (very expensive and I need two of them).
So there are some cheap break board to match the 7i92 ?
I start to think that probably my best option is the mesa 7i76E and when upgrade add another 7i76; should work.
Thanks again

Regards,
V.

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09 Jan 2021 08:03 #194568 by Mike_Eitel
Replied by Mike_Eitel on topic my new CNC machine
If I'm not wrong there is a posibility to add a normal (Chinese) Bob on one of the two Px-plugs. Plus you have to load other firmware in 7i76e. Maybe pcw can chime in..
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09 Jan 2021 08:36 #194570 by sibelius
Replied by sibelius on topic my new CNC machine
Hi
thanks for your help
I will probably go with the mesa 7i76e.
Now another "issue" arise.
I live in Australia and if i purchase the mesa from the US it is going to cost me double the actual price.
Does anyone knows if i can buy mesa product in australia"
Thanks

Regards
V.

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09 Jan 2021 08:44 #194571 by phillc54
Replied by phillc54 on topic my new CNC machine

Hi
thanks for your help
I will probably go with the mesa 7i76e.
Now another "issue" arise.
I live in Australia and if i purchase the mesa from the US it is going to cost me double the actual price.
Does anyone knows if i can buy mesa product in australia"
Thanks


mesaus has quite reasonable shipping prices to Oz.

mesaus.com/
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