Using Pololu sockets for external stepper drivers

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Bertus Kruger
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Re: Using Pololu sockets for external stepper drivers

Post by Bertus Kruger » Sat Oct 08, 2016 5:57 am

Levictus wrote:So will theses work for the 2.58 version of the board as well?
Yes, it will work with any board that uses Pololu stepper drivers and will redirect the signals to the connection where the stepper would have been hooked up to.

Levictus
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Re: Using Pololu sockets for external stepper drivers

Post by Levictus » Mon Oct 31, 2016 12:32 pm

Power question...
I have the external driver boards coming for a new build. Previously, I had the Pi hat powered with a 24v 240w power supply with Nema17s. The motor package I'm looking at has:
4PCS Nema 23 Stepper Motors 57BYGH627 3.0A 190N-cm(270 oz-in) 76mm
4PCS stepper motor drivers DQ542MA 4.2A 50VDC 125Microsteps
2PC power supply 350W 36V
I know the external drivers get connected directly to the (2?)350w power supplies. Does the Pi hat need an external supply in this case as well? If so can it handle 36v or do I need another solution? Thank you!

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Re: Using Pololu sockets for external stepper drivers

Post by Bertus Kruger » Mon Oct 31, 2016 9:13 pm

With external driver the Raspberry Pi CNC hat does not need the power.

If you are mixing it with the normal Pololu driver they will still need it to power the hat and power the external drivers...

Levictus
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Re: Using Pololu sockets for external stepper drivers

Post by Levictus » Thu Nov 10, 2016 1:58 am

Just got my little boards in the mail...
I'm still into my build, anyone have pics of their wiring setups to externals (other than the previously posted ones)?

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Re: Using Pololu sockets for external stepper drivers

Post by Levictus » Fri Nov 11, 2016 7:10 pm

Upon removing my Pololu drivers, do I also remove the jumpers underneath prior to installing the external boards? Sorry for all the questions, but I can't really afford to fry anything at the moment...

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Re: Using Pololu sockets for external stepper drivers

Post by Bertus Kruger » Sun Nov 13, 2016 10:17 pm

Levictus wrote:Upon removing my Pololu drivers, do I also remove the jumpers underneath prior to installing the external boards? Sorry for all the questions, but I can't really afford to fry anything at the moment...
The Jumpers should not make a difference as they are connected to other pins not used by the external driver sockets.

rmasci
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Re: Using Pololu sockets for external stepper drivers

Post by rmasci » Mon Nov 28, 2016 11:28 pm

OK I tried this and have it connected to a TB6560. I have a 1000x1000mm x-carve and I tested this out, and I have double checked everything to make sure it's connected right. When I try to go just 10mm it goes 30, or if I try to go 1mm it goes 3mm. Any idea what I am doing wrong? I've tried a bunch of different settings on the TB6560...

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Re: Using Pololu sockets for external stepper drivers

Post by Bertus Kruger » Tue Nov 29, 2016 2:37 am

rmasci wrote:OK I tried this and have it connected to a TB6560. I have a 1000x1000mm x-carve and I tested this out, and I have double checked everything to make sure it's connected right. When I try to go just 10mm it goes 30, or if I try to go 1mm it goes 3mm. Any idea what I am doing wrong? I've tried a bunch of different settings on the TB6560...
That's great progress....

To fix this you need to tune the following settings:
$100 (x, step/mm)
$101 (y, step/mm)
$102 (z, step/mm)

if your machine is moving 3x more than it needs then you need to divide the settings current value by 3. (Needs to be done for each axis)

Also keen in mind that if you change the micro stepper it will change this ratio.

rmasci
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Re: Using Pololu sockets for external stepper drivers

Post by rmasci » Mon Dec 05, 2016 2:49 am

Bertus Kruger wrote:
That's great progress....

To fix this you need to tune the following settings:
$100 (x, step/mm)
$101 (y, step/mm)
$102 (z, step/mm)

if your machine is moving 3x more than it needs then you need to divide the settings current value by 3. (Needs to be done for each axis)

Also keen in mind that if you change the micro stepper it will change this ratio.
That worked perfectly! I did this for each axis... I put a metal measuring stick under the spindle and measured each movement until i had 1mm per move... Then tested it at 10mm and then 50mm and so on.

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Re: Using Pololu sockets for external stepper drivers

Post by Bertus Kruger » Mon Dec 05, 2016 6:19 pm

Nice work!!! now the fun starts... :)

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