Hi,
Thank you for sending out the replacement of GRBL shield I received this week ( version 3).Please let me know the address where I should return the version 2. I tested the new version but still does not work properly.
Can you please let me know what kind of stepper motors you tested with the GRBL shield?
I use 42BYGHM810 which has 2.4 A current and not sure if the IC stepper drivers, you use with GRBL shield, are strong enough to drive my stepper motors.
GRBL shield becomes soon very hot even though I use quite large heatsinks and then stepper motors do not turn properly.
Thank you for your reply.
GRBL shield - how to make it running? page 2
From the original Synthetos forum (2011–2025)
I'm pretty sure the drivers should have no problem with these motors. We have tested the grblshield with very many motors. I'll look around and see if I have some of the Phidgets you have. Can you please provide some more information if you can.
- Try backing off the current as much as possible while the motors are still turning. The drivers should not be getting too hot with these motors, but expect them to get warm.
- How do you have the motors wired up? The green and black are paired and the red and blue are paired.
- What is the current setting? The pot should start in the middle of the range. Please confirm that the pots have not been forced past their limits (and broken).
- What axis or axes are the motors attached to? Are the LED lights flashing? Do you get the same behaviors on other axes?
- Do you have indication that grbl is functioning, and what commands are you issuing to grbl? The same as in your earlier posts?
- What is your grbl configuration? Has this changed from before?
- What is your power supply and is it adequate? Is it delivering consistent voltage when you try to move the motors? Sorry if you already asnwered this but I can't see anything on page 1 of this thread while I'm typing on page 2.
-Alden
I have just wired up a v3 grblshield to a 42BYGHW811 which I got from Phidgets. It's not identical to your motor, but it has the same current rating at 2.5 amps. Mine is a 200 step, I think yours is a 400 step. I have no issues and the chip is getting warm (as expected) but not hot. The sequence of wires on the connector is red-blue-green-black.
Alden,Thank you for your reply.
I think my biggest problem will be frequency.
When I set up $4 for only 300, steper motors seem to be working ok.( But I think I must still make more tests to be sure that frequency is the only problem)
Is there any way how to find out a reliable frequency? Or only try and see?
Where shall I return the previous GRBL shield v2? Which is your address?
Thank you
Jan, the only way to set the maximum feed rate ($4) and seek rate($5) is to try various settings. Set these the same, and start low and go higher. $5 sets the velocity in a G0, $4 sets the maximum feed rate (F word) in G1, G2 and G3. In some cases people set the max feed rate to be lower than the seek rate, but I'd recommend keeping them the same for now to keep it simple.
The acceleration value $8 will also affect the feed rate and seek rate. In some high-speed cases $9 may also need adjustment, but only if you are having problems with cornering.
Please email us at synthetos at gmail.com for a shipping address
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