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What you have there is essentially a rack wrapped around the shaft axis. A rack will mesh with any gear of the same DP. You need to establish what DP the "rack" is then find a gear that meshes with...

I really can't say you're right or wrong, and I'm sure the module can be improved but I do know my simple work-around works for me.

As my PSU has both 5v and 24v O/Ps my bit of a bodge workaround is to apply the 24v via a relay operated by the 5v IYKWIM.

This sounds like the DIRECTION signal isn't getting through the BoB. Have you had a meter on the input and output pins in question?

The advert for this far eastern variant of these boards at TB6560 3A stepper motor drive single-axis stepper motor driver board controller | eBay seems to be a little more realistic on the...

That's exactly the sort of thing I had in mind.
I do think lucas's theory has more than a little merit and kt88's mod should overcome the issues IMHO.

I would speculate the power-up sequencing is the single biggest cause of premature demise of this driver IC. I suspect the internal upper and lower FETs may both conduct until the logic has full...

Technical fix - Put it back as it was to start with and if it works leave it alone. If it doesn't it's buggered.

I have one of the single axis boards in front of me now. There seem to be a few variants and I'd like to make a few comments on the particular example I have.

The one I have only has provision to...

An over-temperature buzzer would be a useful addition to a warning LED.

Part of the reason for the component density in modern high speed CPUs is to minimise propagation delay within the chip. We don't clock our steppers anywhere near as fast so we can space them out a...

I've encountered a similar issue in the set-up I'm integrating. In my case I'm probably going to retain the optos on the BoB and eliminate the optos on the single TB6560 board. This allows me to...

Your description suggests it is loosing steps in one direction only. Could there be a timing issue between the step and direction signals?

I assume this will require you to manually control the power-up sequence. I have some similar boards and what I had in mind was to remove the 5v regulator to a piece of stripboard and use that to...

I'm afraid you won't get a lot of current out of this board. All outputs, incoming and outgoing, are derived directly from EL817 optos.

Another late posting on these boards.
I've recently obtained one of these boards and all indications are they are capable of delivering full isolation. At the moment I'm looking at the slew-rate of...

Lucas may I suggest you retain the option on the final PCB to retain the diodes for those of a nervous disposition. Elimination of them doesn't make such a great saving. Assuming someone is building...

Nice work Lucas. Methinks you'll be in demand for kits, or at least PCBs, globally.

PM sent

I was thinking of those with stock to use up on a well designed board. I.e decent optos as you indicated earlier.
Perhaps I mis-read things but my interpretation of articles elsewhere on such...

Doesn't that also open the PCB up for use with the TB6560 (I haven't checked every pinout) and using a sequencer within the PSU?
Not for cost saving, but if not possible of no consequence. My...

A couple of comments.

1. I would have thought complete opto-isolation (i.e. separate grounds) is a preferred option, to protect the PC's LPT port, so long as the selected optos have a high enough...

I think you noticed my error at the same moment I also did. At least it appears to have true opto-isolation.

I'm sorry for coming in so late. However, if you prefer a separate driver for each axis these may prove to be OK. One Axis Single 3.5A TB6560AHQ Stepper Motor Driver Board f CNC Router Semi-Flow |...

Whilst slaving drives is a good solution you may try a series arrangement first if your PSU has plenty of volts headroom. The current rise time will be slightly extended but identical in both stepper...

Cheap 24V or 36V PSUs can be easily constructed by connecting two or three PC PSUs in series following the appropriate precautions.

To me, it looks like you've produced a nice compact design that includes pretty much all the features the vast majority of folk would want.

I'm sure others would join me in asking you to keep...

Also known as the "spit test". If you spit at it and it spits back it's too hot.

I would suggest you look for a cheap P4 machine with a paraport on e-bay or somesuch.

Do you intend releasing the PCB layout to the great unwashed on this forum?