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The spec sheet tell you the coils have 0.7Ohms. 5.2*0.7 = 3,64V rated voltage and the thermal (resistive) load is 5.2A*3,64V = ~19W (x2).
There will be some added thermal effect from the magnetic...

I think the spec of the 34 and 42 may be refering to different parameters.
The motors are characterised by current and coil resistance only. The rated voltage is a means of telling the resistance...

What do you mean by input voltage ?
If you mean the driver power supply rail be informed that 5V sounds awkwardly low. I would be acually surprised if those chopper driver circuits inside would even...

Shure that 24V rating is read correct ?
Maybe it is 2.4V and the dot weathered away.

I have actually never heared of a motor rated for the rule ot thumb driver voltage. The rated voltage is...

That's a linear limiter.
Are you aware of the power dissipation ?
Assuming using 60V and 1.2A you will get more than 60W in each driver. Per coil.
That's more than 250W total and requires quite a...

I wasn't refering to the application but the electrical driver cicuit you have chosen for controlling the steppers. You just mentioned using a PIC, but left out the more important output stage.
The...

36V is realy critical.
Can the supply being adjusted ?
Most of them feature a poti to adjust the output voltage.
I would try around 30V as maximum.

You might be disapointed, but a battery charger is no power supply.
It might work but it would possibly require quite elaborate and sofisticated changes to replace a normal power supply with...

Stepper motors are not about voltage but are controlled by constant current.
The TA8435 board are usually set to a constant current of 1.5A.
For good performance you would actually nedd more than...

Don't forget to read the main thread about those boards: http://www.cnczone.com/forums/showthread.php?t=79654
Specialy note the remarks about power supply choice and understanding the correct power...

How about discrete logics to convert the old +cw/+ccw to step/dir. It seems to be not about speed.
Any idea of the signal timing ?

Step seems to be simply a XOR of CW and CCW.

For Dir I would...

Hi Doug, No idea, sorry.

You might better open a new thread.
Hidden inside here the visibility or your question is rather limited.

TA8435 has in internal H-bridge. Not shure what you did with the external Mosfets.
May I suggest posting a shematic how you wired an external bridge to this or it might become difficult to help.

Why havn't I tought about that.
I'm using EMC2 and have frankly seen the stepgen component seen wired to outputs in my own HAL files.

I just warn you that EMC2's HAL is quite flexible but also...

I belive it has the same difficulty as using the Phidget controller. No probem as long as you want to make your own controller software.
But practice proves that you need step and direction input to...

That 50$ limit seems to call for some frustration.
I have some serious doubts you can meet that without building the controller by yourself. That seems to include making your own PCB. The PCB is a...

Have you looked at the sources from EMC2 ?

While you are at it you may hang around a while and might even try it out.
May be you finally find the idea of rolling your own might be waste of time...

How about a soldering iron and some tin :rainfro:

Please be more precise what you what to do.
More current: wire the coils in parallel
These MUST be identical coils and MUST be the same phase...

There is already a quite elaborate thead for these eBay boards: http://www.cnczone.com/forums/showthread.php?t=93048


Also you may have to note that the optocouplers are not realy isolated. The...

Usable yes, but the voltage seems a little low.
Steppers are driven with constant current and the driver voltage should be as high as your driver circuit (L298 allows up to 45V peak) allows.
If you...

Quite unusual indeed.

8 wire motors are intended for unipolar drive.
In that case one of each phase coils is wired reverse as the current direction can not change like in a bipolar setting....

I don't belive it would be a problem having a rigid coupling of two motor.
That's provided that the motors are connected identically to the same driver and they are aligned .

Wether they can...

30mm ?
Sound a little small. Even Nema 17 has 42mm cubed.

I would have some serious doubts that these motors can move something more severe like a lathe. May need some rather large gearing, which...

This seems to indicate that the monochrom wires match with the white+color wire. Should be also simple to verify with an ohm meter as the should show connection.
As a result you have the individual...

Sound like nonsense.
You CAN set microstepping to as high as your driver provides. Even setting 100.000 microsteps (not that I know any driver for this) is possible.

What is the question of how...

Forget driver voltage.
Steppers run with constant current drivers.

Your motor is for 0,5A (derived from 5VA[=W]/10V).
The driver board is 1,5A, so no, your motor is to weak to run it without...

I don't think so.
Most driver ICs will read the setting after .reset.
Very likely it will simply have no effect.



Very likely not as 1/4 and 1/8 are not much apart torque wise.

I had some...

Well said, I couldn't sum it up better :)
It's strange that people expect these cheap boards to match parts that are two levels uphill.

As for your stalling example I would like to add that this...

Did you take the saturation voltage for this calculation ?
Typically it might be a lot lower as the average current is of cause lower.


For the TB6560 the current rating can be possibly even...

Sorry, you've posted the same already at post #18 in this thread.