181Views8Replies

Author Options:

If I attempt to weld a sprocket onto the shaft of a stepper motor will it damage the motor? Answered

I suspect the answer is yes....anyone got any advise on how to fasten sprockets onto shafts?

Discussions

0
None
seandogue

2 years ago

It depends in part on the size of the shaft, but presuming a little 5mm shaft...you might be able to gas weld to the tip of the shaft using a jeweler's torch, but you'd need to be quick and precise, but I would be more likely to use a fastener for servicing

You can file a flat in the shaft for securing with a grub screw (with necessary precautions when milling around the stepper...silly putty is a recommended blocking material to put in the areas where the shaft exits the stepper body - temporarily - to keep things clean during rework) . You could even file two for two grub screws, or one long one for two screws in a line...

0
None
Vyger

2 years ago

Another possibility is to drill and tap a hole and put in a set screw. But these don't always work for high torque applications.

0
None
Downunder35m

2 years ago

I tried epoxy for this with different results.
Sometimes the drive shaft starts to slip and that is really hard to notice and can cause hours of fault finding - so in any case make some visiböe marking ;)
Welding with a single spot should work and not overheat the motor parts but I do not recommend it.
For basically every type of stepper motor you also get gear systems.
They are usually a tight press fit onto the drive shaft.
Most common material for them is brass.
I would get a suitable gear that would fit your shaft and use silver solder or a standard brazin rod to attach the sprocket to it.
Doing this on a really flat surface will also make sure it is straight.

0
None
afridaveDownunder35m

Answer 2 years ago

thank you downunder...I am considering epoxy myself.....roughen up the shaft a bit and glue..i shall experiment....

0
None
rickharris

2 years ago

Alternatively you could weld a coller onto the socked and bolt the coller to the shaft with a grub screw.

0
None
rickharris

2 years ago

Hard to know - depends on the shaft size and how hot you get it at the magnet end.

0
None
rickharrisrickharris

Answer 2 years ago

I would use epoxy. the stepper isn't going to have a vast amount of torque so you should be OK.