View Full Version : [Question(s)] Power window motor hardened steel shaft?

06-12-2011, 12:44 AM
Hey gang. You may have seen this before, but here goes:

I am looking to use two power window motors to run a mid sized robot. The motors have small 9 tooth gears at the center of a small shaft. I would like to drill and tap a 3/8" hole so that I can thread a shaft onto it, that will eventually attach to the wheels.

The problem is that I cannot drill into the center of the shaft. I tried all kinds of drills, even carbide, but I can't get a hole started. :sad:

Could this type of metal be too hardened where I can't drill it? Would it be better to just weld a shaft onto the center of the gear? this is tricky, because it has to be exactly in the center too.

Anyone have this experience?

Thanks in advance for the help. :veryhappy:

06-12-2011, 01:32 AM
That's most likely been harden by a heat treating process. Even if you managed to drill that hole you would never be able to tap it.

Welding would work but your right getting center would be tricky.

I would make or find some type of coupler.

06-12-2011, 10:15 AM
Or you could try bringing it to a local machine shop and see if they'll do for you.