Faulhaber 141:1 6VDC Gearhead Motor

I've got some of these powerful little suckers. A real plus is the built in encoder. The only problem is that the hex set screws on the gears come loose and I've got nothing to tighten them up with. .9mm is too small and 1.3mm is too big. Internet searches seem to point to 1.0mm is a standard size but I've not been able to come up with a source. Can anyone give me a lead? Thanks - Scotty

Local hardware or home center. Get one of the "jack-knife" type allen key sets. Makes it harder to lose the small ones. Of course it means when you lose the little one the whole set has to be looked for...

hex keys.jpg

Have both SAE and metric sets. No key even comes close. These things are tiny; roughly .039". - Scotty

A small flatblade jeweler's screwdriver that will fit in across the corners might work to get some tightening on the screws.

You sure it's an Allen socket (hex) and not a TorX

A small flatblade jeweler's screwdriver that will fit in across the corners might work to get some tightening on the screws.

Yes, this may give enough torque to snug them up but I need to deliver enough torque to ensure they are tight.

You sure it's an Allen socket (hex) and not a TorX

Yes, examined under a loupe.

Hi, do you know the running/stall torque on these?

Hi, do you know the running/stall torque on these?

Sorry, no. But here Faulhaber Gearmotor with Encoder - Robot Room is a site with much information about these motors. - Scotty

I have a similar problem with some small hex grubscrews holding a knob on a small but expensive (£30+) pot on a Canon zoom demand. I bought one of these sets http://www.maplin.co.uk/33-piece-precision-screwdriver-set-48941 some time ago and as the hex bits taper slightly I ground the top off little by little until it was a snug fit in the grubscrew and allowed me to release it.