19-tooth FP pinion on a Banebot 550 motor?

[jspatz1]

Has anyone successfully made a torque-transmitting press fit of a FP 19-tooth pinion on a Banebot 550 motor? Ours are a slip fit, no interference. Is there a splining, staking, or deformation method to do this, or must it be bored out to add a sleeve?

[Thad House]

We had to mount the CIM-Sim pinion, which is similar, to our 550s. to do this we applied red loctite to the pinion and then pushed it on. It has stayed solid for days is still holds after much testing.

[Hawiian Cadder]

We used vice grips and a lot of careful work to knurl our 550's today, its not the right way to do it but with a little patience they turned out great. Just use the vice grip to deform the shaft with the vice grip pattern. Worked well on ours and we don't have a problem with the pinion being off center.

[billbo911]

Unfortunately, the BB RS550 has a smooth shaft and it's OD is identical to the FP 19 tooth pinions' ID.
We drilled and tapped our pinion for a set screw. We then assembled the pinion to the shaft using Loctite 609. 609 is specifically made for cylindrical assembly's with a gap of up to .005". It has a sheer strength of 3000 Lbs. It works like a charm.

[jspatz1]

Got it. Messed up the shaft clamping it in a serrated vice. Tight fit.

[COL Woodchuck]

Loctite has several products that should work well with slip fit assemblies. My company has been using it to secure a similar pinion onto a 4mm servo motor shaft. At fist I thought it would never work but after years of use and hundreds in the field I have yet to hear about a single failure with the Locktite secured pinion. Make sure both parts are clean and dry. Loctite makes a primer that will allow a quicker setup time but does not increase the strength any. We used loctite 680 for our pinions. Just read the data sheet for the product you're using and follow the directions.

[ToddF]

We had a pinion come loose from a motor shaft today. I'm hoping it was just a case of the parts not being cleaned before bonding. If not, we'll be trying the vise-grip knurl tomorrow.

[Mr V]

Note Loc-tite has 3 different stud and bearing mount formulations that are designed for three different ranges of lack of fit. The thicker stuff won't work when you've only got a couple thousands to fill and the thin stuff won't work when you've got a fair amount of gap to make up. Using their primer is definitely recommended. The other option is the green 290 is another option it is for fasteners that are already assembled. It is designed to wick into very tight spaces and then cure.