Crt.5 plastic spur

Originally Posted by lincpimp

Then I tried to drill the steel spur for holes to mount the plastic spur. That did not work, as the steel spur is super hard. I even tried to aneal the spur to soften it up, that did not work either. I ended up cutting slots with a fiber disk to place the screws. I clearanced the screw side for the countersunk screws and used nuts to hold the plastic spur on. Not pretty, but it works. I plan to clean it up with the dremel and dust it with some paint.

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I have made a some 1/8 scale plastic spur gear adapters similar to this. we didn't used to have the options we have now. I too discovered how hard it is to drill through these parts. What I discover is that you can dremel with a diamond bit in the spot you want to drill. Then you have to use bits designed for hardened steel. Available at most hardware stores. Drill press is a must. Buy at least few of them, they get dull or break and bounce off your forehead so be sure to wear safety glasses. No joke I had one bounce off my forehead at very high velocity.

What I did was take a spur. I think it was an ofna 47t steel spur. I stuck the spur in a drill and spun it against a grinder wheel to remove the teeth as evenly as possible. then drilled the holes to hold on a ofna 51t plastic spur. It worked very well.

It looks very similar to what you have.

[lincpimp]

I had some tin coated bits, but cobalt one would have been better. I actually like the slots, as they let the screw angle a bit, which aids in getting the nuts on. Not much room to work with, I had to use pliers to hold the nut as I screwed it. (can't wait to hear what everyone thinks of that last sentence)

I used a bench grinder to grint the teeth off, then put a screwdriver shaft thru the hole in the spur and held it against the grinding wheel. I used another plastic handle to slow the spin of the spur, and that evened out the area that I ground the teeth off. It is almost perfectly round, and that does not really matter, as nothing touches that edge.