Rim Sanding Jig

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Tj Turner
Gidgee
Posts: 4
Joined: Fri Nov 01, 2013 2:10 pm

Rim Sanding Jig

Post by Tj Turner » Sun Jan 04, 2015 5:34 pm

Evening all...

I thought I'd share the new jig I finally got around to finishing. I've been tired of my old sanding jig being a little too flimsy, so I tried to make something sturdier. I still need to drill the holes that will bolt down the mold, and I think I have a unique solution for leveling up the sides (which I'll post as soon as I get my next rim built up).

But for now...here's the jig. I use a sine-table like device with a precision ground 1.5" shaft in the center. The shaft is held in place by brass bushings, and then a collar holds the shaft in place at the bottom of the central structure. I did that because eI used to have issues with my old jig, where the shaft would pull out when I tried to dismount the radius disks. I also didn't like my old way of setting the angle, so instead I made a sliding fixture with a 1" round dowel (I may replace this with a 1" precision ground shaft, but there is probably little advantage). I have a Matlab script running that tells me acutely what angle I need to be in order to square up either my back or top rims, and therefore the setback for the dowel along the jig.

I think this will be a much better more secure method to sand my rims...
Attachments
RimSander-1.jpg
RimSander-2.jpg
RimSander-3.jpg

Tj Turner
Gidgee
Posts: 4
Joined: Fri Nov 01, 2013 2:10 pm

Re: Rim Sanding Jig

Post by Tj Turner » Sun Jan 04, 2015 5:35 pm

A few more shots for clarity...
Attachments
RimSander-4.jpg
RimSander-5.jpg

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