Thread: Removing Drill pinion
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Unread 18-02-2004, 05:07
Alan Ing Alan Ing is offline
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Re: Removing Drill pinion
Hi all, just thought I'd throw in my two cents. First of all our team (368) is taking a year off (everyone is burnt out), so unfortunately we won't be able to join in on all the fun.

Over the past two years we have been removing our pinion gears using an arbor press which has been a real pain as those gears are on pretty tight and have more than once bent our pinion removing fixture.

While rumaging through my tool box the other day, I came across a Craftsman (sears) nut splitter and all of a sudden it occured to me that this might be the easiest (destructive) way to remove it. Since I had a broken bosch motor from last year (brush assembly broke off, I decided to try the nut splitter on the pinion gear to see how it would work. After carefully aligning it on the pinion gear, I grabed the nutsplitter with a wrench so as not to put any pressure on the shaft of the motor and used another small wrench on the screw that forces the nut, or in this case the pinion gear into the anvil. In two seconds, I heard a little cracking sound. The pinion gear is hardened and brittle and with very little pressure at all, the nut splitter put a hairline crack in the pinion gear and it basically just slid off the shaft without damaging the shaft. Basically the anvil gets wedged between the teeth of the pinion and causes the teeth to split apart (the anvil fits between the teeth but does not bottom out) as you apply pressure to the screw.

A nutsplitter from Sears is about $15.00 or so and definitely is the quickest and easiest way I found to remove a pinion gear off of the bosch motor. Only a little pressure is required and but you may have to reset the nutsplitter on the pinion gear as the screw may break a few of the teeth off first.

I wish I had figured this out two years ago which would have saved us a lot of time. If anyone has an old damaged bosch, try it for themselves. It works great. Just remember to go slow and easy on the screw as it doesn't take much effort.

Again, this method will work as long as you don't mind destroying the pinion gear. Lastly, I only tried this on last years bosch motor so it might not work that well on the fp motor which has a much larger pinion gear.

If anyone tries this, let me know how it worked for you.

Oh well, have fun, wish we could be compete with you all as we never did make a robot that could pull itself up on a bar.