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T-Jet Gear Lapping Tub

5/3/2015

 
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This gear lapping tub is to help in lapping gears on a T-Jet chassis. When lapping gears things can get messy... so this little tool is to help reduce the mess and hold the chassis stable while lapping the gears.

I started with an Auto World case top.
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Then cut from styrene the mounting posts and mounting post feet.
For T-Jets, the back mounting post is 1/2 inches long and the front mounting post is 5/8 inches long
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I drilled holes in the mounting feet and glued the posts to the feet... trying to make sure the posts were perpendicular to the feet.
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I then mount the chassis to the post before gluing into the top. This will ensure the posts are properly located.
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Now I glue everything to the top. 
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The feet provide for more gluing surface and a stronger bond.
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The chassis is mounted upside down to minimize the mess and also to make it easier to attach the alligator clips to the pick-up shoes when providing power. 
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Addendum: do not mount the chassis upside down. Attach the chassis right side up when actually lapping the gears.
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Addendum 11/28/16: I picked up a train transformer to supply the power instead of the 9 volt battery. The transformer has forward and reverse as well as variable speed.
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With the power supply upgrade I decided to up grade the tub to make it more convenient to use. I modified a pair of pick up shoes so that I could more easily attach the alligator clips on the outside of the tub. I also added two posts so that when the chassis is mounted in the tub there would be an electrical contact.
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Below is the whole contraption hook up.
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If you would like more information about lapping gears, you can go here.

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