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Thumper

3K views 2 replies 2 participants last post by  ol blue 
#1 ·
I've got a piece of 4" exhaust tubing I plan to use as a rear bumper some day and want domed ends for it. I looked on line and found 4" Welch plugs but I'd have to buy 100 minimum. I decided to make my own.

I started by wailing on a piece of 16 ga with a 2 lb ball pien hammer to stretch it in the middle. This makes it very lumpy. To smooth it out, I used a special tool I've had made up for a while. What it was is a vinyl covered dumbell weight I bought when I needed a piece of cast iron a while ago. What was left, I turned down and polished the face pretty good. Working the lumps out with this thumper against a piece of 2" steel plate I have for a bench block made some pretty nice domes. Here's a pic of the domes and my thumper and another weight I haven't peeled the vinyl off of yet.
 

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