EEVblog Electronics Community Forum
Electronics => Mechanical & Automation Engineering => Topic started by: coppercone2 on April 01, 2021, 06:05:20 am
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So I know this machine exists, I saw it years ago on youtube from harbor freight but I just cant recall the name or find it.
Basically sometimes you want a star washer to go into a chamfuer hole, i.e. in HP equipment. I saw a jig a while back that looked like a buncha bowl shaped craters in a metal block, with holes iirc, so you put the washer in, then put a appropriate ball bearing on top, then bend it into a bowl shape some how (press or hammer).
It cost like $25. Does anyone know of the kit? or an alternative? I think it was made for making belveill type washers or something.
I thought to drill a chamfuer hole into a steel block and try it that way, but IIRC the geometry of this was rounded, rather then inverted cone.. I think that leads to better bends\
it had like 20 of those craters and bearings so you can do various sizes
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Are you sure it was for shaping washers for chamfered (countersunk) holes? As you mention, I am pretty sure it would be for making Belleville Washers? I believe those are indeed formed using a ball bearing, although they are referred to as "conical" washers when actually they're more like a dome with a bit missing.
I've never seen a press like this for sale, although I have no doubt they exist. It does seems to be a bit too niche for a place like Harbour Freight. If you have access to lathe and mill then it is something you could knock up pretty quickly for use on a small press. For production purposes it would be hardened.
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Sorry for the late reply, but I think this is what you were looking for:
https://www.harborfreight.com/hand-tools/chisels-punches-stamps/25-piece-doming-block-and-punch-set-93539.html (https://www.harborfreight.com/hand-tools/chisels-punches-stamps/25-piece-doming-block-and-punch-set-93539.html)
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yes thats it, I have a few more HP repairs coming up so maybe when I loose more washers and screws I can look into it to do a bulk chassis repair at a value
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That is a neat tool (posted above) to have .
I swear I am not affiliated with McMaster Carr.
But you could just buy them already shaped for about the same cost. https://www.mcmaster.com/standard-washers/lock-washers/countersunk-external-tooth-lock-washers/ (https://www.mcmaster.com/standard-washers/lock-washers/countersunk-external-tooth-lock-washers/)
Or even cheaper if you can find them elsewhere.
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Hehe the picture of the wooden base says dombing block.
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The tool is also known as a Dapping block.