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Old 11-20-2018, 07:37 PM
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milomilo milomilo is offline
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Default Center Punches

I made a couple center punches about 30 years ago using engine valves. They served me well since that time. Last week I had to drill a hole and looked for a center punch for 15 minutes. Finally gave up and used an auction center punch I had in the drawer and I expect it was an import as the point flatten out on the first hit.

Stopped in at my mechanics shop in town and asked if he had any old engine valves he could part with. Left with 9 of them. Several large Cat valves and a few smaller ones. Cut off the heads in the cutoff saw and used a cordless drill to spin them on the grinder to a 30 degree point.

Turned out well. Tested them and found they made a good punch mark and still sticky sharp. Dropped of a large and a small to Bubba next door.

Stocked the rest and maybe I can go another 30 years before I need to make some more.
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Old 11-20-2018, 08:02 PM
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Chris is always busy!
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Old 11-20-2018, 09:13 PM
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How well will they do as pin punches ?
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Old 11-20-2018, 10:23 PM
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Quote:
Originally Posted by GWIZ View Post
How well will they do as pin punches ?
Probably good, but I have no way to turn/grind them down to different diameters. Not sure what grade or alloy they are, but surely hard as hell. Suppose I could make a few for whatever size I get them in.
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Old 11-20-2018, 10:48 PM
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Quote:
Originally Posted by milomilo View Post
Probably good, but I have no way to turn/grind them down to different diameters. Not sure what grade or alloy they are, but surely hard as hell. Suppose I could make a few for whatever size I get them in.


You have a lathe. Fab up a holder to hold your hand grinder in your tool holder.


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Old 11-20-2018, 11:31 PM
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You have a lathe. Fab up a holder to hold your hand grinder in your tool holder.


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I should have been more clear. Yes, that can be done, but I do not wish to have grinding grit all over the lathe. I know it can be covered somewhat, but I would prefer not to do grinding on my lathe. I have many pin punches already. so I do not really need any more anyway.
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