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Old 6th Feb 2016, 1:30 pm   #109
frankmcvey
Rest in Peace
 
Join Date: Jan 2015
Location: Cottesmore, East Midlands, UK.
Posts: 858
Default Re: Mullard Valve Tester Card Project

Gauge plate - serious stuff! I'm in the process of doing one, but it'll just be in MS - initially at least - with a 7mm silver steel punch.

My younger brother runs a small engineering business in Dalbeattie. He's had the CAD drawings for a punch jig drawn up, but I'm still waiting for him to make it.

How do you plan to do the punch? I'm wondering if a sinusoidal cutting edge similar to the old Q-Max chassis hole cutters (drawing attached) would give a cleaner hole, rather than just a brute-force flat-ended punch.

Cheers,

Frank
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