UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

G6Tanuki · 9th Feb 2019, 8:15 pm

I'd be reluctant to do it - the biggest hole I've ever free-punched in cast-alloy was for a RCA "Nuvistor" triode and that was only about 0.7 inch.

For 'holing' diecast where I can't specify the holes as part of the original casting, I've used "cone-cut" stepped borers, or when it comes to an 8x6 hole for a loudspeaker, drilling a load of 3mm holes. knocking-out the centre, then taking-out the rough edges with a rotary file.

9th Feb 2019, 8:15 pm	#2
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,007	Re: Using hole punches on die cast boxes I'd be reluctant to do it - the biggest hole I've ever free-punched in cast-alloy was for a RCA "Nuvistor" triode and that was only about 0.7 inch. For 'holing' diecast where I can't specify the holes as part of the original casting, I've used "cone-cut" stepped borers, or when it comes to an 8x6 hole for a loudspeaker, drilling a load of 3mm holes. knocking-out the centre, then taking-out the rough edges with a rotary file.