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David G4EBT · 5th Sep 2017, 1:47 pm

On the basis that 'a picture paints a thousand words', I've just drilled a 32mm (1.25") diameter hole in a 12mm thick piece of Tufnol with a Forstner bit. It took just 3 minutes at 680 RPM in a pillar drill with no lubrication - no dramas.

Hope that helps.

5th Sep 2017, 1:47 pm	#10
David G4EBT Dekatron Join Date: Feb 2003 Location: Cottingham, East Yorkshire, UK. Posts: 5,760	Re: Drilling Tufnol On the basis that 'a picture paints a thousand words', I've just drilled a 32mm (1.25") diameter hole in a 12mm thick piece of Tufnol with a Forstner bit. It took just 3 minutes at 680 RPM in a pillar drill with no lubrication - no dramas. Hope that helps. Attached Thumbnails __________________ David. BVWS Member. G-QRP Club member 1339.