23-05-17, 08:52 AM
(22-05-17, 07:20 PM)Drezza link Wrote: Managed to drill the hole 5mm diameter 22mm deep, had to use carbide drill bits in the end, cobalt were useless!
Now I've tried tapping the hole and having no luck again, the taps are HSS to I've got a feeling I'd need carbide taps too (if they even exist??)...
How on earth did you do it Unfazed??
You will need to ensure they are tapered taps as Drezza said. I got very high quality tapered taps from a local tool shop. I will check this evening as to what type/make they are.