13-03-2022, 09:15 AM
I have some 'cobalt' badged drills which dont seem to get through a 2mm-ish stainless plate (an old wide spreader blade) I was trying to make into a coverplate for the fuel pump aperture.
I did research last night and notice that cobalt comes in 5% (M35?) and 8% (M42) but that also Cobalt introduces instability - i.e. more chance of snapping.
Any advice on drills generally? I'd like to buy a set which work on everything, but now confused. I'm also confused by the badging of drills. Do people use imperial which seem to be pricier, or just work with metric sets which rise in 0.1 intervals, and convert?
I did research last night and notice that cobalt comes in 5% (M35?) and 8% (M42) but that also Cobalt introduces instability - i.e. more chance of snapping.
Any advice on drills generally? I'd like to buy a set which work on everything, but now confused. I'm also confused by the badging of drills. Do people use imperial which seem to be pricier, or just work with metric sets which rise in 0.1 intervals, and convert?