![]() ![]() While the cardboard box said Cobalt, the tin said nothing, and the bits were only marked HSS. The 'cobalt' bit wouldn't touch the calliper I wanted to drill. ![]() In the end I was seduced by UKDrills (biggest supplier of drill bits on Ebay, or some such).ġ1 out of 10 for Customer Service, 3 out of 10 for product quality. I did think of making multiple sets and using them a Christmas presents to those family members who might appreciate them, but it was still a quality gamble as I hadn't actually used any Beal 5% cobalt bits myself. It was only when I went looking for a 'full set' that I realised the 'Taps and Dies' bits were 8% cobalt.Ī 'full set' appeared to be a luxury I could not afford, so I looked for other suppliers.īeals are a good price, but bits have to be bought in 10 per size. Having started the hole I tried a HSS bit, and another 'cobalt' bit. The 3mm drill started well enough to convince me the task was doable. I have subsequently wanted to drill two 2mm holes in a vernier calliper. Having gone in ~20mm I reversed the drill bit, Loctited it in place, and now had a 3mm drill bit that could make 10 pilot holes (in 4mm steel) past a 6" obstruction. I wanted to drill a 3mm hole along the length of a 1/4" x 12" piece of silver steel round bar. I have bought and used examples of Cobalt drill bits from Taps and Dies. M35's (5% cobalt) seem fairly common and reasonable (25pc 1-13mm 1/2mm increments for £50), M42's (8% cobalt) seem mostly to be available from the US only. I guess I'm like most of you and have a box of drills of various parentage collected over the years, and try to weed out the butter ones can be hard in the age of internet purchases was wondering if anyone recommends them or are you still Dormer advocates and learning to sharpen them? Yes, I've read a few posts about dormer bits, but these posts were back in 2006 / 2008, was wondering if anyones opinion of the M35 cobalt bits had improved. I've been trying to drill out some M12 10.9 bolts, and had a 1/4" bit that was doing well, until it broke as it snagged as it popped out of the bottom of the hole (I'd done about 4 out of 6 by this time). Hopefully this is not a repeat post as I did do a search before and found nothing on Cobalt bits other than Ti coated ones.Īnyone using cobalt bits? (not the coated ones, but the "solid" (alloyed) ones). ![]()
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