- Thread starter Edward Teach
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Below 3mm I use a microscope.
I bought a pack of carbide regrinds in 0.8mm I can't even really see the point'y bit with a jewelers loop , god only knows how they get re groundBelow 3mm I'd need the Hubble telescope
Stu
My anti pandemic jab was bigger than that.I bought a pack of carbide regrinds in 0.8mm I can't even really see the point'y bit with a jewelers loop , god only knows how they get re ground
Stu
mtt.tr
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ah mate easy id do that with my angle grinderI bought a pack of carbide regrinds in 0.8mm I can't even really see the point'y bit with a jewelers loop , god only knows how they get re ground
Stu
James1979
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I can’t do that, but I have clamped an angry grinder in a vice as a “get you home” last resort.When pressed - by hand, with an angle grinder
Case in point, we were on a job in Gosport some years back and we'd roped in assorted teenagers to help out with menial tasks like lugging stuff.
Someone gave them the job of drilling holes in a concrete floor to put Rawlbolts in, using big SDS masonry bits and a hefty Bosch hammer-action. Once that was done, it was realised that all the steel fixtures they were to bolt down needed bigger holes in, so a 16mm drill bit was obtained and they set to it. I should point out that I was busy elsewhere for most of the day, and when I got back to the site the lads were all sat round twiddling their thumbs while the so-called 'project manager' grinned like a Cheshire cat and said the job was knackered.
Why? I asked.
Because the 16mm drill lasted seconds before 'going blunt'. So off they'd trooped (all of them!) to the local tool shop where another 16mm drill was obtained.
Same thing happened: drill was blunt in no time. Back to the shop. Repeat until the shop had no more 16mm drills, but the lads had a pile of shagged ones.
I looked at the drills, said all we needed to do was resharpen them.
Project manager gets all shirty, where's our tool grinder, how can we do this on site etc. etc.
I pointed at the 4.5" angle grinder and said "There's always that".
Well now project manager is on the floor: you can't sharpen drill bits with an angle grinder, he chortles to the young lads.
I picked up the grinder and a drill, put some semblance of a shape on it and handed it to one of the teenagers: show me what you were doing, I tell him.
So he fits the drill, pulls the trigger and the big Bosch spins straight up to warp speed as he applies it to the first bit of steel.
I stopped him, turned the speed control right down and told him to try again. Predictably, the drill went straight through.
I reshaped all the other 16mm drills but I don't think they neded to swap more than once for the rest of the job.
The 'project manager', by the way, had some sort of Degree in engineering.
Mick Annick
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I never could get the hang of it, so I bought a drill doctor instead, now every drill I could find is sharp again
Which one do you have? I keep looking them but struggling to justify the cost - do I buy one or a bench grinder? I have neither at present.
James1979
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Bench grinder. At least you can use that for other things, and if you learn to do it on a bench grinder you can do it wherever
Ive had a bench grinder for years, but could never get the hang of grinding drills, I only ever use the grinder for sharpening tungstens really.
The Drill doctor is expensive but tbh I’ve forgotten what it cost, and I am always using sharp drills
Feet 'n Inches
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That reminds me of a comment from a drill sergeant.Below 3mm I use a microscope.
"Did you shave this morning?"
"Yes Sergeant"
"Did you use a mirror?"
"Yes Sergeant"
"Next time use a flaming razor!"
for productivity I bought a drill doctor, and do them in bulk. I have a can at the side of the drill press, and when it's full, I'll set up the Dr and do a bulk sharpen.
That said when I have one or two to dress up, I just use the bench grinder. OK we had it drummed into us as apprentices, but even then I honestly don't know why so many people see it as difficult. It's pretty easy really, and little force / effort is needed. For the most part you're only sharpening them (so not removing much at all) and not reshaping a whole new edge... so unless the bit is completely fubar'd you're just following lightly the existing shape. Don't let them over heat so plenty of dips in the water to cool them, and lightly on the stone, let it do the work.
it's like most things, it's just practice. An hour with a box of drills in front of a bench grinder, and you'll soon get the hang of it, it's not magic.... if I can do it, anyone can.
Maybe before you start have a look on google, at how drill bits are shaped, cttting angles, split points etc etc, so you can see what you're trying to replicate, then have a go...
That said when I have one or two to dress up, I just use the bench grinder. OK we had it drummed into us as apprentices, but even then I honestly don't know why so many people see it as difficult. It's pretty easy really, and little force / effort is needed. For the most part you're only sharpening them (so not removing much at all) and not reshaping a whole new edge... so unless the bit is completely fubar'd you're just following lightly the existing shape. Don't let them over heat so plenty of dips in the water to cool them, and lightly on the stone, let it do the work.
it's like most things, it's just practice. An hour with a box of drills in front of a bench grinder, and you'll soon get the hang of it, it's not magic.... if I can do it, anyone can.
Maybe before you start have a look on google, at how drill bits are shaped, cttting angles, split points etc etc, so you can see what you're trying to replicate, then have a go...
I bought one of these for 250 and they actually work really really well if you have cobalt split point drills etc .. all metal.. no plastic and uses collets instead the silly chucks most drill bit sharpeners have.
you can actually create split points on this as well not just regrind them https://www.amazon.co.uk/Huanyu-Hig...rpener+machine+13b&qid=1616802927&sr=8-2&th=1
you can actually create split points on this as well not just regrind them https://www.amazon.co.uk/Huanyu-Hig...rpener+machine+13b&qid=1616802927&sr=8-2&th=1
northwest
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This is the same machine: https://www.chronos.ltd.uk/product/pp-13c-expert-drill-sharpening-machine-3-13-mm/ but £150 cheaper. I bought mine for a little over 200, it pays to shop around. There was an ebay seller and I just called them up and bought direct at a good discount.
I never could get the hang of it, so I bought a drill doctor instead, now every drill I could find is sharp again
I had the hang of it for years, but finally succumbed to the bedside manner of the Drill Doctor. I'm impressed, like you I spent a pleasurable hour sharpening even odd sizes of imperial drills I use maybe once a year!
