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20-11-2016 #11
I can definitely help here but have to be later tonight, off out now but soft alloy can be thru drilled without a burr on either side.
John S -
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20-11-2016 #12
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Being Santa, a 7 and 10 year old - both girls....sorry!? lol
I've had the same problem, I'm actually after a countersink/chamfering bit recommendation please if anyone has got one to give.
I end up using a drill bit way bigger than the hole, just give it a quick turn by hand, works quite well on smaller holes, tried a few off ebay all seem to be crap, blunt or for wood.
Was thinking of adding a "Hand Tool" section to the forums so could split it, Metal Finishing Techniques may be a better place for your question though.Last edited by Lee Roberts; 26-11-2016 at 11:55 AM.
.Me
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26-11-2016 #14
Hi Rob
If i have to drill plate, i don't use a standard grind drill. i grind the size required flat bottom, then relieve it to leave a point in the centre(like a wood drill) this trapanes the hole and breaks through relatively clean, a bit off pecking might help.
regards
Mike
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26-11-2016 #15
I haven't got the skill or patience to do regrinding of small drills !
What I am using is a 3.05 carbide drill from this guy http://www.circuit2u.co.uk/epages/63...rill%20Bits%22 He supplies 1st regrind bits at a good price. I am pecking the hole, but am going to play around with the peck and spindle speeds to see what happens.
Cheers,
Rob
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26-11-2016 #16
380 holes per piece ! and 20 pieces to do ! sod hand chamfering for a game of soldiers ! I'd end up screaming barmy (nearly there anyway). Here's the dxf, so you can see what I mean STUPLATEb.dxf
Cheers,
Rob
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26-11-2016 #17
Rob
If you have a compressor you try a soft abrasive http://www.ebay.co.uk/itm/ECOSTRIP-C...K3a1K2gRapthiA i use this for cleaning Spilka hinges when doing refurb. it might remove the sharp edges.
Mike
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