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Deep hole "D" bit advice needed.

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mark costello 1	05/03/2020 14:37:57
800 forum posts 16 photos	He's worth too much money and a good friend.
HOWARDT	05/03/2020 15:14:33
1081 forum posts 39 photos	May be more expense than you want, but what about a gun drill. Used to have a lot of holes gun drilled in the past for hydraulic and pneumatic pathways. How about discussing with a tool manufacturer such as Guhring.
Neil Wyatt	05/03/2020 20:32:30
19226 forum posts 749 photos 86 articles	D-bit will work fine, use a 13" length of silver steel and 'waist' it so you just have about 20mm of d-bit at the end. You could round the corners slightly to ease the job. Neil
Hopper	05/03/2020 23:05:37
7881 forum posts 397 photos	Posted by mark costello 1 on 24/02/2020 16:45:33: I have a job that comes up every year or two for a Customer. He needs a 1/2" hole 10"-12" deep in Aluminum. He wants no mismatch in the middle. I get a thousand or two when drilling from both ends. A thousandth or two? I still can't see why this could not be polished out with a flapper of coarse emery tape on the end of a piece of wooden dowel spun in pistol drill at high revs. A thousandth or two in aluminium should disappear in a matter of seconds. A minute at most. If it takes longer, use coarser emery paper. Edited By Hopper on 05/03/2020 23:06:30
ron vale 1	22/03/2020 18:56:30
50 forum posts 5 photos	Daft Question , what does he do with the previous one? If he only wants it once every year what does he do to total it every year
mark costello 1	23/03/2020 16:44:53
800 forum posts 16 photos	Don't know, might be ham handed. Just gleefully cash the check.

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