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Carlos Sa
Joined: 13 Jan 2006
Posts: 96
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 Posted: Tue Apr 25, 2006 4:38 pm Post subject: RE : Re: holes, drill bits, reamers and bolts |
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Just a clarification: I am not quite sure I have a problem.
I was just surprised that both, the reamer hole and the regular (not reamed) hole are both 0.375"
(give or take 0.001" due to measurement error).
I was expecting the non-reamed hole to be larger...
Thanks much for all the replies
Carlos
Lche-vitrine ou lche-cran ?
magasinage.yahoo.ca
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CH601-HD, plans
Montreal, Canada |
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Geoff Heap
Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey
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| Posted: Wed Apr 26, 2006 3:42 am Post subject: Re: RE : Re: holes, drill bits, reamers and bolts |
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Carlos. What you just said does not make sense. The non reamed hole (drilled hole) is supposed to be smaller. ie .365 /.370. The reamer opens it up to the final dia. of .375. If your drill (probablly .368) is making the hole .375 then you need to use a smaller drill. I saw the earlier replies to your problem commenting on the use of a letter "U" drill for a .375 final hole size and I decided to stay out of that. However, let me say this now please. Due to too many complications to get into here, you usually cannot get a .368 drill to drill a .368 hole outside of a milling machine. On a small pedestal drill press you will have trouble. You should be using a 23/64 drill (.359). The reamer does more than produce the final dia. It gets rid of the rough walls created by the drill and makes the hole perfectly round and smooth walled. A .375 hole created by a .368 is not a NICE hole and it most certainly is not round.
See you up there.....Geoff.
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