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1. 11:00 AM - Re: Re: For Sale: 5/16 in Ream (FLYaDIVE)
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| Subject: | Re: For Sale: 5/16 in Ream |
Geoff:
Very good advise all around.
Barry
Machinist with all my fingers, toes and eyes (40 years).
On Thu, Jul 1, 2010 at 5:02 PM, Geoff Heap <stol10@comcast.net> wrote:
>
> Doug I know nothing of the 601 mod. I'm building a 701. However.
> Standard practice would be to drill 1/64" under size before reaming. If you are
working with sheet metal though, do not drill to this size. Unless the hole
is around 1/8" or smaller you cannot just drill the sheet metal to size. the
hole will be disgusting and certainly not round, depending on the sheet metal
thickness. Please buy a few #1 center drills. They are 1/8" dia. and dirt cheap
and you can make a couple of 601's with just a half dozen. You can center punch
first and then drill straight through thin sheet metal with these. Then open
the hole up with a step drill to 1/64" under the ream size. Then ream to size.
But, But, But,But.
> When possible use a drill press. DO NOT HOLD THE PART WITH YOUR HANDS or you
will soon have no hands. Sandwich the part if you can. Put a piece of scrap wood
on the sheet metal and clamp on the wood. You will get a much nicer hole. I
have lots of reamers and I use them to slowly work up to the size I want or I
will use a step drill.....Geoff
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=303369#303369
>
>
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