reamer fits

[Jason Beall]

Hi all,

Well, last night I toasted my W505, W506, and W507
wing attach brackets on my SR wing spar trying to ream
the 7/16" hole. I drilled a hole 1/32 undersize, and
then preceeded to ream the hole with the slowest
possible speed (650 rpm) my drill press will turn at.
The result: an irregular hole full of 'chatter' marks.
Anyone else have any better techniques? Now that the
three straps are toast, I plan on using them to
practice on. As an aside, I drilled a perfect 7/16"
hole with a standard high quality, cobalt, 135 degree
split point drill bit. The AN7 bolt fit very snuggly
in it...in fact I had to carefully give it a push into
the hole. I'm temped just to drill the holes with a
standard drill bit in my drill-press.

Anyone else have good/bad luck with reamers?

-Jason

=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

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[neil f humphrey]

Jason,
My standard machists manual says that the hole must be within 0.007in of
final size before reaming, to get a good quality hole . Also I have always
reamed by hand. This seems to give good results. If I am worried about
straightness of the holes I hand turn the reamer in my drill press.

cheers,

On Thursday 11 October 2001 08:20 am, you wrote:

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Hi all,

Well, last night I toasted my W505, W506, and W507
wing attach brackets on my SR wing spar trying to ream
the 7/16" hole. I drilled a hole 1/32 undersize, and
then preceeded to ream the hole with the slowest
etc

_____________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
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--
Neil Humphrey

http://faculty.gg.uwyo.edu/neil (under construction, as usual)



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[Mike Kimball]

Couldn't get reamers to work either. I just used drill bits for my holes.

Mike Kimball
SR#044

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Jason Beall
Sent: Thursday, October 11, 2001 6:20 AM
To: murphy-rebel@dcsol.com
Subject: reamer fits


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Hi all,

Well, last night I toasted my W505, W506, and W507
wing attach brackets on my SR wing spar trying to ream
the 7/16" hole. I drilled a hole 1/32 undersize, and
then preceeded to ream the hole with the slowest
possible speed (650 rpm) my drill press will turn at.
The result: an irregular hole full of 'chatter' marks.
Anyone else have any better techniques? Now that the
three straps are toast, I plan on using them to
practice on. As an aside, I drilled a perfect 7/16"
hole with a standard high quality, cobalt, 135 degree
split point drill bit. The AN7 bolt fit very snuggly
in it...in fact I had to carefully give it a push into
the hole. I'm temped just to drill the holes with a
standard drill bit in my drill-press.

Anyone else have good/bad luck with reamers?

-Jason

=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
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Make a great connection at Yahoo! Personals.
http://personals.yahoo.com
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[C&P Kucera]

Hi Jason,

your speed was OK maybe a tad fast, 600 rpm would be better (ref Machinery
Handbook). Hole should be drilled about 5 to max. 10 thou undersize (need
number or letter drills). Add cutting oil and feed slow.
Bolt tolerances vary so one can luck out getting a snug fit with just a
drill bit. I ended up using expansion reamers.
www.KBCTools.com have it all at reasonable cost and near instant delivery.

Paul Kucera

453R

----- Original Message -----
From: "Jason Beall" <super_rebel131@yahoo.com>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, October 11, 2001 10:20 AM
Subject: reamer fits


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Hi all,

Well, last night I toasted my W505, W506, and W507
wing attach brackets on my SR wing spar trying to ream
the 7/16" hole. I drilled a hole 1/32 undersize, and
then preceeded to ream the hole with the slowest
possible speed (650 rpm) my drill press will turn at.
The result: an irregular hole full of 'chatter' marks.
Anyone else have any better techniques? Now that the
three straps are toast, I plan on using them to
practice on. As an aside, I drilled a perfect 7/16"
hole with a standard high quality, cobalt, 135 degree
split point drill bit. The AN7 bolt fit very snuggly
in it...in fact I had to carefully give it a push into
the hole. I'm temped just to drill the holes with a
standard drill bit in my drill-press.

Anyone else have good/bad luck with reamers?

-Jason

=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
Do You Yahoo!?
Make a great connection at Yahoo! Personals.
http://personals.yahoo.com

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[Jason Beall]

Hi Neil and all that replied,

That's exactly what I did. I opened up the top of my
drill press, took the drive belt off, and turned the
pulley by hand. The result - a nice clean hole. Funny
enough, the hole is the same size as the one drilled
in scrap with a 7/16" drill bit. Maybe a few thou
tighter with the reamer...but barely.

Thanks all,

-Jason

--- neil f humphrey <neil@uwyo.edu> wrote:
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Jason,
My standard machists manual says that the hole must
be within 0.007in of
final size before reaming, to get a good quality
hole . Also I have always
reamed by hand. This seems to give good results.
If I am worried about
straightness of the holes I hand turn the reamer in
my drill press.

cheers,

On Thursday 11 October 2001 08:20 am, you wrote:

*-------------------------------------------------------------------------*

The list archives are located at:
http://www.dcsol.com:81/public/default.htm
username: rebel password: builder

*-------------------------------------------------------------------------*

Hi all,

Well, last night I toasted my W505, W506, and W507
wing attach brackets on my SR wing spar trying to

ream

the 7/16" hole. I drilled a hole 1/32 undersize,

and

then preceeded to ream the hole with the slowest
etc

_____________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
Do You Yahoo!?
Make a great connection at Yahoo! Personals.
http://personals.yahoo.com

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--
Neil Humphrey

http://faculty.gg.uwyo.edu/neil (under
construction, as usual)

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=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
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Make a great connection at Yahoo! Personals.
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[toddedgar]

I drilled them out also with a drill bit. I talked to Grant at MAM and asked
him why it didn't mention reaming them out as was with the SR2500. He said
that the bolts were overkill in the strength department to compensate for
people modifying an already built aircraft. Therefore, the thought was that
it would be to difficult to get a perfecct hole so they therefore went up to a
much larger and stronger bolt to compensate for this. Grant recommended to me
that I drill them out with the correct size drill bit and not to ream them out.

The same goes with the the new machine fittings that are used on the front
spar for the new attachment fittings. You don't have to ream them out.
However, when you drill the holes out in increments to the final size, make
sure your hole is perfectly straight. It is very easy to drill the hole off
center and because the thickness is so great, you can end up with a hole that
is elongated at the other end.



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