Today's Message Index:
----------------------
1. 09:42 AM - Zenith Banquet (Joe)
2. 03:17 PM - Drilling aluminum (Donald Lynam)
3. 03:40 PM - Re: Drilling aluminum (Thruster87)
4. 03:42 PM - Re: Drilling aluminum (Jay Bannister)
5. 07:19 PM - Re: Drilling aluminum (Mark Hubelbank)
Message 1
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Zenith Banquet for Oshkosh EAA 2012
The Oshkosh Experimental Aircraft Convention is less than 4 weeks away! It's
time to make plans to attend the Zenith Builder's Banquet for 2012. The
Zenith Banquet for this year's convention will be held at Robbins Supper
Club, 1810 Omro Road, in Oshkosh, on Thursday, July 26th. Wally at Robbins
has been proud to have the opportunity to serve the builders of Zenith
aircraft at Oshkosh for many years.
Once again the menu will be incredible as usual. Slow roasted prime rib,
smoked BBQ ribs, herb baked chicken, Grouper with lemon butter sauce, and
all the extras that make Robbins one of the finest supper clubs in Oshkosh.
The price of the banquet will be $20 per person. you can register at the
Zenith display during the Oshkosh EAA convention. There is some major road
construction in Oshkosh at the present time and the Highway 21 exit for
Robbins may be closed. If you stop by the Zenith exhibit at Oshkosh, you can
pick up a brochure with the directions for Robbins along with banquet
information, and the bus times and route for the Oshkosh transit system
showing the Oshkosh downtown and college RSVP required at the Zenith booth
by Thursday noon. Space is limited and we've filled up the banquet room the
past few years so please be sure to RSVP early.
Message 2
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| Subject: | Drilling aluminum |
Hey Anyone=2C
I know this is really a basic question=2C but I am constantly worrying abou
t the shape of holes that I
drill in the various aluminum structures and skin of my 601 with a hand-hel
d
drill. I have tried everything I can think of (4 different drills=2C new bi
ts=2C
backing up with wood block=2C different bit speeds) and I still get slightl
y oval
holes about 50% of the time. Am I worrying about nothing=2C is this just SO
P when
hand drilling a soft metal?
Thanks for sharing your experiences.
Don Lynam
601 XL
Message 3
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| Subject: | Re: Drilling aluminum |
[quote="donaldlynam(at)hotmail.co"]Hey Anyone,
I know this is really a basic question, but I am constantly worrying about the
shape of holes that I drill in the various aluminum structures and skin of my
601 with a hand-held drill. I have tried everything I can think of (4 different
drills, new bits, backing up with wood block, different bit speeds) and I still
get slightly oval holes about 50% of the time. Am I worrying about nothing,
is this just SOP when hand drilling a soft metal?
Thanks for sharing your experiences.
Don Lynam
601 XL
> [b]
Don't get too concerned with the drilling process just de-burr everything.[Drilling
is much more critical in pressurized aircraft which yours is not] Cheers
[retired aircraft mech.]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=376873#376873
Message 4
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| Subject: | Re: Drilling aluminum |
Don,
It has been known for a long time that you can't drill perfectly round hole
s in thin aluminum with common twist drill bits, but that is not a problem.
Since designers have known this for so long, their calculations for rivet
and bolt size and spacing take this into account. Most of the rivet and
small bolts are used in compression and not in shear anyway and the Avex ri
vets we use do a good job of filling the holes once they are pulled. By th
e way, you should torque all those little AN3 bolts as they are very easily
over-torqued. When drilling thicker aluminum for closer tolerance bolts,
the only way to get a round hole is to drill it a little under sized and re
am it to the proper size. Hope this helps.
Jay
-----Original Message-----
From: Donald Lynam <donaldlynam@hotmail.com>
Sent: Fri, Jun 29, 2012 5:19 pm
Subject: Zenith601-List: Drilling aluminum
Hey Anyone,
I know this is really a basic question, but I am constantly worrying about
the shape of holes that Idrill in the various aluminum structures and skin
of my 601 with a hand-helddrill. I have tried everything I can think of (4
different drills, new bits,backing up with wood block, different bit speeds
) and I still get slightly ovalholes about 50% of the time. Am I worrying a
bout nothing, is this just SOP whenhand drilling a soft metal?
Thanks for sharing your experiences.
Don Lynam
601 XL
Message 5
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| Subject: | Re: Drilling aluminum |
Don,
For small holes, generally having a good wood backing does the
trick. For larger holes (1/4 inch and larger) a step drill works well in
thin material (0.035 in and under). Irwin makes a number of different
sizes, one is 3/16 to 7/8 in 1/16 steps for example.
On 06/29/2012 6:12 PM, Donald Lynam wrote:
>
> Hey Anyone,
>
> I know this is really a basic question, but I am constantly worrying
> about the shape of holes that I drill in the various aluminum
> structures and skin of my 601 with a hand-held drill. I have tried
> everything I can think of (4 different drills, new bits, backing up
> with wood block, different bit speeds) and I still get slightly oval
> holes about 50% of the time. Am I worrying about nothing, is this just
> SOP when hand drilling a soft metal?
>
> Thanks for sharing your experiences.
>
> Don Lynam
>
> 601 XL
>
> *
>
>
> *
--
Mark Hubelbank
NorthEast Monitoring
2 Clock Tower Place
Suite 555
Maynard, MA, 01754 - USA
mhubel@nemon.com
978-443-3955
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