The Murphy Builders Site

Hi Guys,

I hope those with projects are making progress.
Randy and I push a little closer to flight every day.

It's time to make holes in the firewall.
Any tips for coping with the stainless steel?

And while I'm at it, there is a need to route fuel lines, hydraulic lines,
electrical wire etc. Holes need to be drilled. I have not come across any
real guidance in the manual.
What are the accepted rules of the road in drilling holes in structure to
accommodate routing of whatever.

Oh, and how about making the access holes and covers in the floor?
Guidelines?



Thanks in advance.

Regards,
Don Boardman
& Partner, Randy Bowers
Super Moose #130 M-14PF 400HP, MT-prop, Aerocet 3500 amphibs, Rome, NY




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In a message dated 3/2/03 6:44:35 PM Central Standard Time,
dboardm3@twcny.rr.com writes:

And while I'm at it, there is a need to route fuel lines, hydraulic lines,
electrical wire etc. Holes need to be drilled. I have not come across any
real guidance in the manual.
What are the accepted rules of the road in drilling holes in structure to
accommodate routing of whatever.

DON
There are some real nice two piece eyeball type fittings for the control
cables. That rotate to just about any angle needed till you tighten them
down. Holes for wiring and tubing drill as needed for a grommet to prevent
chafing and use fire caulk to cover and seal. If you check the specs between
the approved fire caulk sold buy Aircraft Spruce or any of the other parts
suppliers and the commercial fire caulk used in construction the specs are
the same, but the price is (way cheaper). I've drilled through SS with
everything from standard bits to hole saws and wood bits. The paddle style
wood bits with the points on the out side of the bit just slowly scratch
there way through. And you can take a file to them to sharpen the outside
points.
Phil&Lisa Smith
#460R
N414D



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Hey Don,

Unibit step drills work a treat. MUCH better than a regular drill bit
in thin materials. I don't know where you are located, but lots of
hardware and tool supply houses have them. Quite a variety too. Some
will go from about 3/16 to 3/4 in many steps, and some will only do 4
or 5 hole sizes. Check around. If you don't get anything, shout
again, and I'll get part numbers.
For stainless steel, the trick is to keep the drill cutting. If it is
allowed to spin against the metal without cutting, even for a fraction
of a second, the metal work hardens and becomes as hard as glass, and
will be extremely hard to cut then. Just keep a constant pressure.
If you are doing a Rebel .020" firewall, then it is best to have a
helper hold a piece of wood on the opposite side for you to push
against. Do something to create a depth stop before you start to
drill, so that the hole doesn't get too big too quick!
And doublers work well around holes, and are a good idea if you are
removing much metal.

Take care. Good luck.

Brian Lawson,
Windsor, Ontario.
XXXXXXXXXXXXXXXXXXXXXXXXXXXX
On Sun, 02 Mar 2003 19:44:27 -0500, you wrote:

Hi Guys,

I hope those with projects are making progress.
Randy and I push a little closer to flight every day.

It's time to make holes in the firewall.
Any tips for coping with the stainless steel?

And while I'm at it, there is a need to route fuel lines, hydraulic

lines,

electrical wire etc. Holes need to be drilled. I have not come across

any

real guidance in the manual.
What are the accepted rules of the road in drilling holes in structure

to

accommodate routing of whatever.

Oh, and how about making the access holes and covers in the floor?
Guidelines?



Thanks in advance.

Regards,
Don Boardman
& Partner, Randy Bowers
Super Moose #130 M-14PF 400HP, MT-prop, Aerocet 3500 amphibs, Rome, NY




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Here's one option for wire penetrations.
http://www.aeroelectric.com/articles/Fi ... ewall.html
Ken

And while I'm at it, there is a need to route fuel lines, hydraulic lines,
electrical wire etc. Holes need to be drilled. I have not come across any
real guidance in the manual.
What are the accepted rules of the road in drilling holes in structure to
accommodate routing of whatever.

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