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Jaybannist(at)cs.com
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 Posted: Sat Jan 13, 2007 6:10 pm Post subject: Indexing a row of holes |
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Listers,
I am in the process of making a sub-panel for my circuit breakers. The circuit breakers need to be located 20mm on center. Therefore, I need to drill holes in the sub-panel at 20mm O.C.; and I also need to drill holes in a .032 x 1/2" copper bus bar (fastened to the back side of the circuit breakers)at 20mm O.C. I will have two rows of circuit breakers, eight in each row. I don't feel that I can just mark them with a sharpie and get the accuracy I want. Does anyone have any method for accurately indexing holes like this?
Jay in Dallas
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craig(at)craigandjean.com
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| Posted: Sat Jan 13, 2007 7:11 pm Post subject: Indexing a row of holes |
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Lay out a 1-to-1 pattern in a CAD program, print it at 100% and stick it to
the metal with 3M spray adhesive. Use the weakest adhesive, not the
permanent stuff.
Or: stack the buss bars and panel and drill pilot holes in all three at the
same time. Just make sure to mark the pieces so you can put them together in
the same orientation.
BTW: if you haven't already, read Bob Nuckolls stuff on the AeroElectric
list and his book.
-- Craig
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naumuk(at)alltel.net
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| Posted: Sat Jan 13, 2007 8:56 pm Post subject: Indexing a row of holes |
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Jay-
Ideally, use a Bridgeport vertical mill. Other than that, use an
ultra-fine point Sharpie and a "Clicker" center punch.
Bill Naumuk
HDS Fuselage
Townville, Pa
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naumuk(at)alltel.net
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| Posted: Sun Jan 14, 2007 9:12 am Post subject: Indexing a row of holes |
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Jay-
I forgot about an old layout trick.
Draw a line with a fine Sharpie from one end hole to another. Center
punch one end hole. Then set a draftsman's compass with two points (No lead)
to 20mm, stick one point in the first punch hole and swing an arc across the
Sharpie line. You can then leapfrog your way to the second end hole. If you
wind up with the last arc right on the second end hole, go back and center
punch the scribed intersections. You won't be off more than a couple thou
total, and everything will be evenly spaced.
do not archive
Bill Naumuk
HDS Fuselage
Townville, Pa
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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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| Posted: Sun Jan 14, 2007 9:49 am Post subject: Re: Indexing a row of holes |
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What about using a rivet fan? Set it up and drill all the items one after another to insure the fan doesn't shift. You might drill the pilot holes in the bus first and use it as a drilling template for the panel.
Tim
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Jaybannist(at)cs.com
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| Posted: Sun Jan 14, 2007 11:13 am Post subject: Indexing a row of holes |
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Bill,
It seems that I was overly concerned about accuracy. I simply used a scale and marked off 20mm increments, centerpunched and drilled pilot holes. I drilled three stacked bus bars at the same time and use one of the bus bars as a template to drill pilot holes in the sub panel. I test fitted several circuit breakers and it works out just fine.
Thanks - Jay in Dallas
Do not archive
"Bill Naumuk" <naumuk(at)alltel.net> wrote:
[quote]
Jay-
I forgot about an old layout trick.
Draw a line with a fine Sharpie from one end hole to another. Center
punch one end hole. Then set a draftsman's compass with two points (No lead)
to 20mm, stick one point in the first punch hole and swing an arc across the
Sharpie line. You can then leapfrog your way to the second end hole. If you
wind up with the last arc right on the second end hole, go back and center
punch the scribed intersections. You won't be off more than a couple thou
total, and everything will be evenly spaced.
do not archive
Bill Naumuk
HDS Fuselage
Townville, Pa
---
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naumuk(at)alltel.net
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| Posted: Mon Jan 15, 2007 3:26 pm Post subject: Indexing a row of holes |
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Jay-
Glad everything worked out.
Bill Naumuk
HDS Fuselage
Townville, Pa
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