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jgreen_sg(at)yahoo.com
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 Posted: Tue Jan 02, 2007 4:18 pm Post subject: Re deburing before dimpling |
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Thanks for the input. The author of the Standard
Aircraft Handbook wrote this book before RVs were even
a twinkle in Van's eye. As I understand it he is not
talking about prepunched kits or any other kind of
kit. By predrilled he just means holes drilled before
any other preparation of the metal.
The part that I am interested in is that he says 'do
not debur if you plan to dimple'. Sure would save a
ton of time on the fuselage.
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rv7(at)b4.ca
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| Posted: Tue Jan 02, 2007 4:46 pm Post subject: Re deburing before dimpling |
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On 16:17 2007-01-02 jim green <jgreen_sg(at)yahoo.com> wrote:
| Quote: |
The part that I am interested in is that he says 'do
not debur if you plan to dimple'. Sure would save a
ton of time on the fuselage.
|
It would be really, really, interesting to hear what his reasons were for
that instruction. Especially if he's referring to metalworking when you
have no pre-punched hole to work with. Drilling a hole from scratch in a
piece of sheet aluminum is almost guaranteed to leave a burr.
I found when working on the Vertical Stab that the pre-punched holes didn't
leave much if any burr when they were drilled out, but the ribs and forward
spar (which weren't pre-punched on my early -7 kit) left a measurable burr
when the holes were drilled.
I deburred both before dimpling by running a scotchbrite pad down the
surfaces. It smoothed off all the holes quite nicely, with very little
concern of accidentally "chamfering" the holes.
-Rob
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rv7(at)b4.ca
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| Posted: Tue Jan 02, 2007 4:46 pm Post subject: Re deburing before dimpling |
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On 16:17 2007-01-02 jim green <jgreen_sg(at)yahoo.com> wrote:
| Quote: |
The part that I am interested in is that he says 'do
not debur if you plan to dimple'. Sure would save a
ton of time on the fuselage.
|
It would be really, really, interesting to hear what his reasons were for
that instruction. Especially if he's referring to metalworking when you
have no pre-punched hole to work with. Drilling a hole from scratch in a
piece of sheet aluminum is almost guaranteed to leave a burr.
I found when working on the Vertical Stab that the pre-punched holes didn't
leave much if any burr when they were drilled out, but the ribs and forward
spar (which weren't pre-punched on my early -7 kit) left a measurable burr
when the holes were drilled.
I deburred both before dimpling by running a scotchbrite pad down the
surfaces. It smoothed off all the holes quite nicely, with very little
concern of accidentally "chamfering" the holes.
-Rob
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dan.beadle(at)inclinesoft
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| Posted: Wed Jan 03, 2007 8:09 am Post subject: Re deburing before dimpling |
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I suspect that punching leaves more stress in the aluminum than drilling.
The match drilling and deburring relieves that stress prior to dimpling
(which probably leaves more stress).
So, for me, drill, deburr is still the way to go. Even with that, matched
hole saves a ton of time.
Dan
--
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