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frank goodnight
Joined: 27 Dec 2011
Posts: 126
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 Posted: Wed Jan 14, 2015 6:56 am Post subject: Form blocks |
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Making some form blocks and
have forgotten what angle to cut
the edges so the flanges will spring
back and end up at 90 degrees. Using
.025-- 6061T6. Would someone with
A better (younger) memory please
enlighten me. Thanks
Frank
Sent from my iPhone
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frank goodnight
Joined: 27 Dec 2011
Posts: 126
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| Posted: Wed Jan 14, 2015 7:27 am Post subject: Form blocks |
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Sent from my iPhone
On Jan 14, 2015, at 8:52 AM, Frank <frank.goodnight(at)att.net> wrote:
| Quote: | Making some form blocks and
have forgotten what angle to cut
the edges so the flanges will spring
back and end up at 90 degrees. Using
.025-- 6061T6. Would someone with
A better (younger) memory please
enlighten me. Thanks
Frank
Sent from my iPhone
|
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http://www.matronics.com/Navigator?Kolb-List |
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sat Jan 17, 2015 7:42 am Post subject: Form blocks |
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Frank, For the life of me I cannot find the little book on calculating spring back that I was given when I worked in the Cessna tooling machine shop years ago. My gut says that you need 4 degrees of compensation, but without my spring back and bend allowance book. I did find this:
http://www.custompartnet.com/calculator/bending-springback
Using their calculator it comes out to 2.3 degrees
Rick Girard
do not archive
On Wed, Jan 14, 2015 at 8:52 AM, Frank <frank.goodnight(at)att.net (frank.goodnight(at)att.net)> wrote:
| Quote: | --> Kolb-List message posted by: Frank <frank.goodnight(at)att.net (frank.goodnight(at)att.net)>
Making some form blocks and
have forgotten what angle to cut
the edges so the flanges will spring
back and end up at 90 degrees. Using
.025-- 6061T6. Would someone with
A better (younger) memory please
enlighten me. Thanks
Frank
Sent from my iPhone
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sat Jan 17, 2015 4:35 pm Post subject: Re: Form blocks |
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From Tony Bingelis' book "Sportplane Construction Techniques."
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Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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frank goodnight
Joined: 27 Dec 2011
Posts: 126
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| Posted: Wed Jan 21, 2015 8:25 am Post subject: Form blocks |
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Thanks Richard,
I seem to remember seething about
7degrees.gues I will know soon as I cut one.
Frank
Sent from my iPhone
On Jan 17, 2015, at 9:41 AM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:
[quote]Frank, For the life of me I cannot find the little book on calculating spring back that I was given when I worked in the Cessna tooling machine shop years ago. My gut says that you need 4 degrees of compensation, but without my spring back and bend allowance book. I did find this:
http://www.custompartnet.com/calculator/bending-springback
Using their calculator it comes out to 2.3 degrees
Rick Girard
do not archive
On Wed, Jan 14, 2015 at 8:52 AM, Frank <frank.goodnight(at)att.net (frank.goodnight(at)att.net)> wrote:
--
Believe those who are seeking the truth, doubt those who find it.
-Andre Gide
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ctric.com
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uilthelp.com
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otstore.com
matronics.com/contribution
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cs.com
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