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mummers
Participant

Join Date: Jan 2009
Posts: 1

Turret Punchpress - Countersinking

01/13/2009 8:41 PM

How do I determine the size of die for any particuliar

countersink? Is there a formula for this and the prepunch hole

as well? e.g. .160 hole coutersink to .320 x 82 degree, let's say .062 alum.
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55418UND
Active Contributor

Join Date: Dec 2008
Posts: 16
Good Answers: 3
#1

Re: Turret Punchpress - Countersinking

01/15/2009 7:59 AM

I'd check my " Machinery Handbook " I use them for everything. That is a good question, and it's probably in there.

My copy gets used over and over again.

Even punch press manufacturers have this information online as well. Maybe a wall chart

can be sent out from the manufacturer for all the different size c'sinks.

Hole size, mat thickness , dia of c'sink , typical set up information . Good to know where to look. All good machinists know where to look for set up information.

My Machinery Handbook is about 40 years old now, but I'd bet that information is in there.

Look up charts for punch sizes , are faster. when you find a good one...laminate it and keep it near the machine for future set ups.

I'm not going to the shop today...Too damn cold -37 degrees. That's why I'm on the computer right now. Happy punching my friend.
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DRFREON
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Join Date: Nov 2008
Posts: 158
Good Answers: 1
#3
In reply to #1

Re: Turret Punchpress - Countersinking

01/15/2009 6:01 PM

Would Starrett (spelling) have a chart?
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Ried
Guru

Join Date: Dec 2005
Posts: 1602
Good Answers: 19
#2

Re: Turret Punchpress - Countersinking

01/15/2009 9:04 AM

A number of aircraft use flush rivets and countersink the aluminum skin accordingly. Check the aircraft tool suppliers and you will probably be able to buy dies for countersink holes for various rivet sizes.

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Ried
Guru

Join Date: Dec 2005
Posts: 1602
Good Answers: 19
#4
In reply to #2

Re: Turret Punchpress - Countersinking

01/15/2009 11:26 PM

Then again maybe not. I checked this site

http://www.aircraft-tool.com/shop/search_result.aspx?CATEGORY=Dimpling+Tools

A quick glance seems to show that the angle of aircraft rivets is 100°, not 82°. Are you positive about the angle you require?

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55418UND (1); DRFREON (1); Ried (2)

Previous in Forum: Ampco 18 Alum Bronze equal?   Next in Forum: Please Help me where I got this inquiry?
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