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  #1  
Old 09-01-2013, 09:35 AM
JimMac JimMac is offline
 
Join Date: Jun 2012
Location: Madison, AL
Posts: 67
Default Counter-sink angle for CS4-4 rivets

The RV-12 instructions for assembing the roll bar states to machine counter-sink the top roll bar rivet holes for CS4-4 rivets. No mention is made about this counter-sink being 100 deg or 120 deg. Should I ALWAYS use 120 deg for CS-4 rivets? I remember some places in the wing construction where it DID specify 120 deg for the counter-sink for some CS4 rivets.
Thanks in advance for any help.
JimMac
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  #2  
Old 09-01-2013, 02:30 PM
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JanRV6UK JanRV6UK is offline
 
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Location: England
Posts: 470
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flush pop rivets .. like the CS4-4 are 120deg ...
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  #3  
Old 09-01-2013, 07:33 PM
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bhassel bhassel is offline
 
Join Date: Jan 2005
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I made a mistake in the emp where I used 100 degree versus the 120 degree for the CS-4s. I got a little worried and contacted the factory. They stated 'CS-4s always need a 120 degree countersink'.

In my case, at that point, for what I was doing, (any more prepositions I can fit in there?) it was mostly a cosmetic concern. I bought a full countersink set to use on the remainder.

Bob
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Last edited by bhassel : 09-02-2013 at 08:36 AM.
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  #4  
Old 09-01-2013, 08:03 PM
DaveWelch DaveWelch is offline
 
Join Date: Mar 2005
Location: Huntsville, AL
Posts: 427
Default 120 degree C-sink

Quote:
Originally Posted by JimMac View Post
The RV-12 instructions for assembing the roll bar states to machine counter-sink the top roll bar rivet holes for CS4-4 rivets. No mention is made about this counter-sink being 100 deg or 120 deg. Should I ALWAYS use 120 deg for CS-4 rivets? I remember some places in the wing construction where it DID specify 120 deg for the counter-sink for some CS4 rivets.
Thanks in advance for any help.
JimMac
Jim, I've got one you can borrow while waiting for yours. Send me a PM if interested. Good excuse to meet up at last!
Dave
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