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Old 03-20-2017, 04:37 PM
fr0gpil0t fr0gpil0t is offline
Join Date: Apr 2013
Location: phoenix
Posts: 33
Default Marring to pop rivets

Would appreciate some advice here. I noticed using a hydraulic rivet puller I was getting a lot of marring on the pop rivet head. After grinding the rivet puller nose smooth because the hole was not very clean I didn't get much improvement. I bought a new puller which has a better sized nose piece for the LP4 rivets. Rivets are much improved but still some marring. I tried reducing the air pressure, moving the black barrels inside the rivet forward. Is there a trick I'm missing.

This old thread was my starting point

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Old 03-20-2017, 05:36 PM
bobnoffs bobnoffs is offline
Join Date: Jul 2012
Location: n. wi
Posts: 486

fwiw i made new ''tips'' for my riveter i think i started with a coarse thread 1/4'' bolt. i made the hole as small as i could because the rivets were ''flowing'' up into the hole. made a big difference. i think i heat treated to straw color.
Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying
RV-12 kit as of 9/13
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Old 03-20-2017, 05:52 PM
sf3543 sf3543 is offline
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 896

Just put a piece of masking tape over the tip and there won't be any more marring. Maybe two pieces of tape and you won't have to replace it as often.
Just put the tape on the nose of the puller and punch the hole with the first rivet mandrel.
Steve Formhals
RV6, RV8 (2), RV12 & RV3 about 2/3 done.
A&P, Tech Counselor & Flight Advisor
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Old 03-21-2017, 03:49 AM
mike newall's Avatar
mike newall mike newall is offline
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 1,593

Had the same to begin with and as mentioned it is the head pulling up into the mandrel.

Get the tip size that is too small and drill out so it just clears the mandrel. Polish the tip on a unitised wheel or similar and you should be fine.

Oh - and get one of the angle device jibbers from Cleaveland - they are absolutely essential for close in rivets
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

Donated twice in 2017
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Old 03-22-2017, 05:29 PM
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johnbright johnbright is offline
Join Date: Aug 2010
Location: Newport News, Va
Posts: 171
Default draw burr

I was getting not marring but a draw burr... the rivet head material would pull into the gap between the puller hole and the rivet nail. A piece of aluminum with a hole to fit the nail fixes the problem and when you use it it gets a little mashed so the hole gets tighter rather than looser.

Also I ground material from the puller for corner clearance.

John Bright, RV-6A 25088, at FWF
O-360, 8.5:1, vert sump, SDSEFI EM-5
Z-14 adapted for EFI, wiring and IP CAD files here
Newport News, Va
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Old 03-24-2017, 10:57 AM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,202

The only time I got a draw burr was when I mistakenly used a nose piece designed for the shank of a 3/16" pulled rivet on an LP4-3.
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Old 03-24-2017, 11:06 AM
DHeal DHeal is offline
Join Date: Sep 2006
Location: Windsor, California
Posts: 672

IMHO, as long as the "marring" is not structurally compromising the strength of the rivet head, don't worry about the "cosmetic" aspect. Your paint prep and final paint coats will easily cover any cosmetic blemishes. Do try to fit the rivet-puller nosepiece to closely match the rivet mandrel to minimize the potential for marring, but don't obsess about it.
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 635+ hours (as of May 2018)!
VAF donation through June 2018.
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