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brass inserts - 12/20/2007 11:11:57 PM   
PylonDave



Posts: 210
Joined: 5/8/2006
From: rancho cucamonga, CA, USA
Status: offline 		I have some brass inserts on order (6/32) for the fire wall mount. one of the blind nuts poped out the back of the firewall and i don't want to cut into the fuse to fix it. Do you guys glue them in???
       Post #: 1

RE: brass inserts - 12/21/2007 1:17:06 AM   
djlyon



Posts: 1982
Joined: 12/10/2001
From: Castaic, CA, USA
Status: online 		yes

_____________________________

I never met an engine I didn't like.
Of the things I've lost I miss my mind the most.

(in reply to PylonDave)
       Post #: 2

RE: brass inserts - 12/21/2007 1:34:33 AM   
Ed Smith


 

Posts: 2851
Joined: 12/29/2001
From: Brantford, ON, CANADA
Status: offline 		I would not use those brass inserts in a plywood firewall. I used them once, never again. They will pull up tight to the back of the motor mount and then work loose in the hole, glued or not.

If you have the access may I suggest the following. Poke a piece of threaded rod through the hole in the firewall. Screw the blind nut to it. Pull the blind nut back into place. Put a washer and nut on the threaded rod and screw the blind nut into the back of the firewall. A touch of CA and it is there for good.

Ed S

(in reply to djlyon)
       Post #: 3

RE: brass inserts - 12/21/2007 1:13:26 PM   
luv to race


 

Posts: 479
Joined: 12/10/2002
From: Liquored, FL,
Status: offline 		I would second Ed's comments. Re-seat the blind nut using a long threaded rod. For the next quickee you build, try applying some epoxy/carbon mixed filets to the 4 corners of your fire wall. This will not only add strength, but will keep those blind nuts encapsulated.


rb

(in reply to Ed Smith)
       Post #: 4

RE: brass inserts - 12/21/2007 2:49:46 PM   
diggs_74



Posts: 1296
Joined: 1/20/2004
From: Emerald, WI, USA
Status: online 		I can't say that I've every had an insert come loose but I alway coat them with some epoxy before screwing them in.. Seems to hold it for at least as long as the plane lives..


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Lee LaValley
NMPRA# 33w

(in reply to luv to race)
       Post #: 5

RE: brass inserts - 12/21/2007 3:22:27 PM   
daven



Posts: 7004
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		I've seen both blind nuts and brass inserts come lose. Personally, I find it much easier to install blind nuts straight than I do the brass inserts.

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Dave Norman

klasskote.com
supertrc.com

(in reply to diggs_74)
       Post #: 6

RE: brass inserts - 12/25/2007 4:08:57 PM   
Electric Delta



Posts: 168
Joined: 1/23/2005
From: Mebane, NC, USA
Status: offline 		I have only tried the brass inserts once, installed with epoxy. They hold fine, but I had a devil of a time getting all four to line up with the holes in the square backplate mount, with the square backplate mount flush on all sides of the fuselage. The holes were drilled accurately, but the way the brass inserts are made with the coarse thread on the outside, they tend not to go in straight, or not to stay exactly on center. Once the groove is cut in the wood by the thread, you can't get the brass insert aligned better too easily. Personally, I am going back to using blind nuts on future projects, just because I find them easier to install accurately.

_____________________________

Auf die Dauer hilft nur Power! Revver Brother #127

(in reply to daven)
       Post #: 7

RE: brass inserts - 12/25/2007 5:31:38 PM   
PylonDave



Posts: 210
Joined: 5/8/2006
From: rancho cucamonga, CA, USA
Status: offline 		Thanks for the feedback! I wound up useing the threaded rod method a Ed suggested.

(in reply to Electric Delta)
       Post #: 8

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