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  #1  
Old 02-14-2021, 07:12 AM
cccjbr6 cccjbr6 is offline
 
Join Date: Dec 2013
Location: Birmingham, AL
Posts: 178
Default need advice countersinking in fiberglass
I need to countersink holes for #6 and # 8 tinnermans in a new Van's nosewheel wheelpant. Can anyone recommend the countersink(s) I should buy for that?
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  #2  
Old 02-14-2021, 07:35 AM
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DanH DanH is offline
 
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Quote:
Originally Posted by cccjbr6 View Post
I need to countersink holes for #6 and # 8 tinnermans in a new Van's nosewheel wheelpant. Can anyone recommend the countersink(s) I should buy for that?
Chris, I know countersunk glass is common, but AN526 screws (with nylon washers) are a more durable solution. Looks better too (small diameter) and stays that way.

https://www.aircraftspruce.com/pages...rews/an526.php

https://www.aircraftspruce.com/catal...lonwashers.php
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  #3  
Old 02-14-2021, 07:44 AM
cccjbr6 cccjbr6 is offline
 
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Thanks Dan. that is great advice. That is a much simpler and better solution.
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$10/month donation gratefully made (worth every penny and painless)
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  #4  
Old 03-09-2021, 08:13 AM
Charles in SC Charles in SC is offline
 
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I use a one hole countersink. I like the flush screw look. I do not remember where I got the countersink. It fits in s drill chuck. There are a lot of ways to skin the cat.
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  #5  
Old 03-09-2021, 08:44 AM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Grinder
I like the screw solution but I use a dremel with a grinding wheel. Spin it up on a coarse grinding wheel and dress the business end to the correct shape. Usually I make the countersink shallow then perfect it with a cutter set to the correct depth.
Reason is fiberglass is hard of steel tools.
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  #6  
Old 03-09-2021, 09:28 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
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Default Permagrit tools
Permagrit tools make a countersink bit that works great.

https://www.permagrit.com/large-countersink-100-degree/
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  #7  
Old 03-09-2021, 10:24 AM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
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Dang, Bob. Why didn't you make that suggestion 20 years ago... could have saved me grief probably 100s of times over the years.

My preference AN507 screws with large diameter Tinnerman washers.
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Last edited by Ralph Inkster : 03-09-2021 at 12:22 PM.
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