need advice countersinking in fiberglass

cccjbr6 · #1 02-14-2021, 07:12 AM

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?

DanH · #2 02-14-2021, 07:35 AM

Quote:

Originally Posted by cccjbr6

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

cccjbr6 · #3 02-14-2021, 07:44 AM

Thanks Dan. that is great advice. That is a much simpler and better solution.

Charles in SC · #4 03-09-2021, 08:13 AM

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.

wirejock · #5 03-09-2021, 08:44 AM

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.

rocketman1988 · #6 03-09-2021, 09:28 AM

Permagrit tools make a countersink bit that works great.

https://www.permagrit.com/large-countersink-100-degree/

Ralph Inkster · #7 03-09-2021, 10:24 AM

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.