Round Threads
Round Threads
(OP)
I am working with a weak composite where I have to drill a hole and tap it. From there I have to make a plug from the same material to fill the hole. Due to how brittle the material is I cannot use a standard UNC thread. I have looked into using ACME threads but my manager suggests a round thread similar to those found on a light bulb where there is not a sharp corner. Does anyone know what kind of thread this is? Or something similar?





RE: Round Threads
has a radius at both the peak and valley of the thread.
Seems like it would be far better to put a chunk of metal in the mold during the layup so that you could tap metal instead of whaever.
RE: Round Threads
http://www.sizes.com/tools/thread_whitworth.htm
RE: Round Threads
RE: Round Threads
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Round Threads
http://www.hexagon.de/dose/dose-1e.pdf
Look down the page as there are several standardss for round threads including the Edison Light bulb Thread, again known as a Knuckle thread.
http://mdmetric.com/fastindx/t44u.pdf
RE: Round Threads
Call them. Are you willing to pay for a special tap?
Have you considered thread inserts?
RE: Round Threads
If I recall correctly you can have a radius at the root of UN threads by choosing UNR (think that's right) but it probably isn't enough of a rad for what you're dealing with.
KENAT, probably the least qualified checker you'll ever meet...
RE: Round Threads
www.britcycle.com
Ask any old Triumph owner.
RE: Round Threads
RE: Round Threads
Have you tried some of the taps for hard steel or cast iron?
http://www.besly.com/stdtaps.htm
RE: Round Threads
Don
Kansas City
RE: Round Threads
Thanks everyone for your advice. I think I have the problem under control.
RE: Round Threads