Source for cut thread push rods
#1
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Source for cut thread push rods
I am looking for 12" steel push rods with 4-40 cut threads on both ends. I don't know if the Dubro's are cut or rolled. I'd like to buy a small tube of 20 or so (or more if the deal is good enough). Does anyone have a favorite place where they buy them?
TIA
TIA
#2
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Location: southport, UNITED KINGDOM
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RE: Source for cut thread push rods
my lhs sells them. just a shame they are a few miles away from you. try towerhobbies.com ive never used them but ive seen their online stuff. may have what you are looking for.
#8
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RE: Source for cut thread push rods
ORIGINAL: Matt Kirsch
Any particular reason you're looking for CUT threads as opposed to rolled?
Any particular reason you're looking for CUT threads as opposed to rolled?
Rolled threads work too - but IMO you are much more likely to need a fairly thick threadlock compound to fill in the gaps.
Gordon
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RE: Source for cut thread push rods
On the downside, cut threads have nice little stress concentrations at the bottoms of the threads. This is particularly bad if the threads are die-cut, as opposed to cutting them on a lathe. The material also has to be soft enough to not chew out the die on every cut. I don't really see Dubro, GP, etc. heat treating the pushrods after cutting them.
I'd go for rolled threads anytime. You can fix the slop in clevises with thread lock and locknuts. There are gap-filling compounds sold as well. Loctite have a thing called 'bearing mount' which can take up a few thousandths of an inch.
Another source of rod is bicycle spokes. As far as I know, these always have rolled threads. They tend to be made of better material (stiffer) than most of the RC hobby pushrods I've seen, to. I can't say whether they'd be available with a 4-40 thread, though.
If you still have a stiffness problem, some close-fitting carbon fibre tube glued around the rod can help.
I'd go for rolled threads anytime. You can fix the slop in clevises with thread lock and locknuts. There are gap-filling compounds sold as well. Loctite have a thing called 'bearing mount' which can take up a few thousandths of an inch.
Another source of rod is bicycle spokes. As far as I know, these always have rolled threads. They tend to be made of better material (stiffer) than most of the RC hobby pushrods I've seen, to. I can't say whether they'd be available with a 4-40 thread, though.
If you still have a stiffness problem, some close-fitting carbon fibre tube glued around the rod can help.