fixing a stripped rotor bolt hole

[BobBurnes]

Originally Posted by BrewMaster

I ran a rotor with 5 bolts. It's no problem.

The failure may or may not happen right away, but believe me-it will.

It's like running a car on low oil-it's good for a time.

Heed.

[2wheel_lee]

I'm a big fan of timeserts. If I recall correctly, you can even find those in metric sizing at some Pep Boys! I'm not sure about that small, though.

Did you trash two holes right next to each other?

[chupacabra]

Originally Posted by 2wheel_lee

I'm a big fan of timeserts. If I recall correctly, you can even find those in metric sizing at some Pep Boys! I'm not sure about that small, though.

Did you trash two holes right next to each other?

Of course. It looks like the timeserts have a lip. Is that lip going to protrude from the surface?

[Rivet]

Heli-coils are your best bet. An easier fix is Loctite "Form A Thread"

http://tds.loctite.com/tds5/docs/81668-EN.PDF

[chupacabra]

Originally Posted by Rivet

Heli-coils are your best bet. An easier fix is Loctite "Form A Thread"

http://tds.loctite.com/tds5/docs/81668-EN.PDF

I'm gonna try the "form-a-thread" first. No drilling required. And if it doesn't work, I'm out $10 and some time. Then I can look into the inserts option a bit more.
thanks all

[project_d]

Originally Posted by 2wheel_lee

Considering how many people run only 3 of their 6 bolts, presumably to save weight, if you can't fix it, I'd just continue to use it.

Lee, as usual, you're right on the money.

I took a DH clinic with Eric Carter & Rich Houseman a few years ago. I noticed that EC was running only 3 rotor bolts; I asked him why and he said, "3 bolts holds the rotor just as good as 6." Since then, I've been running 4 rotor bolts on my SC Nomad as well as my Intense M3. I've had ZERO problems!

So...don't bother fixing it, instead, take one or two more out and lose some grams!!!

[g-dub]

Originally Posted by Rivet

Heli-coils are your best bet. An easier fix is Loctite "Form A Thread"

http://tds.loctite.com/tds5/docs/81668-EN.PDF

I just read the loctite spec sheet. The max torque values are too low for this application.

If a locking nut will fit between the bolt flange and the hub shell, get a longer grip bolt, superglue the nut to the wrench to hold it in place for a minute, and torque it up.

I've had bad luck with the locking feature on helicoils. The Timesert looks cool except for the flange, though you could file that off before insertion. If the flange is Aluminum and the timesert is steel, you'll want to goop up the outside of the insert with primer to inhibit corrosion.

[RacinJason]

Hey Bob hows it goin? Yeah I though the same thing for a long time then I noticed a load of people using 3-4 bolt combo's All of the guys that I noticed doin it where Expert XC guys. For 4X and DH wouldnt think of it.
I set my SS bike up that way and it works fine.

[BobBurnes]

Originally Posted by RacinJason

Hey Bob hows it goin? Yeah I though the same thing for a long time then I noticed a load of people using 3-4 bolt combo's All of the guys that I noticed doin it where Expert XC guys. For 4X and DH wouldnt think of it.
I set my SS bike up that way and it works fine.

Hey, Jason! Yeah, I think it's just the crew chief in me spinning in circles when I hear about missing bolts, over-torqued hardware...I'm just ate up about those kinds of things, but then, I make sure 23.3 million dollars worth of special operations helicopters stay in the air so it shouldn't be a surprise .

[arider]

heli coils are not the best option...there are better ways to replace/rethread a part depending on how much space or metal you have to work with.....go online to McMaster-Carr and look up thread repair...basically you drill/tap a larger diameter hole,tap it out and thread in the insert....key it in if you get the high strength permanent locking type and then insert your original bolt -it can actually end up much stronger than the original configuration if you have enough metal around the hole.
Allen

[Chewyeti]

timcert is waaaay better than a helicoil.

[thephat]

A lot of DH racers run 3 rotor rotor bolts for easy wheel changes. I don't think it's for the gram savings.

Keep an eye on em.

As mentioned before, they should at least form a triangle.

[Rivet]

Originally Posted by Chewyeti

timcert is waaaay better than a helicoil.

Time-serts require spot facing the part so the flanged edge doesn't interfere with the rotor. Spot facing is not a home job.

[Shu]

Originally Posted by Chewyeti

chase the threads first.... (get a tap.. and try to clean them up)

you will need a bottoming out type tap...

change to centerlock hubs so this won't happen....lol

[Shu]

Originally Posted by BobBurnes

I make sure 23.3 million dollars worth of special operations helicopters stay in the air so it shouldn't be a surprise .

~If the wings are traveling faster than the fuselage, it's probably a helicopter . . . and therefore, unsafe.

~You can't fly forever without getting killed, what a way to go!

~The three best things in life are a good landing, a good orgasm, and, a good bowel movement. The night carrier landing is one of the few opportunities in life where you get to experience all three at the same time.

[HELLDOG]

Just curious, What kind of hub did you strip?

[chupacabra]

Originally Posted by HELLDOG

Just curious, What kind of hub did you strip?

White industries. I was using my drill motor to put install bolts.

I just finished retaping the hole and using a new bolts. It seems that it may have fixed the problem, although I am leery to torque them down. I'll leave them like that and see if they loosen up.

[Chewyeti]

yup... that'll kill it. (drill motor that is)

[thephat]

Yeah,

It's a lesson I once had to learn.

Don't use a drill to turn your rotor bolts unless you back off the speed and or back off the torque a lot.

[chupacabra]

Originally Posted by mechmann

you must have been wearing your "Bad Idea" jeans!

I'll blame it on the "I've got to get this done before wife notices I'm tinkering on the bike again." excuse.