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Helicoil... Update 17th Oct!... Need To Source Bolts


Sponge

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Its not neat but loctite up your m6 hole get one of the bolts ove got below get it as tight as you can and make sure you cant get it out then grind of the top of the bolt so its level if its to tight tap it to m5. this is the way i do it and it works so much better than any helicoil.

post-18099-1222468113_thumb.jpg

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Sounds like a good idea first impressions. So it's basically already some sort of M6 bolt with a hexagonal head, with a hole through it already? Say I want to tap to M5, and the hole in the centre is only 3mm or so.... Do i definitely have to drill it out wider? Considering it's hardened steel probably. Or can an M5 tap really cut well and sharply into a slightly small hole?

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it works so much better than any helicoil.

Not so sure about that, I'd find a helicoil kit alot easier to do than to start drilling larger holes into mounts potentially weakening them and then taking a grinder to the bolt you just put in. Not to mention I can't see that functioning any better than a WTI That's also a fair lump of steel for a light bike, might not bother bashers though I guess.

Just to echo what's been said before, if you look at a WTI as it goes in off the inserting tool you'll see that the tool compresses it so that as it goes into the newly tapped hole it expands and grips against the threads.

Sounds like a good idea first impressions. So it's basically already some sort of M6 bolt with a hexagonal head, with a hole through it already? Say I want to tap to M5, and the hole in the centre is only 3mm or so.... Do i definitely have to drill it out wider? Considering it's hardened steel probably. Or can an M5 tap really cut well and sharply into a slightly small hole?

You'd definitely need to drill it out, a tap isn't designed to cut that deep into the sides of the hole so I imagine it would be very difficult to even start the tapping process even with a fully tapered unit and as mentioned above it's likely to break the tool.

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  • 3 weeks later...

For the time being I'm running what appears to be M6; but I would still like to convert to M5; since I want to run a booster; and it'd be a pain the ass to drill everything out.

Is there any major harm in trying to insert an M5 helicoil into my thread? The previous owner isn't sure if he tapped it out to M6 or M5.5 (or whatever taps get supplied with helicoil kits); so before doing so, what risks should I acknowledge and is the risk of thread stripping high if I try putting an M5 coil in? and at what point will I be able to tell for sure if the actual thread was tapped to M6 or M5.5? Too-loose fitting helicoil?

The tightness of brake clamps need not be so high; so could I get away with it even if it were really M6 coiled to M5?

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ah fair enough, thanks guys.

As for helicoiling itself, would inserting it into M6 work? Say, I loctited it, to tighten the space up? Or does the helicoil work by expanding/retracting like spring inside the alu?

First of all don't use loctite with helicoils or anything that works in a similar way as it will decrease the holdingforce because the coil will only be clamping a soft material rather than metal. As for what to do, i'm sure a local engineering firm will fill and drill the hole for around £10, which would solve all of your problems. Also if you phone argos cycles they may be able to just change the mounts on your bike.

Failing that get a normal nut for an m5 bolt, drill the top 2mm of the whole on the mount just slightly smaller than the nut, then hammer that b*stard in. If you use some stong adhesive around the nut and don't overtime too much it should be fine. I once rode for a week with a bolt on each side of the mounts not actually in the frame at all, just used the nut to clamp the mounts closed. Worked fine.

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Cool, but as for the actual helicoiling idea; i might take the gamble... since I am not clear on whether my threads were tapped to M6 or M5.5 (whatever the thread size on the tap supplied on helicoil kits). CLS did it, but hasn't really answered back. So if by luck he did it to M5.5, then I can helicoil, but say it is M6, then would helicoiling simply fail altogether?

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I doubt it would be m5.5?(helicoil tap) if you say your m6 bolt is in there. What I would do is grab a helicoil kit, put a helicoil in halfway through so that some of the coil is sticking out, then try and put the m5 bolt in and see whats its like. If it doesnt work and is too loose, take the bolt out, and uncoil the helicoil from the frame to get it out, using the bit coil not inserted to the frame. If it does work then still take the helicoil out and put one in properly.

Well thats what Id do.

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Righteo, I'll stick with M6 for the time being unless some mircale solution pops up!

I have to run a booster with my current frame as it is rather old; and I don't want premature frame death, not to mention a stiff brake is nice. So I'll need to drill out bits and bobs to suit M6. I can source out everything, but except for one thing:

control_booster.jpg

The bolt spacers! They are about a centimetre or so long, but does anyone know where I can get such types of things online with a 6mm hole? I could alternatively use multiple 6mm washers, but it's more convenient just to use a long spacer. So yeah, if you know anywhere that might sell such a thing, then do let me know!

Thanks

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Yeah the V-brake spacer thing could work. Am i right in thinking that these concave and convex spacers are the same things that are used to space the pads on a V-brake? These are also on Avid mechanical brakes' caliper IS-Post adaptor right?

Drilling out is an idea, as I have some; but the problem would be that it might get so thing that it crumples upon being bolted down

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The bolt spacers! They are about a centimetre or so long, but does anyone know where I can get such types of things online with a 6mm hole? I could alternatively use multiple 6mm washers, but it's more convenient just to use a long spacer. So yeah, if you know anywhere that might sell such a thing, then do let me know!

Thanks

Edd Potts.

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Had an idea; how about get an M6 grub screw...and loctite it in (with whatever's most powerful and drill the hexagon insert to a 5mm circle, and then tap it?

Since a hole is already sorta there, because it's a grub screw, that'd save me a lot of work?

Theoretically could I actually just try tapping into that hex hole? so it'll just cut and cut it into shape?

A2_ScrewBolt_GrubFlat_M6_10.jpg

Edited by Sponge
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The bolt spacers! They are about a centimetre or so long, but does anyone know where I can get such types of things online with a 6mm hole? I could alternatively use multiple 6mm washers, but it's more convenient just to use a long spacer. So yeah, if you know anywhere that might sell such a thing, then do let me know!

Thanks

vehicle brake pipe fittings, i use them on my regular m5 threaded bike, because i lost a spacer, and there basically the same height, and still fit in the slots in my echo bash. there internal size is either 1/4", or 6mm dependant on if you get metric or imperial.

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The bolt spacers! They are about a centimetre or so long, but does anyone know where I can get such types of things online with a 6mm hole? I could alternatively use multiple 6mm washers, but it's more convenient just to use a long spacer. So yeah, if you know anywhere that might sell such a thing, then do let me know!

Thanks

Head to B & Q. The have lengths of small section hollow tube in steel or alu for a couple of quid. Or, if you send me a SAE and how much you need i'll cut some that I have.

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