SOHC.co.uk Forums > CB750

That sickening feeling we've all had....

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UK Pete:
Well done phil
pete

Jontyp:
Just a bit of info if anyone wants it. When producing threads in soft material (the alloy used in these engines is a perfect example  ::)) it's often best to use a roll-tap (as opposed to one that "cuts" the thread). I would suggest that is true even for the wire-thread insert tapped hole. A roll tap does what it says really in that it has no cutting edges but compresses the material structure to form the thread resulting in a stronger thread. I haven't checked to see if roll taps are available for helicoil inserts but it might be worth it (I'll certainly be checking when I come to strip/rebuild my motor.

Trigger:
Never heard of or seen a roll tap for coils. I always run a M6x1 tap down all the threads, and if it pulls any threads then a coil is required ;)

Bryanj:
Seen a roll form for spokes but never a tap

Jontyp:
Well, there you go, you can indeed get roll taps for helicoil insert threads.

http://www.engineering-supplies.com/sub/332/metric-helicoil-sti-hss-taps-/

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