Bolthole on forks sheared: Mudguard idea's

danson67 · Jan 15, 2013

OK no problem,

You can always have the Helicoil option as a backup if it goes wrong
...Helicoiling would use a 5.2mm hole for M5 thread and a 6.3mm hole for 6mm thread.

All the best,

Thaumaturge · Jan 15, 2013

Absolutely, a comforting insurance policy as i approach this with some trepidation! I saw a vid on the helicoil too.. what a great idea that stuff is. Presume i match drill holes with taps .. m5/5mm bit etc?

Andy R · Jan 15, 2013

Thaumaturge":chwzlfbr said:
Absolutely, a comforting insurance policy as i approach this with some trepidation! I saw a vid on the helicoil too.. what a great idea that stuff is. Presume i match drill holes with taps .. m5/5mm bit etc?

No, the tapping drill size for M5 is 4.2mm. That's the size that you need to drill, in other words.

Matthews · Jan 15, 2013

Bolt size minus thread pitch gives you the hole size to drill.(M5 X.8 is therefor e 5-.8 = 4.2 as Andy R stated. M6 x1 is 6-1 = 5 and so on .)
Matthew

Thaumaturge · Jan 15, 2013

Ooh i seee.. i took pitch to mean the properties of the thread helix.. i.e. its spacing/speed. That makes for some odd drill sizes though doesn't it.. so there are special bits just for predrilling?

hamster · Jan 15, 2013

Thaumaturge · Jan 17, 2013

In the interests of closure, one of the taps i had was a nice round pitch number of 1mm so was able to drill it and tap successfully

danson67 · Jan 17, 2013

was able to drill it and tap successfully

Surely some sort of Right of Passage in bloke-shed world?

All the best,

Bolthole on forks sheared: Mudguard idea's

danson67

Thaumaturge

Devout Dirtbag

Andy R

Senior Retro Guru

Matthews

Thaumaturge

Devout Dirtbag

hamster

Retro Wizard

Thaumaturge

Devout Dirtbag

danson67

Similar threads

Latest posts