SOHC.co.uk Forums > Project Board
CR750 replica build
McCabe-Thiele (Ted):
I'm guessing a Broaching Machine is not used for making Badges or Ladies Dress Pins. ;D ;D ;D
CR21:
Ted - that would have some scary numbers on! I will keep thinking of a term :D
taysidedragon & Laverda Dave - on these parts they are cut with electrical discharge machining (EDM) as I have access and it is a great process for low volumes.
I have had custom broaches made before:
Of course - 400/4 Kick Start knuckles would not be an issue - are they no longer available? Does anybody have a NOS sample to send across and I can take a look.
The rods and clevis ends are now complete, another piece of the jigsaw sorted.
Cheers,
CR21
taysidedragon:
The only 400f kickstart knuckle I have is cracked and repaired. Most of them fail in the same place where the metal is too weak. Could do with a little more meat in the weak spot. Hopefully someone can lend a precious undamaged knuckle for measurements.
Sorry for hijacking original post!
AshimotoK0:
Some of those CNC EDM machines are mind blowing.
This one uses one of our proportional control valves /closed loop control system that I designed for the electrode flushing with DI water.
They were in Coalville in Leicestershire but now in Shepshed.
https://winbrogroup.com/edm-300-machine-solution/
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Laverda Dave:
I can send an undamaged knuckle to you if I take it off my original 400/4 for you to inspect.
Not only do they crack in the area suggested by Gareth but I think the main reason they crack is when the owner kick starts the bike but forgets to lift the footrest first. This results in the kick start lever hitting the footrest with such force it cracks the knuckle in an already weak area.
The knuckle hasn't been available for years and most used ones are cracked. If you can find an unbroken one (as I did in 2015) it cost me £80 + VAT, import duty and postage from the USA!
If you PM your address I'll send mine over after Christmas via signed for delivery as obviously I don't want it lost in the post😱.
Sorry for the hijack, back to normal service now 👍
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