carbide cutting hard things

[Niels Abildgaard]

It is necessary to shorten a commercial crankpin (casehardened) for a pressed up crankshaft.
Job has been postponed for far to long as I did not know how to do it.
Tried yesterday with a homeground piece of carbide in a homemade holder.
Less than 10 minutes and astonishing surface in hard layer.
Will try some through hard parts tomorrow.

 

[Ned Ludd]

Hi Niels,
Did I not mention sometime ago about using solid carbide in a Tangential holder to turn down the case hardening of gearbox shafts? I know I did somewhere. scratch.gif
It's amazing what "old fashioned" techniques can still do in a modern world, well done.
Ned

 

[Holt]

When i need to turn something hardened at work, i use aluminium inserts, the sharp edge on the insert cuts the steel like butter, but one wrong turn of the handle and the insert is history, and you can forget interrupted cuts
Holt

 

[Niels Abildgaard]

Hello Ned


I have cut crankpins before using commercial inserts .
I did not believe my homemade and non-rounded and flattop carbide could do it.
Without Your guidance mentioning motorcycle shafts I would not have tried it.
Give my regards to Your motorcycle friend and thank you for telling us.

 

[Ned Ludd]

Aw shucks, now I'm embarrassed.
Ned