hughie
8th April 2007, 06:31 PM
Ern,
Thought I might start another thread.:C this answer is toooo long
I bought the cutter head separately and fitted it to a 3/4'' [19mm] shaft. The cutter is held in by two grub m6 screws at 90' and to date no twisting movement at all.
This extra diameter will give you all the length you require with great stability. I have made them with 1/2'' but I am not so confident on the full extension, hence the heavier size.
I thought of adding to the stiffness of the 1/2'' by deep case hardening. With case hardening its possible to gain anywhere from .5mm to 1.0mm in depth. This provides a glass hard skin to the surface which really stiffens the whole shaft up greatly. The only down side is that you can build up internally at the core allot of stress and it would be wise to anneal the finished hardening. Whoever does the hardening would be in a position to advise and and anneal the shaft.
Thought I might start another thread.:C this answer is toooo long
I bought the cutter head separately and fitted it to a 3/4'' [19mm] shaft. The cutter is held in by two grub m6 screws at 90' and to date no twisting movement at all.
This extra diameter will give you all the length you require with great stability. I have made them with 1/2'' but I am not so confident on the full extension, hence the heavier size.
I thought of adding to the stiffness of the 1/2'' by deep case hardening. With case hardening its possible to gain anywhere from .5mm to 1.0mm in depth. This provides a glass hard skin to the surface which really stiffens the whole shaft up greatly. The only down side is that you can build up internally at the core allot of stress and it would be wise to anneal the finished hardening. Whoever does the hardening would be in a position to advise and and anneal the shaft.