UptownSport
Cast Iron
- Joined
- Jul 25, 2012
- Location
- Cable WI
I want an ER collet holder. I watched a few vids and read this man's helpful post.
I'm planning to use 4140 annealed unless you think better. I'm scared of turning 'Prehard'
Hardening- Is it necessary? I've got no clue here.
Any other advice appreciated.
Thanks in advance
also, a question on the bore.
The diagram shows a backspace (left most part of 'E")- what is this used for? I was leaning towards putting collet next to spindle with only a small space.
Is it for allowing collet with an undersized piece to retreat further?
My calculation is that the space is .35" 9.1mm. seems a little deep for that
How deep does this space actually need to be?
I'm planning to use 4140 annealed unless you think better. I'm scared of turning 'Prehard'
Hardening- Is it necessary? I've got no clue here.
Any other advice appreciated.
Thanks in advance
also, a question on the bore.
The diagram shows a backspace (left most part of 'E")- what is this used for? I was leaning towards putting collet next to spindle with only a small space.
Is it for allowing collet with an undersized piece to retreat further?
My calculation is that the space is .35" 9.1mm. seems a little deep for that
How deep does this space actually need to be?