Hi folks,
I am trying to put 12mm AF hex holes into the centre of 34mm round threaded discs sitting in the lathe chuck.
An expensive wobble-broach bit was purchased along with a holder for said "bit", and that meant also buying a bigger chuck for the tailstock of the lathe to hold the wobble-bit holder itself.
The money expended on new shiny things to accomplish this task is now >£100.
Only issue is that the bit just doesn't wobble and doesn't cut the hex keyway.
Now I understand that "some" wobble-broach holders have the required 1° offset inbuilt into their structure, and some don't.
I can only assume that mine does not. So how do I get the tailstock to skew by 1° off true?
And IF I could do that, as the business-end of the bit is many CM's away from the root of the tailstock will it not now be making a hex-hole wayyyyyy off-centre of the disc?
I am stumped. Can anyone shed some light on this problem please?
Thanks in advance.
I am trying to put 12mm AF hex holes into the centre of 34mm round threaded discs sitting in the lathe chuck.
An expensive wobble-broach bit was purchased along with a holder for said "bit", and that meant also buying a bigger chuck for the tailstock of the lathe to hold the wobble-bit holder itself.
The money expended on new shiny things to accomplish this task is now >£100.

Only issue is that the bit just doesn't wobble and doesn't cut the hex keyway.
Now I understand that "some" wobble-broach holders have the required 1° offset inbuilt into their structure, and some don't.
I can only assume that mine does not. So how do I get the tailstock to skew by 1° off true?
And IF I could do that, as the business-end of the bit is many CM's away from the root of the tailstock will it not now be making a hex-hole wayyyyyy off-centre of the disc?
I am stumped. Can anyone shed some light on this problem please?
Thanks in advance.