1. Home
  2. ⚙ Model Engineering in the UK
  3. Split dies

Split dies

I have several threading dies that I inherited that are not split but shoul d be. The 'new old stock' un-split die I've just started using is a 1/4" BS F but I do have other sizes. I t works OK, but being able to adjust it coul d be useful.

They are 'normal' HSS round dies with dimples on the circumference where th e die-holder adjusting screws fit and vee slots where they should have been split for the spreading screw.

I have an instruction from the manufacturer stating that the die should be split before use. No instructions were given on how to actually split the d ie and I'm reluctant to give it a whack with a cold chisel or similar. Othe r split dies I own have obviously been split after manufacture.

Although I could split the die with a Dremel or similar, I would like to kn ow how it was done properly.

Does anybody know how this was done?

Thanks in advance.

John H

Reply to
John H
Loading thread data ...

Not with a cold chisel :-)

Cutting HSS isn't easy, as I am sure you know, and a solid chunk like a die would probably challenge a Dremel. I've drilled hardened steel using a tungsten drill but it took some doing. Given the choice, I would aneal, machine, harden, temper something previously hardened etc. However, that probably isn't practical for you die.

Are you sure it is intended to be split and it isn't a 'repair' die which, I believe, are not split. They have the dimples but they stop the die turning in the holder.

Reply to
Brian Reay

Slim cutting disk in a 4"angle grinder would do it for me .

Reply to
Bluey69

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.