Are they planning on making rotary broaches in China any time soon?

[Flyinfool]

I'll just scrounge thru my ball box and my ball end mill box to find a matching set. The size is not at all critical, as long as the ball and the sockets are all the same size.

I just looked up how much the cutters cost, I guess I will be trying to make and heat treat my own.

 

[rwm]

I recently did this:

Rotary Broach

I finally got around to making a rotary broach for that special project that I have not yet envisioned: I used my Sherline tool cutter and grinder to grind the broaches out of O1 tool steel: I clamped a 1/2" bar in my 5C collet block and mounted the vise with 2.5 deg of angle as viewed from...

www.hobby-machinist.com

Not very complicated. The hardest part was precision grinding the hex cutting tool so it was minimally oversized at the tip. You can see my method in the link. Heat treating is super easy if you use O1.

Robert

 

[Latinrascalrg1]

How are you gonna make that ball?

There are ways to do the same thing without a ball bearing with other simple designs that are out there although getting one is not a problem.

 

[Flyinfool]

Precision balls are cheap and easy to get.
As drawn it is a .500 ball. https://www.mcmaster.com/9528k24

 

[Cobra]

Does anyone have plans for one of these?

Rotary Broach

Started a small project this week to help with some other work. I needed a hex hole in the end of a rod - therefore I needed a rotary broach. This was the sketch I came up with for a simple broach. The tool bit will be made from 1/2" W1 Steel and the other body parts from Stressproof Steel. The...

www.hobby-machinist.com