Going off memory, and there are a lot of videos so couldn't find it, but didn't Grimsmo switch from CNC machining the hollow grind area (holding the knife vertically and using a carbide ball) to after heat treat instead of before? True? If so what are the pros and cons of doing it this way? What else can be CNC machined in the hardened condition?
-
The BladeForums.com 2024 Traditional Knife is ready to order! See this thread for details: https://www.bladeforums.com/threads/bladeforums-2024-traditional-knife.2003187/
Price is $300 ea (shipped within CONUS). If you live outside the US, I will contact you after your order for extra shipping charges.
Order here: https://www.bladeforums.com/help/2024-traditional/ - Order as many as you like, we have plenty.
CNC machine before or after heat treat?
- Thread starter wayup
- Start date
Drew Riley
Knifemaker / Craftsman / Service Provider
- Joined
- Oct 17, 2007
- Messages
- 4,227
I believe his blades are currently finish machined post-heat treat. I think the norsemans are simply hard milled, and the rasks are hard milled and then finish ground with a wheel. On the most recent episode of the Business of Machining podcast, he talked about trying some new wheels out on his Kern.
Aside from having an essentially "finished" part right off the machine, you can get some pretty nice finishes from hard milling, that, if done properly can also be machined to some very tight tolerances that won't later be affected by a heat treatment process or secondary machining.
Not all CNC machines are created equal, though, so different machines will have varying degrees of sucess (or lack thereof) milling something like a 58 to 60 HRC material. Tooling and tool paths are another major component, also somewhat based on the machine being used.
What else can be machined hard? Some of it depends on the process and techniques, but I'd imagine that just about anything can be machined hard, given proper machine, tooling, and setup.
Aside from having an essentially "finished" part right off the machine, you can get some pretty nice finishes from hard milling, that, if done properly can also be machined to some very tight tolerances that won't later be affected by a heat treatment process or secondary machining.
Not all CNC machines are created equal, though, so different machines will have varying degrees of sucess (or lack thereof) milling something like a 58 to 60 HRC material. Tooling and tool paths are another major component, also somewhat based on the machine being used.
What else can be machined hard? Some of it depends on the process and techniques, but I'd imagine that just about anything can be machined hard, given proper machine, tooling, and setup.
- Joined
- Jul 13, 2009
- Messages
- 20,371
He Ht's then laps flat, that way the blades going into the cnc mill are flat and not warped which would throw off the measurements and the fit into the jig.