Knifemaking Tuesdays Week 55 - Threadmilling fail Media
Published: 11 years ago
This week Erik and I started prototyping a new lock stabilizer device for our Norseman knives, this is a variant of the Rick Hinderer LBS. It's the same basic concept except machined from one solid piece of titanium instead of using a disc and a screw. We're attempting to make a round part (ideal for lathe) on my Tormach milling machine. This allows us to use a scrap piece of titanium sheet metal clamped to our Mitee Bite vacuum fixture.
The second machining operation was a process called threadmilling, where we use a special endmill to cut threads on the outside of a shaft or on the inside of a hole. We failed with epic fashion, breaking yet another expensive 4-40 threadmill. It's a wonderful process, in theory, because you can tweak the code and make threads that are slightly bigger or smaller for a better fit, and you can make really weird threads very easily if you need to. Also you can thread blind holes all the way to the bottom, or in this case a shaft all the way to the base.
For the machining guys here's some info: www.LakeShoreCarbide.com 4-40 threadmill which is 0.085" diameter, 0.18" long, 2 flutes. 2000rpm 2ipm, doing 4 passes, it broke on the second pass. Material is 6AL-4V titanium and the nub was 0.112" dia. I was external threadmilling via climb milling, which goes top to bottom. Air blast was on, but no coolant. ANY info or help would be very appreciated. I have a LOT of threadmilling to do in the near future so I want to get this right.
Stay tuned next week where we hopefully fix this problem and finish the new component. Thanks for watching!
www.GrimsmoKnives.com
The second machining operation was a process called threadmilling, where we use a special endmill to cut threads on the outside of a shaft or on the inside of a hole. We failed with epic fashion, breaking yet another expensive 4-40 threadmill. It's a wonderful process, in theory, because you can tweak the code and make threads that are slightly bigger or smaller for a better fit, and you can make really weird threads very easily if you need to. Also you can thread blind holes all the way to the bottom, or in this case a shaft all the way to the base.
For the machining guys here's some info: www.LakeShoreCarbide.com 4-40 threadmill which is 0.085" diameter, 0.18" long, 2 flutes. 2000rpm 2ipm, doing 4 passes, it broke on the second pass. Material is 6AL-4V titanium and the nub was 0.112" dia. I was external threadmilling via climb milling, which goes top to bottom. Air blast was on, but no coolant. ANY info or help would be very appreciated. I have a LOT of threadmilling to do in the near future so I want to get this right.
Stay tuned next week where we hopefully fix this problem and finish the new component. Thanks for watching!
www.GrimsmoKnives.com