Shoulder milling.

[alexmin]

Guys,

if you mill shoulders on milling machine do you use regular end mill that makes 90 deg. cut or you use end mill with rounded corners? Not ball end mill but regular mill with tiny radius on all flute edges.

I am concern about HTing blade with sharp edges.

 

[Chuck Gedraitis Knives]

Either type will work. I just milled one today, beats the hell out of using files~!

 

[alexmin]

You are saying you have no problem during HT with sharp edges?

 

[C L Wilkins]

You are saying you have no problem during HT with sharp edges?

Don't worry about it.

Craig

 

[Karl B. Andersen]

Sharp "edges'? Or corners?
I don't know how you're going to mill shoulders without crisp edges, but a simple 1/8" 4 flute end mill will leave a nice radius at the tang/ricasso junction.

 

[jim moyer]

Sharp "edges'? Or corners?
I don't know how you're going to mill shoulders without crisp edges, but a simple 1/8" 4 flute end mill will leave a nice radius at the tang/ricasso junction.

Could you show your clamping set up. Looks interesting.

Thanks

 

[alexmin]

OK, I should have made myself more clear. I was talking about about milling all four sides of tang. I think it gives you better fit since tang might not be absolutely parallel like milled slot that has parallel sides.

I've never made a hidden knife with a bolster so my opinion is purely theoretical.

 

[Karl B. Andersen]

Could you show your clamping set up. Looks interesting.

Thanks

Jim, check this thread of a couple weeks ago -

http://www.bladeforums.com/forums/showthread.php?t=439862

 

[Karl B. Andersen]

OK, I should have made myself more clear. I was talking about about milling all four sides of tang. I think it gives you better fit since tang might not be absolutely parallel like milled slot that has parallel sides.

I've never made a hidden knife with a bolster so my opinion is purely theoretical.

Yes, it does give you a good fit. I just flatten the tang on my platen a few thousandths at a time. I think this is a pretty good fit -

 

[miden]

Alexmin,
What kbaknife shows is okay.
I think I understand what you are describing and there will be 90 degree angles. That is very dangerous because it could crack during HT, even just hairline cracks and even if it does not crack, it will be a weak spot.
The greater the difference in thickness between the 2 sections the worse the problem will be because the thicker section will cool more slowly than the thinner section and if you have a sharp corner the stress will hit it there.
No prob if you have a radius.
If you do not have a big step it might be okay. That will always be the weakest spot though.
Good luck,

Mike

 

[C L Wilkins]

One other "secret" for a better fit is to mill 2 or 3 thousandths off of the sides as well, not just the shoulders. The shoulders then fit "on" the guard, instead of "in" the guard. The joint is then invisible.

Craig