slip joint blade sharpening choil or cutout

[HSC ///]

Am going to spend most of October refining my skills on slip joints,
one thing I've never done well is the sharpening choil angle cut at the beginning of the blade edge.
Anyone care to guide me as to you setup to get a consistent grind here?
What step of your process do you grind this relief In?
Here's one I just completed, obviously I didn't put in the sharpening relief...
thanks

 

[WValtakis]

I just use diamond files when I need to add a sharpening choil to a hardened blade

~Chip

 

[Randy3000]

I hold the blade in a vise where the plunge is exactly vertical and start the choil with a dremel cutoff wheel in my flex shaft. Then use half round needle file. The cheap harbor freight files vary thickness along the edge. You want a file with a good consistent edge, and preferably no taper or at least a long section that is untapered.

 

[Hengelo_77]

hand file pre HT

 

[Alan Davis Knives]

On your platen at the center height of your work rest grind a cutout at about a 45-60 degree angle with about a 1" small wheel. Leave about a 1/16" from front of platen for future surface grinding of platen face. Do it on the side opposite of the tool arm for more clearance. I do them after heat treat and blade is ground. I start with a 120 j flex and normally finish with a 400 j flex.

 

[Don Hanson III]

On your platen at the center height of your work rest grind a cutout at about a 45-60 degree angle with about a 1" small wheel. Leave about a 1/16" from front of platen for future surface grinding of platen face. Do it on the side opposite of the tool arm for more clearance. I do them after heat treat and blade is ground. I start with a 120 j flex and normally finish with a 400 j flex.
View attachment 999356

Great idea!

 

[Don Hanson III]

This makes easy sharpening.

 

[HSC ///]

This makes easy sharpening.View attachment 999436

Don, I see your little trick now in the pic for how you do a Hamon on a slip joint blade,
I had wondered about this since you need the tang to be hard.

 

[Don Hanson III]

Don, I see your little trick now in the pic for how you do a Hamon on a slip joint blade,
I had wondered about this since you need the tang to hard.

 

[Don Hanson III]

To answer your question, I like to do a little notch.

 

[Bill DeShivs]

A 1/8" carbide bit in a rotary tool works very well.

 

[Drew Riley]

I normally use a triangle file, or even a small half round. I'll rough notch with a band saw, then refine with one of either file.

 

[Hengelo_77]

Maybe a bit on the side but I always wondered why classic slip joints usualy have a triangular notch.
Why triangular, why not half round?

 

[REK Knives]

This makes easy sharpening.View attachment 999436

That's nice Don wow!! So do you have a stop pin in that? Different design than most slip joints .. I like it!

 

[Natlek]

Maybe a bit on the side but I always wondered why classic slip joints usualy have a triangular notch.
Why triangular, why not half round?

Maybe because it's easier to do ?

 

[Randy3000]

That's nice Don wow!! So do you have a stop pin in that? Different design than most slip joints .. I like it!

Don is definitely working some geometry magic. I tried to make a pronounced edge about 6 times now, inspired from his work, and cant do it. That is why Don is the man!