Edge pro collar.

[Mr. Swede]

Hello chaps.
I'm planning to make strops for my EP out of blanks. I'll use some different media to hold the diamond paste, balsa, pine and hard felt. The problem is that the medias have very different thickness and even if I remove 2 mm from the blanks there will be at least 1-2 mm difference between the strops and the stones. So my question is how much of a difference can the collar handle? Is there an upper limit?

 

[Mr.Wizard]

To provide perfect compensation the pivot would need to be moved t/cos(a) where t is the thickness of the stone and a is the angle in radians between the stone arm and the normal of the back post (zero when the two are perpendicular). So when the stone arm and back post are close to perpendicular you can get away with a lot of thickness variation.

A quick illustration, not to scale. In the first figure moving the pivot up 6mm and the arm away from the table 6mm will keep it at the same angle. In the second the arm–post angle is 19° off perpendicular, so you would need to move the post up 6mm/cos(19°) ≈ 6.35mm to keep the same angle.

 

[Barman1]

I've got the collar but rarely use it seeing as there are 4-5 different thicknesses of media that I'm using, so I use the Angle Cube for every plate change.
A little more time but I'm in no hurry.

 

[miso2]

Ditto.

 

[Mr.Wizard]

Barman1 I also use stones of several different thicknesses, but I don't have an angle cube, just a collar. When maintaining an angle I use it for every stone change except for tape blanks that are all close enough. I find it quite fast and plenty accurate if I stay fairly close to perpendicular as described above. Why do you prefer the angle cube?

 

[Wowbagger]

I find it quite fast and plenty accurate if I stay fairly close to perpendicular as described above.

Yes no problem at all.

Why do you prefer the angle cube?

As far as all the strop after strop stuff.
Just use stones.
I get cryingly fantastic whittling edges off just a Shapton Glass 4k (after three, four or five other stones).
Going to 8k is just playing around.
There are stones up to 30k at least.

Strops ? ? ?
Why ? ? ? ?

 

[Mr. Swede]

Thanks for the responses.
Angle cube is not an option for me because I'm planning to start a small business and time is a factor for me.
Why a strop? After reading "Knife deburring, Science behind the lasting razor edge" by Dr Vadim Kraichuk at Knifgrinders Australia, I want to make strops that carry very fine diamond paste. Another reason is that I started to buy the Matrix series and I want to be able to use diamond all the way to the very end.

 

[sickpuppy1]

To answer your question about the collar though, after you have the angle set up like you want, you take off you stone set it against the bottom off the adjustment ring and them move your adjustment collar up against the base of the stone. Put your stone back in and sharpen as normal. When you go to the next stone or strop, slip it in between the collars and move the adjustment arm up or down ( not the collar) and this will make up the difference in stone thickness. So it’s basically infinitely adjustable.
Hope I explained it correctly/clearly enough.

 

[Blues]