KMG Rotary Platen attachment

A

alexmin

Joined
Nov 16, 2005
Messages
513
I got KMG Rotary Platen attachment about 6 month ago because some folks here recommended it. I rarely use it and it's only for handle work. I never got used to it for grinding blades.
Can you guys share on how you use it to grind blades?

Thanks,
Alex
 
alexmin said:
I got KMG Rotary Platen attachment about 6 month ago because some folks here recommended it. I rarely use it and it's only for handle work. I never got used to it for grinding blades.
Can you guys share on how you use it to grind blades?
Click to expand...

It's a worthless hunk of scrap metal, you should send it to me and I will ensure that it never troubles anybody again. :D

In all seriousness though, I'm interested to see the answers here since I know that a rotary platen HAS to be really useful, I just can't picture how.

-d
 
Oh my God, you haven't used it for blade grinding yet!?:eek: :D That has to be the best fu**in' piece of equipment ever made for a grinder. I'm in convex grind heaven. Seriously, the tighter you make the rotary belt, the flatter the convex grind will be. It is mainly for convex grinding. Just use it like a flat platen. I grind on the widest section of the attachment.
Scott
 
It has cut my convex grind work in 1/2. Also, I like rather smooth racisso lines instead of very sharp, and the platen helps do that. I run the belt over the edge of the rubber belt and there it is. There's a learning curve, and it's well worth learning it. It's my main attachment piece. Now I'm trying to save up for the horizontal grinder.
 
I watched Kali&k9's use IG's rotary platen at the last HI... as I've epressed in the past, I'd give my left ball to have one, but alas! Rob doesn't make it for the ol' Square Wheel.
 
Robert,

can you please post a picture of a knife made on rotary attachement?

Thanks,
Alex
 
You should see the sexy fillet knife grind it will do. Also I have some students on Thursday nights that have never ground a blade before. They struggled badly until I put the rotory attchment on my burr king. They instantly became experts. It is very forgiving for beginners.
 
Personally (for me)... it's not a GRINDING tool, it's a finishing tool.

Part of my contrasting thoughts are due to the fact that I DO like sharp, crisp lines. Part of that, to ME, is having a crisp plunge cut.

Because of that, I did not like the rotary platen at first!

It was because I was trying to get too much grinding out of it though.

My friend and Mastersmith, Mike Vagnino, pointed out to me that it can still be used with knives like ours though. You simply need to get the majority of your work done on the platen and disc sander.

Once I get the plunge cuts ground in to exactly where I want them, and the edge thickness down to about 0.005-0.010" then I will use the rotary platen to feather it down to an edge.

I do not like the "cordorouy" Trizact belts for most things, but because of their make-up, they work very well for finishing out grinds on the rotary platen.

If I have to start sanding with anything more coarse than 320X, I go back to either the disc or the rotary platen.

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edited to add this pic of one of those blades completely finished. Working with the method I mentioned, you end up with a very thin edge, and a very smooth, flat appearance to the grind.

WheelerNick.jpg
 
Cool pics....:thumbup:

been debating about getting the rotary...should've grabbed one at Blade (duh...) but had about 0.5 seconds to myself away from my table.

Nick - what grit do you finish at, on the flat? (before you move to the rotary)
- and then which grit do you start at on the rotary?
 
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