Radius Grinder Platens

Nathan the Machinist

KnifeMaker / Machinist / Evil Genius
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EDIT: These are all sold out. I did not expect to sell them all so quickly. I'm sorry.

It looks like I need to make a few more. I have to fit that in, but right now I have other work on the machines. When I make more made I'll bump the interest thread in ShopTalk and start another thread just like this one in the sale forum and processes it the same way.

I can not accept orders or payment for parts not made.

Thanks,
Nathan











These are precision machined of A2 steel and hardened to HRC 61-62. It is 1/16" shy of 8" to fit between the rollers, 2" wide and has the KMG 1/4-20 6.75" center to center mounting pattern. $80 shipped continental US.


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I did an interest thread and 48" was the most popular size, so I that is most of what I made here. There are twenty one 48" for sale. I also have three 36" for sale. This is a total of two dozen platens which should more than cover the folks who wanted one.

(edit: I may have misjudged this. There appears to be more interest in 36 than I anticipated. I will have to do another run of these, though I can not take payment or an order for something not made yet, sorry. I'll have more ready probably early next year)

I tried mine out for the first time tonight. I was going to keep a 36, but I had a cull from the 48s, so that what I'm keeping. The effect is subtle, but noticeable. It isn't a flat grind, and it isn't a hollow grind. I believe this is a historically accurate grind for blades ground in yesteryear on really big stones. I see this being a cool grind for blades made in an older style, and blades like kitchen knives that you would want a full height grind on a tall thin blade.

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I ground this blade here out quick and dirty, starting on a 10" wheel and then just walked the grind up with the platten. Butch told me he did it the other way around (flat platen, then the curved platen). I ground from 5000 SFM to 1000 SFM. I used a 80 grind Blaze, 120, 220, 400 and scotchbrite. All tracked well. As you can see I set it so only about half the platen was touching. It got hot to the touch, but I could still hold my hand to it. I wanted to try it out before selling it and I'm happy with the way it worked. I did nothing to it, no finishing, just bolted it on.

This started out as a simple project to make myself a curved platen and perhaps a couple extras for the guys and it turned into a real machining job. So I bought a "dealer membership" to do this sale thread. That gives Bladeforums and Spark their fair share. I'm not "wearing" that membership because I didn't turn it on because I don't consider myself a dealer, but it is there and it is paid for. It was the right thing to do.

If this platen will fit your grinder and you would like to buy one of these, I need you to please follow these instructions to help me keep up with everything (otherwise folks will fall through the cracks).

1: State what you will be getting in this thread.

2: send me an email (not a private message) njcarothers at windstream dought net

The email should include what size you are buying, your BladeForums handle (i.e.: "Nathan the Machinist"), your actual name, your shipping address and your paypal email address.

I will send a PayPal invoice to that email.

3. Pay the paypal invoice. Once it is paid, I will ship your order to the name and address you gave in your order email.

If you don't want to use paypal, we can arrange to send a check.

I don't expect there to be any shortages, but if there are, it will be based upon first come first serve who posts in this thread. I have to do it this way to keep things sane. I tried to make plenty for everybody.

Thanks,
Nathan
 
Last edited:
Nathan, I would like to purchase one of the 36 inchers. I believe I can make it fit on my Bader. I'll send you the requested email.
 
Nathan,
I would like to get a 36" platten. I will send you an email as soon as I finish here.

Thanks
Steve Hostetler
 
Nathan, Put medown for a 48" and I'll get the email right out to you.

Thanks,
Kevin Cross
 
holy crap, this platen is a pure stroke of genius!
i've been wondering how i might be able to re-create the look of a blade ground on a 30" wheel like the old sheffielders used to do it.
(i guess i'll need to make my own, though, since my grinder uses 2 1/2" wide belts)
what a brilliant solution!
well done.
 
Hey Nathan, I'd like one 36"and one 48" (If you still have any of the 36" left.)

Paypal on the way.

Thanks

Jack
 
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