Nathan the Machinist
KnifeMaker / Machinist / Evil Genius
Moderator
Knifemaker / Craftsman / Service Provider
- Joined
- Feb 13, 2007
- Messages
- 17,740
These are precision machined of A2 steel and hardened to HRC 61-64. 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. $100 shipped continental US. These are Sold Out, thank you
This is not the main platen sale. These are some 36" platens that were made and sent out for heat treat before the rest were done. The majority of the run are out for HT now and there will be another sale in a couple weeks with 36", 48" and a couple 72".
There are nine 36" for sale.
In using these platens I have found 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.
This lot of radius platens is different the previous runs. If you look closely, you'll see a tiny hole in the surface of the platen. On the opposite side of the hole I have cut a 1/4" NPT pipe thread (a regular taper pipe thread) which you can (if you want) use to pressurize your platen with air.
I wish that I would have thought of this myself, but this is a feature that I have added by request. However I have tried it and it does work. One of the problems of grinding on a radius platen is heat, and the addition of air between the belt and the platen both reduces friction and cools both of them. It is possible to grind with high belt tension and a large contact area at your highest speed for hours at a time without excessive heat buildup. This only works well with a stiff belt. Once you get into something like a j flex you will find the air cushion rounds the leading and trailing edge a bit. At this point you will want to move away from the air zone or reduce air pressure. I get best results with the air pressure between 5 and 50 PSI.
You don't have to use air to use these platens. This is a feature I have added for folks who do extended grinding and have problems with excessive heat build up.
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 your claim 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, (in this case, a 36" platen) 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 hope there are no 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.
Thanks,
Nathan
This is not the main platen sale. These are some 36" platens that were made and sent out for heat treat before the rest were done. The majority of the run are out for HT now and there will be another sale in a couple weeks with 36", 48" and a couple 72".
There are nine 36" for sale.
In using these platens I have found 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.
This lot of radius platens is different the previous runs. If you look closely, you'll see a tiny hole in the surface of the platen. On the opposite side of the hole I have cut a 1/4" NPT pipe thread (a regular taper pipe thread) which you can (if you want) use to pressurize your platen with air.
I wish that I would have thought of this myself, but this is a feature that I have added by request. However I have tried it and it does work. One of the problems of grinding on a radius platen is heat, and the addition of air between the belt and the platen both reduces friction and cools both of them. It is possible to grind with high belt tension and a large contact area at your highest speed for hours at a time without excessive heat buildup. This only works well with a stiff belt. Once you get into something like a j flex you will find the air cushion rounds the leading and trailing edge a bit. At this point you will want to move away from the air zone or reduce air pressure. I get best results with the air pressure between 5 and 50 PSI.
You don't have to use air to use these platens. This is a feature I have added for folks who do extended grinding and have problems with excessive heat build up.
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 your claim 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, (in this case, a 36" platen) 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 hope there are no 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.
Thanks,
Nathan
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