Nathan the Machinist
KnifeMaker / Machinist / Evil Genius
Moderator
Knifemaker / Craftsman / Service Provider
- Joined
- Feb 13, 2007
- Messages
- 15,676
By request, I have D2 platens and I have platens and chillers for both the KMG and the TW-90
That's not mill scale on the platens, it's heat color from hitting the secondary hardening hump. These are made from PFG (precision flat ground) that I cut to length, threaded and had hardened at Peter's HT.
I've been making A2 platens for years that are extra thick with blind mounting holes and an end radius for grinding lengthwise. That's not what these are. A lot of folks using those platens were not using those features and would be better served with a direct swap with the original KMG platen but in hardened D2, which is what these are. They're 3/8" thick like the originals and there is no end radius.
These platens are made of D2 steel and hardened to HRC 62. They were austenitized at a much higher than normal temperature and cryogenicaly quenched then tempered to the secondary harden hump to maximize abrasion resistance. These will wear better than A2.
I am working on some of the standard A2 flat platens (for lengthwise grinding) and radius platens for the KMG and TW-90 now but they won't be ready for a while.
The platens for the KMG are a 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. They're $90.
The platens for the TW-90 are a 9.25" and 8.0" center to center mounting pattern. They're $100.
The chillers for the KMG are $60.
The chillers for the TW-90 are $70
Flat rate shipping in the USA is $5.
There are twenty flat platens for the KMG and ten flat platens for the TW-90, and the same numbers for the chillers.
The water cooled platen chiller is a very useful gizmo. You just about need one if you're grinding with a belt wrapped around a formed platen, but even folks doing regular flat grinding have found these to be very useful. I've gotten a lot of great feedback about these and I use mine all the time and wouldn't want to be without it. Grinding against a cold platen is a good thing.
These have an internal meandering water path circuit where you can pump, siphon or otherwise flow water to control the temperature of your platen.
The mating surface is precision machined flat and the back of my steel platens are also precision machined flat so you can simply bolt these up and get fairly decent heat transfer. For better heat transfer or to use a platen I didn't manufacture you can use a little thermal grease during assembly to get really good heat transfer.
This chiller is keeping this platen cold enough to form condensation because I use big blocks of ice in my bucket. That's an A2 platen with end radius which is not the platen in this sale. I'm working of some of those now for a future sale.
The chillers are sealed with a buna N o-ring that is rated to 250 F. The assembly can be opened to remove clogs. If opened, you should use a little smear of grease to lubricate the o-ring upon reassembly.
The pipe thread is a standard 1/4 NPT. You are responsible for hooking up your own coolant supply. I recommend swivel push-to-connect fittings and 1/4" or 3/8" plastic tubing, though rubber hose and hose barbs work too. I'm using a dinky little centrifugal pump here and a bucket of water. The meandering coolant path in the platen chiller induces a lot of turbulence in the water flow which helps you get good heat extraction without needing a lot of water flow. An aquarium pump is adequate. Or you might opt to hook up to your regular water supply and simply dump the water (though you'll go to hell for wasting water). Just remember you don't need huge flow or pressure here. Keep up with your tubing to keep it out of the grinder wheels and mechanism using zip ties or similar.
If these will fit your grinder and you would like to buy one, 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) carothersknives at gmail dought com
The email should include what 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 imagine there will be shortages this time, 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
That's not mill scale on the platens, it's heat color from hitting the secondary hardening hump. These are made from PFG (precision flat ground) that I cut to length, threaded and had hardened at Peter's HT.
I've been making A2 platens for years that are extra thick with blind mounting holes and an end radius for grinding lengthwise. That's not what these are. A lot of folks using those platens were not using those features and would be better served with a direct swap with the original KMG platen but in hardened D2, which is what these are. They're 3/8" thick like the originals and there is no end radius.
These platens are made of D2 steel and hardened to HRC 62. They were austenitized at a much higher than normal temperature and cryogenicaly quenched then tempered to the secondary harden hump to maximize abrasion resistance. These will wear better than A2.
I am working on some of the standard A2 flat platens (for lengthwise grinding) and radius platens for the KMG and TW-90 now but they won't be ready for a while.
The platens for the KMG are a 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. They're $90.
The platens for the TW-90 are a 9.25" and 8.0" center to center mounting pattern. They're $100.
The chillers for the KMG are $60.
The chillers for the TW-90 are $70
Flat rate shipping in the USA is $5.
There are twenty flat platens for the KMG and ten flat platens for the TW-90, and the same numbers for the chillers.
The water cooled platen chiller is a very useful gizmo. You just about need one if you're grinding with a belt wrapped around a formed platen, but even folks doing regular flat grinding have found these to be very useful. I've gotten a lot of great feedback about these and I use mine all the time and wouldn't want to be without it. Grinding against a cold platen is a good thing.
These have an internal meandering water path circuit where you can pump, siphon or otherwise flow water to control the temperature of your platen.
The mating surface is precision machined flat and the back of my steel platens are also precision machined flat so you can simply bolt these up and get fairly decent heat transfer. For better heat transfer or to use a platen I didn't manufacture you can use a little thermal grease during assembly to get really good heat transfer.
This chiller is keeping this platen cold enough to form condensation because I use big blocks of ice in my bucket. That's an A2 platen with end radius which is not the platen in this sale. I'm working of some of those now for a future sale.
The chillers are sealed with a buna N o-ring that is rated to 250 F. The assembly can be opened to remove clogs. If opened, you should use a little smear of grease to lubricate the o-ring upon reassembly.
The pipe thread is a standard 1/4 NPT. You are responsible for hooking up your own coolant supply. I recommend swivel push-to-connect fittings and 1/4" or 3/8" plastic tubing, though rubber hose and hose barbs work too. I'm using a dinky little centrifugal pump here and a bucket of water. The meandering coolant path in the platen chiller induces a lot of turbulence in the water flow which helps you get good heat extraction without needing a lot of water flow. An aquarium pump is adequate. Or you might opt to hook up to your regular water supply and simply dump the water (though you'll go to hell for wasting water). Just remember you don't need huge flow or pressure here. Keep up with your tubing to keep it out of the grinder wheels and mechanism using zip ties or similar.
If these will fit your grinder and you would like to buy one, 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) carothersknives at gmail dought com
The email should include what 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 imagine there will be shortages this time, 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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