- Joined
- May 15, 1999
- Messages
- 720
I did six blades yesterday all in a single batch in the new Sugar Creek oven- they all came out fine, hard and straight, no cup or wow or bends or cracks. I also used the Primos method of coating the blades with that PBC stuff from Brownell's:
1). Heat the blades to about first sign of red, then sprinkle with the powdered stuff.
2). After the oven came up to temp [1200 for pre-heat], placed all six blades inside and waited about 20 minutes for the temp to come back up.
3). Ran the oven up to 1450 and let them soak for about 7 or 8 minutes.
4). Quenched in warm oil down to where I could just touch them without burning myself.
5). Stuck them in the tempering oven at 450 for an hour, and quenched in room temperature water [twice].
6). Boiled a gallon of water on the kitchen stove, and poured it over the blades in a different pot, and carried that pot back to the shop.
7). Took each blade and gave it a couple licks on each face with steel wool.
8). Sat amazed and very pleased with the blades, that looked exactly as they had before heat treat. No scale. Period. On anything that was covered with the PCB.
I will take more care when grinding now, to get the blade as finished as possible BEFORE heat treat, and will cover the entire blade from now on.
This was unbelievably easy- I am 100% sold.
Much thanks to Primos for the tutorial in CKD.
here is a link to a pic after they were heat treated:
http://www.scattercreek.com/~windancer/Primos.JPG
Dave
1). Heat the blades to about first sign of red, then sprinkle with the powdered stuff.
2). After the oven came up to temp [1200 for pre-heat], placed all six blades inside and waited about 20 minutes for the temp to come back up.
3). Ran the oven up to 1450 and let them soak for about 7 or 8 minutes.
4). Quenched in warm oil down to where I could just touch them without burning myself.
5). Stuck them in the tempering oven at 450 for an hour, and quenched in room temperature water [twice].
6). Boiled a gallon of water on the kitchen stove, and poured it over the blades in a different pot, and carried that pot back to the shop.
7). Took each blade and gave it a couple licks on each face with steel wool.
8). Sat amazed and very pleased with the blades, that looked exactly as they had before heat treat. No scale. Period. On anything that was covered with the PCB.
I will take more care when grinding now, to get the blade as finished as possible BEFORE heat treat, and will cover the entire blade from now on.
This was unbelievably easy- I am 100% sold.
Much thanks to Primos for the tutorial in CKD.
here is a link to a pic after they were heat treated:
http://www.scattercreek.com/~windancer/Primos.JPG
Dave
