dang dang @#$%^^

[v-6]

well i was working on some blades taking the black off and walked past a chainsaw file. well i had to pick it up and see if it would skate over it .
well out of 5 blades 2 did not skate.
what would you say went wrong.
its 1095
brought it to 1475
soaked in heat about 10 sec after it came to this temp
quenched in parks #50 pre heated to 125 and held it in the oil to a count of 10
then let it cool to about 175
then two cycles in the oven at 350 with 15 min cool down between what did i do wrong.
vern #$%^&*&^%

 

[David Schott]

I'd say that possibly you quenched for ten secs, then heat leeched off the spine or tang when you took it out.

I normally keep mine in the oil until the blade is about the same temp as the oil. Ten secs doesnt seem like very long to get ALL the heat out of the blade. Im sure the edge was cool, but was it cool 10 secs after you pulled it out? Thats another question.

To see an example of this, heat a blade to cherry red, and turn out the lights. Blow on a part of it and youll see it go black, then it will go back to red as the heat leeches back into that section.

This is just one thing that could have gone wrong....it also could have been the speed in which you got the blades into the oil.

Remember that blades should only skate a file right after HT. Its normal for a tempered knife to get bit by a file. if your problem is that you think a few knives are still skating a file after tempering, you may want to grind down a bit to make sure youre not dealing with forge scale. That stuff is HARD.

 

[Kevin R. Cashen]

Adjust your 10 seconds to 10 minutes, and be certain to keep the blade moving under the surface of the oil during quench (tip to tang, never side to side). Be certain to leave a few thousands for removal of possible decarb. A seven to ten count with parks #50 should get you to Ms.

 

[v-6]

thanks guys
vern

 

[aiiifish]

I haven't used Parks but I know with 1095 i get better results with my veg oil at 150. 125 might be perfect with the parks.....

 

[jdm61]

I don't even bother preheating my Parks #50 unless it is cold outside and then I only preheat it to 90-100. Now I may be wrong, but I recall reading that the ideal "operating range" of #50 is 70-120 degrees which is lower than say Tough Quench, which has it's "sweet spot" where it quenches fastest at around 150. I normally don't fire up the Paragon until I have at least 2 blades and I always quench the smaller blade first. That way, the oil is warmed up a little bit for the bigger ones. Not very scientific, but ti seems to work.