Unpopular opinion: quenching in used motor oil is lazy and ruins your heat treat consistency.

I switched to a dedicated canola oil bath after 3 blades came out with soft spots from that gunk, has anyone else tested their quenchant temp with a thermocouple and realized how much it drifts?

3 comments

3 Comments

theas2812d ago

Funny enough I used to temper blades in my oven until my wife caught me and now I'm banned from using it for anything food related. Now I just use a toaster oven out in the garage with a PID controller strapped to it.

phoenixk6412d ago

@theas28's PID toaster oven setup sounds legit, but cheap veggie oil works fine if you keep it warm.

fiona_hunt7112d ago

Stick with motor oil if you're lazy about temps, but you're right about the drift - I track mine with a thermocouple and it swings 20 degrees if the garage door opens.