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anyone have 3 stage burnout schedule ?

Posted: Tue May 21, 2019 4:22 pm
by Slava@Marx

My oven only programmable to 3 ramps anyone has a successful schedule to ramp over 3 steps, not 4?
my casting is not bad but pitz bothering me. what I do currently is ramp up with 20F/min to 350F and seat there for 3 hours then ramp up to 1400F with rate 3.5F/min (slow to compensate not having it seats at 700F ) and seat there 4 hours then ramp down with 40F/min to 1100F seat there 1.5 hour and cast I use yellow I casted this one in 18K green gold

Re: anyone have 3 stage burnout schedule ?

Posted: Thu May 23, 2019 12:36 pm
by akgold
I don't use a step ramp on my kiln.
I use Satin Cast and I turn my kiln to go directly to 1450 deg. F.
I think your castings look just great especially considering the thickness of your
model in that video.
Keep doing what you're doing it looks fine to me.

Re: anyone have 3 stage burnout schedule ?

Posted: Thu May 23, 2019 12:54 pm
by Robert Howle
Been using this for months now.

1) 350 F for 2 hrs (completely cure models and cure investment).

2) Up to 1450 F and hold 2 to 3 hrs. (heavier models or larger trees 3 hrs, ramp speed is 999 degrees per hr).

3) Down to casting temp over 1 hr and hold min of 1 hr before casting. (I cast at 950 F for all metals, and don't cast plat in house).

Like AK says, casting looks really good. Might suggest u do some cleanup in the resin. Files and sands and drills fairly easily when cured.