Help with castng

[dcpattni]

hello everyone,

my oven ramp 0-10C max per min....so does it mean it will not work for castable b9 emerald resin. advice plz.....Some people advice me pump air in oven i don't have any idea as i'm completely new in casting, upto now casting outscore.

oven Manual http://argenta.pl/argenta_files/file..._X3_web_EN.pdf.

I got B9 burnout schedule but i 'm confused which shows 28F ramp min = in Celsius?

Is it 15.6C ramp min ?

but my oven 10C ramp min max how will i do?

also attached my manual wrote in pink is time and temp i copy from B9 is it correct?

My Supplier and Manufacturer I emailed them no reply.....i don't want to buy new oven as i already invested in this.....why manufacturer didn't realize on this issue while designing.

Plz help me so i can more fwd.

Thank you.

[dcpattni]

My supplier reply below which i feel not good

Our furnace

1) Maximum step per minute is 10, you cannot go beyond that.

2) It has Celsius parameter.

3) There is no decimal step in our furnace, possible - 1-2-3-4-5. Not possible 1.3-2.3-3.3 like this

4) Maximum Temp you can reach 800C.

You need to inform them, your furnace details and they
Should give you chart as per your furnace.

What you sent us from red door – I have never seen and
With this furnace you cannot achieve.

We use this furnace for all Wax casting and resin casting.

Most important is timing and temperature, I am quite sure
Per minute step or ramp they can manage and give you a suitable solution.
For this you don’t need to buy any other furnace.

[rkundla]

The step is only important if you need to ramp up quickly, but in your case for the B9 burnout, it just means it will take longer to get to temperature.

I think at a 10°C/minute step, you will be fine.

[wawatobi]

In my opinion, your problem is mainly investment breakdown. There is some pitting (holes) which is caused by unburned resin but most of the mess is due to the your investment breaking up. The resin is probably not cured enough. Also, using a vacuum mixer with plasticast will give you better results.

[M-Williams]

Are you using plasticast. If so what is your water Ratio.

[M.A.N]

I had a problem like this when i casted my first models. I used satin cast. The problem was from investment.
I switched to "prestige optima" investment and my problem solved.
I cured yellow resin under 2uv lights for 4 hours.
Mixed investment with 40/100 rate
Leave the flask for 3 hours.
Bournout:2h in 150 c - 3h in 400c - 3 hour in 700 c
Then i casted in 700c.
It came out really great.
Since then i use this method for all of my resins.

[dcpattni]

hello,

Flask DIa size 2 1/2'' x 3'' H how many grams powder will go?
For resin direct castable my supplier sold SRS Cadcast investment powder any idea?

[M.A.N]

There are formula on investment barrel.
But I use 110 grams powder for 10 cm diameter flasks for each cm height.
It depends on your models and the way you make wax or resin tree. Some needs a bit more powder to fill 3cm above wax tree. Ofcourse in vacuum pressure casting.
Sorry I haven't use srs investment.

[Jewelermdt]

I use satincast and my chart say's for 21/2 by 3 flask to use 12oz (340.01 grams)of investment. Not sure about the comparison to SRS

http://www.srs-ltd.co.uk/technical/mixing.html 16oz to 172cc of water. So I would start with this and go down from here. Or try 12oz powder would use 129cc of water.