sochin wrote:
I dont know why casting SWP is so difficult. We have tried everything: different plasters (now we use Optoma Prestige), different tempereatures, bench times, cures etc. No help.
I dont know if our kiln is too big and doesnt heat up fast enough. Thats only thing I can think of.[/quote]
There are so many variables in casting resins but for what I used for B9 Cherry the transition to SWP gave me just as good results...I actually think better and quicker. That said if you have another resin working for you then stick with that. I would have no issues going back to B9 resins if SWP did not work for me.
Here is what I do for SWP ...it may or may not be of use to you if you want to try some more.
I invest as much as I can straight after print. If I am letting the prints stand till the next day then I make sure I rinse them in IPA and blow dry straight before investing. The prints sweat.
The B9 prints store much better IMO (especially after you post cure) than the SWP. I have been experimenting with storing the SWP sealed in a fridge....still undecided if this works as well as casting straight after printing.
I use Omega + investment with demineralised water (tap water is no good for me) that has 13grams per litre of boric acid diluted into it. I have the demineralised water at 13 degrees which gives me a slurry temp of 22 degrees celsius when I add it to room temp investment where I live. I let the investment stand for 2 to 3 hours.
I use a small Neycraft and ramp to the investment max in an hour. I have steel bars on the bottom of the furnace to allow air flow under the flasks. I occasionally open the door to the furnace to add fresh air to assist in burnout. I then hold a bit below that for 3 to 5 hours depending on the size of the model to be cast, drop back to cast temperature and cast. HTH
cheers,
Sochin[/quote]
WOW, thanks! Lot of new information here!
I didnt know that prints can sweat..
I will try these things.