- Reaction score
Don't be hard on yourself, growth in technique is growth. You are growing. I know nobody that does shippable work the forst time they used a new process.This is my 2nd try , here is what I have changed :
- I positioned the edges of the crown outwards and this time pressed only one element, the other sprue is there just because the book said so
- I placed the investment in the bornout furnace at room temp and made the whole burnout much longer hold at 400 C for 20 min and at 850 for more 45 min
- the press program was the same as earlier the own press program for 100g, I had no error this time
- the final result is much better, much smoother surface but the edges are missing again , although this time I made an extra thich edge prepped with a wide shoulder, see the pics.
Is there a calibration program only for press function ? Or that adjust only the heating...?I am really out of clues
It took me about 40 castings before I quit getting at least one coping with pinholes or/and short margins.
You're human, allow yourself to be one.