Gap between true end of casting ring and wax pattern should be______________?
Correct answer: C. ¼ inch
- A. 3/8 inch
- B. ½ inch
- C. ¼ inch
- D. one inch
Explanation
A clearance of about 1/4 inch between the wax pattern and the ring end allows investment to surround the pattern adequately while permitting proper thermal expansion. A larger gap may weaken the investment at the casting ring margin.
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