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The helix angle of reamer is negative because to make the reamer more regid so that the reamer can withstand the vibration during reaming
A reamer is a tool, not a material.
The melting point would depend on what material the reamer is made of.
Robert Reamer died in 1938.
Robert Reamer was born in 1873.
Cory Reamer was born on 1987-05-06.