Specifications

Tolerances up to 0.0005"Configurations are limited only by available equipment and the experience of the machinist.

TURNING
Cutting speed 30-50 sfm
Feed Rate 0.002-0.005 ipr
Depth of cut 0.1 50-0.250 in.

MILLING
Cutting speed 20-35 sfm
Chip load 0.002 ipt
Depth of cut 0.1 50-0.200 in.

DRILLING
Drill size – Spindle speed – Feedrate
   1/4 inch – 300 rpm – 0.005 ipr
   1/2 inch – 250 rpm – 0.007 ipr
   3/4 inch – 200 rpm – 0.010 ipr
   1 inch – 100 rpm – 0.012 ipr
   2 inches – 50 rpm – 0.015 ipr Allow at least 0.050" of extra material on the back side for breakout. This excess can be removed after drilling.

TAPPING
Make clearance holes one size larger than those recommended for metals. Chamfer both ends of the hole to reduce chipping. Run the tap in one direction only. Turning the tap back and forth can cause chipping. Continuously flush with water or coolant to clear chips and dust from the tap.

GRINDING
Diamond, silicon-carbide or aluminum-oxide grinding wheels can be used.

POLISHING
Start with loose 400-grit silicon carbide on a steel wheel. For the final polish, use cerium oxide oralumina on a polishing pad for glass or ceramics. A 0.5 pin – AA finish can be achieved.