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MACOR® Machining Specifications*

General Information

Important factors for successful processing of MACOR Semi finished MACOR parts, MACOR toolsare proper machining speeds and the selection of a suited coolant. The glass ceramic can be processed with conventional HSS tools although it is recommended to use carbide tools for longer wear. Further it is recommended to use water soluble coolants designed for sawing and grinding glass or ceramics. Post firing after machining is not necessary.


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Sawing

  • Carbide grit blade
  • Alternative: Silicon carbide or diamond cut-off wheel
  • Band speed approx. 30,5m/min

Turning

  • Cutting speed: approx. 9-15m/min
  • Feed rate: approx. 0,05 - 0,13mm/round
  • Depth of cut: approx. 3,8 - 6,4mm

Milling

  • Cutting speed: approx. 6,1 - 10,7m/min
  • Chip load approx. 0,002 ipt
  • Depth of cut: approx. 3,8 - 5,1mm

Drilling

Drill size
(mm)

Spindle Speed
(rpm)

Feed rate
(mm/r)
approx. 6,4 300 0,13
approx. 12,7 250 0,18
approx. 19,0 200 0,25
approx. 25,4 100 0,30
approx. 50,8 50 0,38

Tapping

  • Clearance holes approx. 0,2-0,3mm larger than those used for metals
  • Chamfer both ends of the hole
  • Run the tap in one direction only
    (Do not turn the tap back and forth)
  • Continuously flush with water or coolant to remove chips and dust

Grinding

  • Use diamond, silicon carbide or aluminium oxide grinding wheels

Polishing

  • Start with loose 400-grit silicon carbide on a steel wheel
  • Final polishing with cerium oxide or alumina on a polishing pad for glass or ceramics.

*We do not overtake any liability for any of the machining specifications mentioned here. Errors are possible and excepted.