MACHINING GUIDELINES

The following information should be used as a guide. As a general rule, the maching or cutting should be done wet to reduce dust.

Turning

Use carbide or diamond tools.

If carbide is used:

   • It should have at least a 10 deg. to 25 deg. side relief angle and the same end relief angle, grade CQ2 or equivalent.
   • Feeds and speed at approximately the same rate as turning wood.

If Diamond tools are used:

   • Any good manufacturer diamond tool should be used. For example: Mega Diamond, GE Compacx, etc.
   • Same speeds as carbide.

Grinding

Silicon carbide grinding wheels work the best, but any grinding wheel will work for small quantities:

39 C 46 K8 VK - Norton
6 C 46 K6 VSC - Cincinnati

   • Rough stock removal = up to .050 inch per pass.
   • Finish stock removal = .004 to .010 inch per pass with one wiping pass.
   • Part speed based on surface finish requirements. A good starting point is about 100 SFM.

Facing or Grooving

Same tools as used in turning may be used.

Cut-Off

Any reinforced cut-off wheel will cut fiberglass. Maximum wheel width should not exceed .125".

If non-reinforced wheels are used, an Everett #91, up to 3/32" wide works well.

Plated diamond wheels also work very well using an 80/120 grit size.

Deburring inside diameter

Placing a tightly fitting arbor on the bore of the bearing to support the inside diameter during the cutting will minimize peeling, fuzz and loose strings.

80 grit paper can be used to break the corners. Care should be taken not to roll the fabric back into the bore.