Coborn skive (or scaife) spindles are precision instruments designed for years of continuous use for diamond polishing.

These spindles have an unmatched reputation in the gem and industrial diamond industry. They must not be confused with cheaper alternatives or traditional belt driver systems.

Spindles are direct drive motors for the scaife plate and normally sold to be fitted to the customer's own benches. The options are:

     • Horsepower (1 or 2 h.p../ 0.75kW or 1.5kW)
     • Fixed or variable height
     • Standard or self pressurized, air-flow type

If only one diamond is being polished, 1 h.p. will be adequate; 2 h.p. is better for multiple users or fixtures.

As plates wear they must be re-machined occasionally. If fixtures are carefully set, then it is useful to be able to raise the height of the plate surface to its original level. Choose a variable height spindle.

It is recommended you remove dust constantly during use to protect operators; choose the air-flow type spindle. This uses the natural exhaust action of the high speed rotation of the plate to draw air and dust into the bowl beneath and then to a filter or external exhaust.

We recommend you use a PBI Portable Balacer to dynimically balance the scaife plate in-situ.