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  • Overview
  • Strengths
  • Technical Details

Scaif Spindles for Diamond Polishing

Coborn scaif (or skive) 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. Spindles are direct drive motors for the scaif plate and normally sold to be fitted to the customer's own benches. The options are:

• Horsepower (1.5hp or 3hp / 1.1kW or 2.2kW)
• Fixed or variable height
• Standard or self pressurized, air-flow type

If only one diamond is being polished, 1.5hp will be adequate; 3hp is better for multiple users or fixtures.

The Expanding Nose is a very important feature, which ensures the scaif plate is centralised onto the spindle axis for smoother running and makes the changing of scaif plates much easier.

As plates wear, they must be re-machined occasionally. If fixtures are carefully set, then it is useful to be able to raise or lower the height of the plate surface to maintain its working level. A variable spindle is available.

It is recommended dust is removed constantly during use to protect operators. An air-flow type spindle is available.This uses the natural centrifugal 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 PB2 Portable Balancer to dynamically balance the scaif plate in-situ.

Strengths

  • Extreme rotational accuracy.
  • Reliable and long-lasting as proven by the
    thousands in use around the world.
  • There is no vertical spindle above the bench as
    in a traditional scaif. An open top bench is more convenient.
  • The shaft and drive rotor is dynamically
    balanced to gyroscopic levels of accuracy.
  • Sealed for life to give many years service.
  • No belts used – so eliminating vibration from
    this source.
  • Electricity supply required – 3 phase, voltage
    and frequency as requested.

Technical Details

Characteristic KK KKS KKF KKFS
Spindle code
- Power rating 1.1kW / 1.47 H.P. 1.1kW / 1.47 H.P. 2.2kW / 2.95 H.P. 2.2kW / 2.95 H.P.
- Height adjustment Fixed Adjustable Fixed Adjustable
- Air-flow (self-pressurised) No No No No
- Spindle nose designed for plate bore 50mm or 2" 50mm or 2" 50mm or 2" 50mm or 2"
- Spindle speed without inverter 2,850rpm @ 50Hz 2,850rpm @ 50Hz 2,850rpm @ 50Hz 2,850rpm @ 50Hz
- Weight 36kg 40kg 45kg 52kg
Electrical requirements 3 phase: 220v @ 60Hz or 220/380v @ 50Hz

Self-pressurised: Air-Flow Spindles - KK Range

Technical Details

Characteristic KKBS KKAS    
Spindle code
- Power rating 1.1kW / 1.47 H.P. 2.2kW / 2.95 H.P.    
- Height adjustment Adjustable Adjustable    
- Air-flow (self-pressurised) Yes Yes    
- Spindle nose designed for plate bore 50mm or 2" 50mm or 2"    
- Weight 50kg 58kg    
Electrical requirements 3 phase: 220v @ 60Hz or 220/380v @ 50Hz    

Standard & Air-Flow Spindles

OPTIONAL EXTRAS APPLICABLE
1. Spindle speed control inverter drive - speed control range Available 1,500 - 4,200 rpm
2. Bi-directional spindle rotation Available
3. Expanding nose Allows plate to be removed easily and centred
4. Expanding nose spanner To fit above expanding nose
5. Cast iron scaife plates Available - ask for details
6. Impregnated plates Available - ask for details
7. PB2 - Portable balancing unit Allows plate to be dynamically balanced in situ
8. Under bench filter for use with air-flow types Available
© 2016 COBORN ENGINEERING COMPANY LIMITED
Chesham Close, Cedar Road, Romford, Essex RM7 7PJ, UK
Tel: +44 (0)1708 744666 // Fax: +44 (0)1708 725187 // Email: sales@coborn.com
Registered Office: Spencer Fellows, 169 New London Rd, Chelmsford, Essex CM2 0AE, UK
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