SK-KK Scaife Spindle 1.1kW
Coborn Scaife spindles are precision instruments designed for years of continuous use for diamond polishing
SCAIFE SPINDLES FOR DIAMOND POLISHING
Coborn Engineering Co. Ltd. Have been producing Scaife Polishing Motors for the last 60 years. We have built up a well deserved reputation for only producing the highest quality motorised spindles and our motors are widely regarded as the best motors available on the world wide market. All of our motors are for use on an open topped bench.The motors, when at full speed, run with a low current (between 2-6 Amps) depending on power supply/work load/type. During start up, the acceleration of the motor up to full speed pulls a higher current, again depending on the above conditions and inverters/contactors used, should be motor rated, and tolerant to this fact. Acceleration from 0-3000 rpm without an inverter is approximately 6 seconds.
Features
Centralises scaife plate so rotational axis of plate and Rotational axis of motorised shaft are exactly concentric, allowing best possible balancing conditions, extended motor life, and less vibration
This motor is fixed height and can be set using spacers between the flange and the table top. The table hole for this motor must be 150mm, ALL Coborn motors are supplied with mounting bolts 2 Part Spanner Set to operate Expanding Nose, and top cap to hold skive plate in place.
The rotating parts are balanced to G0.1 (4x better than Gyroscopic limits) the faces are turned or ground to within 0.00001”. The motor can be run on 220V or 380V 3 Phase power, is fully height adjustable, Air Cooled and can be run through a frequency controller to vary and set speed accurately
Sk-KK Scaife Motor
• Fixed Height
• Expanding Nose – 50mm OR 2” OR 2”Taper
• 1.1kW
• 50/60Hz
• 220/380V 3 Phase input
• Can be run with Single Phase through a Coborn Inverter
OTHER TYPES OF MOTORS ARE AVAILABLE ON REQUEST, examples below
Sk-KKS Scaife Motor
• Adjustable Height
• Expanding Nose – 50mm OR 2” OR 2”Taper
• 1.1kW
• 50/60Hz
• 220/380V 3 Phase input
• Can be run with Single Phase through a Coborn Inverter
Sk-KKF Scaife Motor
• Fixed Height
• Expanding Nose – 50mm OR 2” OR 2”Taper
• 2.2kW
• 50/60Hz
• 220/380V 3 Phase input
• Can be run with Single Phase through a Coborn Inverter
Sk-KKFS Scaife Motor
• Adjustable Height
• Expanding Nose – 50mm OR 2” OR 2” Taper
• 2.2kW
• 50/60Hz
• 220/380V 3 Phase input
• Can be run with Single Phase through a Coborn Inverter
OLDER/OTHER TYPES OF MOTORS ARE AVAILABLE ON REQUEST CONTACT COBORN THROUGH THE WEBSITE
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Frequency Controlling Inverter Drive
For variable speed allows accurate speed control between 1,500 - 4,200 rpm housed in an earthed lockable box, with remote switching and an external braking resistor for controlled acceleration and deceleration protecting scaife motor bearings and extending life
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2. Bi-directional Spindle Rotation
For variable speed allows accurate speed control between 1,500 - 4,200 rpm housed in an earthed lockable box, with remote switching and an external braking resistor for controlled acceleration and deceleration protecting scaife motor bearings and extending life
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Bronze Expanding Nose
Supplied as standard on all scaife spindles allows plate to be mounted and removed easily by reducing undersize when loose, and oversize when tightened centres plates, even with a worn oversize bore, for best balancing conditions available in 50mm, 2 Inch, or 2” Taper Diameters
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Expanding Nose Spanner
To tighten or loosen the Coborn Bronze expanding nose | -
Cast Iron Scaife Plates
Available - See separate below | -
Impregnated Plates
Available - See separate below | -
Allows plate balance to be fine tuned in-situ, on motor removing virtually all vibration from polishing system visit here for more information
PB2 - Portable Balancing Unit
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Coborn Filter Kit for use with Airflow Motor Types
Consists of Filter Box, 2 Mesh Filters, Mounting Bars to attach box to bench, all ducting and pipe clips. Coupled with the table top shroud removes 98% of the Diamond Dust from the atmosphere
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Coborn Table top Shroud
Sited on top of bench, overlaps the scaife plate by 2mm, and guides ‘dirty’ cutting air into airflow motor flange, which takes Diamond Dust (self pressurised) through to Coborn Filter Kit or centralised extraction system
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Scaife Plates
Coborn can supply Diamond Impregnated plates which come in four grades. -
• FF – Fine grain final polishing
• MM – Medium grain polishing, for larger stones
• BB – Coarse grain for facet creation or stock removal
The impregnations are 2.5mm deep and each grain type contains a different size of diamond particles, thus giving the types different polishing properties (softer or harder etc.)
Particles in FF plate are all smaller than 20 Microns in size
MM Plate are all smaller than 40 Microns
BB Plate are all smaller than 60 Microns
The impregnation area is usually about 2-5 millimetres from the edge of the plate and extends inward by the desired amount. Obviously, the larger the ‘band of diamond’ the greater the cost. Band widths are available in several steps from 20mm – 80mm.
All plates from Coborn are balanced to perfection; there may be a slight vibration when used due to Mis-location but with EN nose this should not be apparent.
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Coborn also supply 3 types of cast iron scaife plates
Very small ‘pores’ (holes in metal), can only be used with small grain powders, for final polishing.
Extra Fine (Turbo)
Brinell Hardness Scale - Turbo – 450 HB Turbo
Vickers Hardness Scale - 485 HV Turbo
Rockwell ‘B’ Hardness Scale - 117 HRB
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Fine
Small pores, to be used for final polishing on stones less than one carat. Can be used with larger grain powder.
Brinell Hardness Scale - 250 HB Fine
Vickers Hardness Scale - 250 HV Fine
Rockwell ‘B’ Hardness Scale - 101 HRB
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Medium
Larger pores can be used with larger powder sizes, can be used for final polishing of stones greater than 1 carat or for quicker stock removal/blocking/facet creation.
Brinell Hardness Scale - 220 HB Medium
Vickers Hardness Scale - 220 HV Medium
Rockwell ‘B’ Hardness Scale - 96 HRB
These come in sizes either 330mm diameter or 310mm diameter, the 330mm size is perfect for our standard bench.
All plates from Coborn are balanced to perfection; there may be a slight vibration when used due to Mis-location but with EN nose this should not be apparent. -
Coborn can supply varying grades of Diamond powder and Specialised Cutting Fluid for Cast Iron Plate Preparation
Bore of plates will be true to 1/10 thousandths of an inch and correct for spindle nose size.
All plates impregnated or prepared plates must be worked-in/opened, prior to use, this is especially important for plates with a larger particle size, otherwise the stone will rip through the diamond paste/layer rather than running over it, thus cutting the diamond.
