SIZE Maximum wheel diameter for accurate wheels
is 200mm. Maximum diameter for less accurate wheels
is 600mm. Maximum wheel width around 250mm.
For best results a purpose built creep-feed grinding
machine must be used incorporating a Mechanical Table
Drive unit and infinitely variable table speed control.
Hydraulic systems should be avoided.
Coolant supply of 100 litres per minute is essential.
Coolant jets should be positioned with the direction
of cut, opposed to the direction of cut and at 180 deg
to the point of cut. Best results can only be achieved
when having these three supply points. Coolant must
be perfectly clean and free from any grinding waste.
Centrifuge systems or Diatamaceous Earth Tower systems
are suitable, preferably with a final clean through
a paper filter. Coolant type directly affects wheel
performance. For carbide grinding we recommend the following:
FINISH Accurate wheels will achieve 0.3/0.6mm (16CLA)
with standard grits. After bedding-in the finish will
ANGLES We have a number of experienced tooling engineers
within our Engineering Department. Using software specially
developed as well as commercially available programmes,
they are able to re-calculate for Front and Side clearance,
Top Rake, Helix Angles and Tilt, or a combination of
these. This ensures that after grinding profile geometry
is correct when the tool is presented to the workpiece.
We can advise on fixturing to achieve any of the above.
LIMITATIONS Minimum Radii:
Standard Wheels 0.1mm. Specials 0.07mm. Male:- Standard
faces will produce a rubbing action and reduce wheel
life. Where possible the form should be tilted to avoid
GRINDING Cranden wheels can be used to produce Circular
Form Tools. A 50mm tool will take around 14 minutes
to grind from solid. The wheel must grind at full depth
DISTORTION If used correctly the wheel form will
not deteriorate throughout the life of the wheel. Causes
of distortion are: Pendulum Grinding, Inadequate or
dirty coolant, Poorly considered Roughing or Presintering.
TIMES The entire manufacturing process is carried
out in-house. We can manufacture a completely new wheel
within 3/4 days where necessary. Standard deliveries
are 2/3 weeks. Repeat wheels or replates take 10/14