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CUTTERMASTER Professional CM-01P User’s Manual
Page 23
3.7 Radius Grinding Basic Set Up
The CUTTERMASTER Professional and Toycen Air Spindle has been designed for corner radius (bull
nose) and ball nose grinding. Your attention to detail during set up is essential to your success.
As with any surface on the cutter, grinding a radius can be tricky: although a 0.0002” nick
won’t really affect the tolerance it will leave a blemish in your machined part.
The concept of this operation is that the grinding wheel and the tool must be located relative to the
tool spindle pivot point so that the radius is created as the tool is rotated past the wheel.
There is a key difference in grinding bull nose versus ball nose corner rads. That is as follows:
When grinding a bull nose you locate your wheel at angle in the y, x, and Z axes, set your indicators
to zero, then move the wheel away from center (pivot) the desired radius (eg. 0.150” for a 0.150” radi-
us), then bring the tool to the wheel using the x and y feed screws on the Radius Air carriages.
When grinding bull nose, you bring the tool to the wheel.
When grinding a ball nose, the center of the ball pivots at the center of the x,y pivot. You position the
tool on center then bring the wheel to the tool.
When grinding ball nose, you bring the wheel to the tool.
Bull nose: bring the tool to the wheel
Ball nose: bring the wheel to the tool
True and Dress the wheel
Before setting up for your radius, make sure that the grinding wheel is shaped, trued and dressed
using the Spindle Mounted Wheel Truing Device. It is important to know what part of the wheel is in
contact with the tool throughout the grinding process. To facilitate this we want the outside corner of
the wheel to be the farthest out with clearance on the inside. See section on wheel truing.
Recommended wheel prole
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