Two types are available in either natural or synthetic
diamond.
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CONICAL CLEARANCE
Representing the ultimate controlled waviness characteristics for this
product group, Contour's conical clearance tools have a truly
circular
edge, guaranteed to be within 0.4µm and
often in the order of 0.25µm. Tools can be manufactured with
nominal radii of 0.1-1.0 mm.
It should be noted that as standard, these tools have a 12.5° clearance
angle and 100° of arc. Increased arc is available. 120° or
more must be manufactured using a synthetic single crystal diamond.
The accuracy of conical clearance is only seen when a 0° rake is
used. |
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CYLINDRICAL
CLEARANCE
Where a relaxed work piece geometry can be tolerated, Cylindrical Clearance
tools offer a suitable alternative. Cylindrical clearance tools have an elliptical
form, which is proportional to radius size, clearance angle and rake angle.
For example: for a 0.5mm radius,
100° arc, 12.5° front clearance and 0° rake will have
an elliptical form deviating from a true circle by 0.4µm. This
figure does not include manufacturing tolerances. |
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