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Selection principle: minimize the contact area between the cap-shaped measuring
accessories and the workpiece as possible.
The disadvantages are as follows if the contact area is too big:
Bring with error in adjustment. For example: During measuring a cylinder diameter with
1.5
8 cap-shaped measuring accessories, if there is a slight non-parallel between the two
¡
planes of the cap-shaped measuring accessories, this will make the measuring results
variable at different points of the cap-shaped measuring accessories. In addition, it also
£
cause the results unsteady if there is dirty and greasy between contact area during the
8
plain cap-shaped measuring accessories contacting with the workpiece surface. If the
spherical cap-shaped measuring accessories is applied, dirty and greasy will be removed
provided that the both moves relatively.
For different shape workpieces, the recommended measuring accessories are as follows:
Workpiece type
Cap-shaped measuring accessories recommended
Measure the distance
Spherical cap-shaped measuring accessories
between parallel
planes
Cylindrical parts
Spherical cap-shaped measuring accessories (move the
worktable to find the "turn-over point" as the highest
point of the cylinder)
Ball workpiece
£
£
2 or
8 parallel cap-shaped measuring accessories
(depend on ball size)
£
8 (when a pitch >5mm, using
14mm plain
Thread pitch diameter
with 3-pin
cap-shaped measuring accessories at one side)
Adjustment of cap-shaped measuring accessories:
a) Adjustment of spherical measuring accessories
The target of adjustment is to make the connection line between spherical centers of the
two cap-shaped measuring accessories crossing through the measuring axis. First, mount
a pair of spherical measuring accessories respectively on the tailstock and on the
measuring spindle, and make them contact with each other. Watch the reading on the
display during adjusting the screw (36 and 37) with the edge of a screw driver. Screw
shall stop at the position with maximum reading (i.e. "turn-over point"). After adjustment,
pull the measuring spindle to make these two measuring accessories impact slightly in
order to let the mechanism steady.
b) Adjustment for cutter-edge and spherical measuring accessories
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