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e)Mount workpiece and lock it. For workpiece less than
put a center ring under it (No.38 in Fig.5);
f)Turn on the measuring circuit to check if the LED (No.38 in Fig.38) is work in
order.
Before measuring, it is required to check the workpiece position and make the internal
hole center coincident with the measuring axis. The method is as follows (see left scheme
in Fig.14 ):
Turn the transversal micro-active handwheel for worktable to make the hole center offset
slightly from the measuring spindle. Move lightly the measuring spindle to make the rob
approach the workpiece until the LED flashes, and record the reading (A
transversal micro-active handwheel to make the rob leave from the workpiece until the
rob approach the hole wall again. Record the reading (A
Calculate the average: A=1/2 A
the hole center is coincident with the measuring spindle.
Measuring steps:
Turn slightly the measuring spindle to make the rob approach the hole wall at one end
until the LED flashes and record the reading (L
slightly the measuring spindle in reverse to make the rob approach the hole wall until the
LED flashes and record the reading (L
check if the reading is changed. If not, take the average of (L
The measuring result for hole diameter is:
Fig.14
Principle for electrical measuring a hole
+ A
.Turn the handwheel to the reading (A) and now
1
2
¡
) . Now, let the reading return back to (L
2
D = L + d =
Where
d is the actual diameter of the rob;
£
£
) while the LED flashes.
2
) of the measuring spindle. Then turn
1
, L
) as L
1
2
L
L
+ d
2
1
¡
22
20mm, it is needed to
. Turn the
1
) to
1
.
1
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