Service and Maintenance
3–18
Key Combinator Service Manual
10. Turn the key clamp knob counterclockwise (for left-handed
combinators, turn the key clamp knob clockwise).
11. Slide the key out.
Placing the key
in the gauge
To place the key in the gauge:
1. Insert the blade of the key into the key gauge frame. Secure the key
so that the key blade is flat against the back of the frame, and the
bottom of the key is against the base of the frame.
2. Adjust the key so that the spindle is centered in between the third
and fourth keycut, as shown in
3. Grip the thimble and slowly turn it clockwise to move the spindle
towards the key. When the spindle is touching the key and will not
go any closer, the key gauge produces a “clicking” sound; you can
stop turning the thimble.
Reading the
gauge
If you have an AD502D digital key gauge, read the measurement
displayed on the screen and skip to the section “Checking the
measurement.” For a manual key gauge, refer to
and
perform the steps below.
To read the key gauge:
1. On Scale 1, read the largest visible number. Each number on Scale 1
stands for 0.100
″
(one hundred thousandths of an inch). Each line
on Scale 1 stands for 0.025
″
(twenty-five thousandths of an inch).
2. On Scale 1, count the number of lines between the largest number
and the end of the thimble.
3. On Scale 2, read the largest number that is even with or just below
the centerline of Scale 1. Each line on Scale 2 stands for 0.001
″
(one
thousandth of an inch).
Figure 3.15
Inserting a key into the key gauge
Keycut
Spindle
Thimble
