Stacker; Starwheel Adjustment - IBM 29 CARD PUNCH Maintenance Manual

4. Place the machine in numeric shift and time the
automatic duplication of 80 columns (using punched
cards). Timing should be 4 to 4.5 seconds.
5.
If timing exceeds the limit, slow action is due to the
interposer magnet assembly:
a. Excessive magnet-to-armature air gap.
b. Interposer bail contacts.
1.7.3 Stadter
The base should not be raised or lowered by using the
stacker plate as a handle; relative position of the stacker
plate to the stacker assembly may be changed and may
require readjustment. Improper adjustment of the traveling
card guide can cause difficulties in reading the end portion
of a card.
1.7.4 Starwheel Adjustment
The 29 Card Punch is designed so that the starwheel
duration is about 9 ms. One tooth on the escapement wheel
equals 12 ms. This timing is critical because too much or
too little duration could cause relay points to arc. This
could be compounded if the relays develop a tacking
condition.