b
13. Proximity switch adjustment and replacement (fig. 13.1)
Proximity switch is operated by the projected ‘switching area’ on gear wheel (85); and indicates that the turret
is in clamped position. Actuation of the switch is indicated by built in LED (light emitting diode).
Operation of the switch can be checked by hand-cranking the turret. (refer page 11), crank motor shaft to
index the turret through 360°. Turret will pass through cycles of declamp-index-clamp; and your hand can
feel the pressure during ‘clamp’ phases.
Proximity switch LED should light up during all these ‘clamping’ phases. Flickering of the light, or
inconsistency of LED operation will be an indication of faulty proximity switch.
14. Replacement of proximity switch :
* Bring the turret in clamped position by hand cranking.
* Proximity switch is approachable after removing back cover (60). Switch is held in a clamp (153), and the
clamp is bolted to the turret body by socket head screw (154).
* Remove screw (154), and take out proximity switch along with its clamp. Measure distance ‘a’ by vernier,
and note it down. Loosen clamping screw (155), and remove switch from the clamp.
* Measure distance ‘b’ between the clamp seating surface, and the sensing surface on gear (85) by using
a vernier or a depth gauge. Distance ‘a’ by which the proximity switch projects out from the clamp should
be adjusted to give a gap of 0.8 to 1 mm.
* Place new switch in position. Crank turret by hand, and check the function of switch by watching the signals
on the built in LED.
a
152
153
156
LED
III
III
V
V
85
GAP 0.8 mm
154
155
60
FIG 14.1
MODEL
Dist 'a'
BTP-125
25.5
BTP-100
25.5
BTP-80
22.5
BTP-63
23.5
BI-DIRECTIONAL TOOL TURRETS 15
