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96-5047 rev L June 2005
Clamping Force and Air Supply
The A6AC is a 1-3/4 diameter thru-hole type closer which is adjustable from the rear. It holds parts by utilizing
spring force to provide up to 0.125 of longitudinal movement and up to 5000 lbs. of draw force at 120 PSI shop
air pressure.
Adjustment
To adjust the collet closer, align a collet with the keyway, push the collet into the spindle, and turn the drawbar
clockwise to pull the collet in. To make the final adjustment, place a part in the collet, turn the air valve to the
UNCLAMPED position to charge the cylinder and compress the spring mechanism, then tighten the drawbar
until it stops. Back off 1/4 - 1/2 turn and turn the air valve to the CLAMPED position. This will be adjusted for
maximum clamping force. To reduce the clamping force, back off further on the drawbar or regulate the air
pressure down before adjusting.
Collet Sticking
NOTE:
To prevent excessive wear and collet sticking, make sure collets are in good
condition and free from burrs. A light coat of Molybdenum grease on the collet
wear surfaces will extend the life of the spindle / collet and help prevent
sticking.
When the air supply is turned on, the drawbar is kicked forward and releases the collet. Increasing the air
pressure can help stop the collet sticking; however, do not exceed 200psi into the cylinder. Backing off further
on the drawbar during final adjustment may also reduce collet sticking.
WARNING!
Do not index the Rotary Table while the A6AC air valve is in the ON
position. This will put excessive friction on the worm gear system
and cause premature wear.
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