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TB107 Rev1 Adjusting ATC Tool Pullstud Clamp
Overview
This is a step by step procedure for adjusting the tool pullstud clamping mechanism such as the one found on
the Atrump B5 and B6 ATC bedmills Â
Problem
On several of the Atrump ATC mills the tool holders will not release properly from the spindle taper This is
caused by an improperly adjusted pullstud clamping mechanism located on the spindle Follow the procedure
below to correctly adjust the tool clamp Â
Procedure Â
1 Remove the side panel of the spindle cover from the spindle This will give you access to the tool clamping
assembly located above the spindle cartridge View figure 1
2 Unplug the electrical connector from the spindle air blow through solenoid located on the left side of the
main column on the mill This will be the only solenoid valve that has a port capped off and should be the first
valve in the solenoid pack as illustrated in figure 2
This will prevent the spindle blow through from interfering
with the tool clamp adjustment
3 Loosen the two small cap head screws on each side of the large end adjustment bolt located on the bottom
end of the air cylinder shaft as illustrated in figure 3
This will allow the large center bolt to be adjusted
4 Insert a tool holder into the spindle while holding the tool clamp/unclamp button located on the front right
hand side of the spindle housing Â
5 Release the tool clamp/unclamp button and make sure the tool holder is securely held in the spindle Â
6 Turn the large end adjustment bolt located on the air cylinder shaft until the tool holder held in the spindle
moves at least 1/16" away from the spindle when ever the clamp/unclamp button is pressed but not more
than 3/32" from the spindle Refer to figure 4
After you have made the proper adjustment the tool holder
should release easily from the spindle when the clamp/ unclamp button is depressed There should always
be a gap between the large adjustment bolt and the top of the spindle when the clamp/unclamp button
is not depressed because the bolt remains stationary and the spindle rotates if there is not then you
have adjusted the large bolt too far down!
7 Tighten down the two small cap head screws on each side of the large adjustment bolt reinstall the spindle
housing side cover and reconnect the spindle blow through solenoid connector on the rear column This
completes the adjustment
Document History
Rev1 Created on 2001 01 05