chuck working now is not

[mbmmachining]

qt-10 universal 1984 t1 control
chuck was working fine then yesterday norning stopped working?
pedal switch is fine i checked.
air pressure fine.
what could it be?
any suggestions??

[bigbobomb]

could be a bad air soleniod

[mbmmachining]

i thought so too.
is there any way to check it?

[mbmmachining]

solenpid is fine.it works
what else could it be?

[bigbobomb]

Originally Posted by mbmmachining solenpid is fine.it works what else could it be?

are you sure that the drawbar or tube is moving in and out?

[mbmmachining]

nothing moves outside or in

[sfilippo]

Have you tried to open and close the chuck using the MDI M-code input option?

[mbmmachining]

i wish i could.
this machine for some reason doesn't have mdi or test option.

[Leelund]

Mechanical bind or siezure of the chuck jaws or the rotating cylinder piston is my next guess. At this point, probably going to have to remove the cylinder and draw bar. Test by hooking back up to the air lines and see if it moves left and right or in and out. If it's ok, move to the chuck and see if the chuck jaws move by sliding the center ring left and right. You might tap on the jaws with a rubber hammer and see if they move. The operating circuit works to the solenoid right? Only thing left to do is tear down. What brand and size is the air chuck? I may be able to aquire drawings. My 2 cents worth.
Lee.
P.S. Before doing the above, have you tried greasing the jaws and trying to operate back and forth at maximum air pressure?