Ink Drum on #4

The ink drum on the recent #4 was frozen in place–bound up by years of uncleaned ink, and it was also in contact with the operator side of the recess where it sits.  After much penetrating oil and some heavy manual ink removal, I loosened the lock nuts on either end of the drum, and the screws they lock, to center it and free it from the bind.  The drum spins freely now, is cleaned of build-up on the ends and around the chain, and doesn’t strain the motor; however, after centering the drum, it consistently migrates back to the operator side of the press when the motor is on.  I can push it back to center with a screw driver while the motor is running, but it then migrates back to the operator side of the press.

I don’t want to strip or round off the lock nuts on the drum; is the solution simply more torque?  Otherwise all seems to be good.  Will look forward to reading thoughts and ideas, and thanks.

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Paul Moxon, Moderator
7 years ago

The cones Jonathan mentioned are the wooden bearings (F-760). It could be that they have slid into the drum. A note on the assembly drawing says that the bearings should extend 1/64″ outside the drum.

Jonathan Jarvis
7 years ago

There is a danger perhaps that oscillation will have worn the cones to an uneven profile, and made worse by lack of lubricant in these bearings, which would only worsen if not checked out.Also may cause inking problems of you are relying on inking rollers putting pressure on the ink drum to keep this “level” , thus increasing wear on everything.

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