I undertook the arduous task of adjusting the 6 cylinder carriage bearings on my SP15, after still experiencing uneven inking and impression with newly recovered rollers.
Thanks especially to Gerald’s comprehensive “Adjusting Cylinder Carriage Bearings” article, without which I never would have undertaken the ordeal:
And with Fritz’s recently found comments within Paul’s “Common Operator Errors” article, I may get even closer to nearly perfect impression adjustments:
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My problem is I find the upper/front/non-operator side bearing (X-12232) no longer spins freely after re-tightening the bolt head after adjustments, whereas it does by just hand tightening it.
All other 5 bearings spin easily after my adjustments are done and the bolts are torqued down. Could it be that the shaft/pin holding this bearing into the carriage wall may be warped and ends up squeezing the bearing to the rail at the final tightening? I don’t own a torque measuring wrench but I know I’m not tightening this offending bearing any more than the others.
Any insight appreciated.
. . .
SEPARATELY and to clear further confusion:
After reading all articles and then adt’l comments in Ron’s May 21, 2011 “Cylinder Carriage Bearings Questions” article, I’m still unclear with the terminology. Each time “TRIP” or “IMPRESSION” is used in reference to the bearings, it is never clarified if we’re dealing with bearings ABOVE or BELOW the rail.
Please correct the following if I’m wrong:
– I’m left with the understanding that the IMPRESSION bearings are situated UNDER the rail, they control the amount of impression by squeezing the carriage tighter/looser to the rails while printing and get adjusted in PRINT MODE
– whereas the TRIP bearings are situated ABOVE the rail, they control carriage and roller assembly height, and they get adjusted in TRIP MODE.
I think I and many other owners would greatly benefit from clearing up this confusion. Thanks for all your help and comments, past and future.