Vandercook No 4 cylinder alignment

The cylinder check spring broke on our No. 4. I got a replacement spring from Fritz and the press is printing again. My question is concerning the position of the cylinder at the feed table. With the cylinder at the feed table, the grippers are at about the 12 o’clock position (just a little before – say 11:59). In both trip and print the cylinder will rotate very easily before you get to the position where you can feel a small resistance which I presume is the complete engaging of the cylinder/form rollers with the rails. This small rotation is only from the 11:59 position to about 12:02. I don’t remember this occurring prior to replacement of the spring. Is there an adjustment that I need to make at this point? This is an older No. 4 – a 1940 version according to Fritz’s record.

John Johnson

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Paul Moxon, Moderator
Admin
7 years ago

Great news. This one was hard to diagnose online. The top of the block should have an oil hole to lubricate the bore that contacts the shoulder of the bolt.

Paul Moxon, Moderator
Admin
7 years ago

To raise the grippers adjust the set screw first, then if that doesn’t make a difference, turn the fulcrum screw to the right 180°.

Paul Moxon, Moderator
Admin
7 years ago

It’s possible that the cylinder is off one tooth off. Even so, at your12:02 the cylinder shouldn’t have advanced far enough to clear the ink drum. Only after it does so will the trip rack and its cam follower run up the trip wedge causing the cylinder to shift into print mode. See my photo showing how far the carriage has moved and the cylinder has rotated before shifting into print.

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