Hi Paul, On page 15 of your book, you explain that if you allow grime and so forth to accumulate on the bedrails or cylinder bearings, you will see metal flakes appear on the bed rails.
I have been printing a book for the last few months, probably 300 press runs per day 3 days a week. In the last few weeks, I noticed these very accumulations starting to appear. I wiped everything down thoroughly, cleaned the hard felt blocks on the cylinder scraper assembly, but I keep seeing this little pile of flakes. I have taken to wiping the rails and cylinder every 100 runs, and I have noticed that the flakes and the thin grey film of grime is limited to the outside half of the rail and cylinder bearing.
Have I failed to properly adjust something? I am getting good, even printing on 100 lb paper. I have the kimlon blanket and a drawsheet (old paper tympan) for packing beneath a mylar tympan, and a single thin sheet of newsprint also in there, so I don’t think it is too heavy on the packing. (I don’t feel any resistance when I print).
Any insight or advice would be deeply appreciated. Like I said, printing is going great, but I am worried I am doing irreparable damage.
One heavily-used 219 I saw had metal dust coming off the roller bearing blocks (my vague memory is that these might have been the pre-nyliner brass variety). The blocks had been assembled incorrectly so that the oil holes were hidden, and so the rollers went without lubrication.
When you reassemble the bearing blocks, look for the numbers stamped on one end. Keep the pairs together and the numbers on the same end. The earlier brass blocks did not use Nyliners, but the later steel blocks do. With Nyliners, there should be a sheetmetal U-channel retainer to keep the Nyliner from slipping out. It is placed over the rim of the Nyliner on both sides.
They blocks should be positioned so that their oil holes are beneath the channels on the end of the lower frame.
A #3 Woodruff key (1/8″ x 1/2″) is a common fastener is a semi-circular disc. You should be able to find in a hardware store. You may need to clean the key way (channel) in the core and also sand the key to fit.
Possible causes: 1) Nyliners (bushings) for steel bearing bars are missing. Without them roller cores to rotate elliptically in the slightly larger bore. 2) Also without Nyliners, the cores may move laterally in the bearing bars. 2) One or both Woodruff keys, which aligns roller cores and gears are missing, set screws on gears collars may also be loose. Loose gears may slip and rub against the cores.