Yesterday I needed to drill a some holes in a pair of grinding wheel nuts and I chose to use my dainty imperial Hercus mill for the task. ( The other mill, little but not dainty, is metric and this was an inch job.) Then I remembered why it has sat forlornly under a sheet for four or so years now. After a few minutes of running, the spindle in the mill's vertical head had become nearly too hot to touch. I had mentioned this in the Hercus forum a few years back and Bruce "Abratool" informed me that his mill's head ran cool. It ran cool because it had no seals. With no seals mine too runs cool. No seals would necessitate the wearing of a plastic raincoat or in Bruce's case, a wetsuit.
The original seals are single lipped, steel cored with a garter spring. With the springs removed the heat persists. Hercus used Flaseal 13297 seals. I replaced the originals with NAK seals. They measure 2.500" x 1.875" x 0.375". This morning I had a look for PTFE seals but without success.
I imagine Hercus used lipped seals on the head to retain the oil more than to exclude dust and swarf. The No.1 T and C grinder utilises labyrinth seals to do both but the spindle is horizontal.
Can anyone suggest an alternative to the lipped seal?
Bob.
The original seals are single lipped, steel cored with a garter spring. With the springs removed the heat persists. Hercus used Flaseal 13297 seals. I replaced the originals with NAK seals. They measure 2.500" x 1.875" x 0.375". This morning I had a look for PTFE seals but without success.
I imagine Hercus used lipped seals on the head to retain the oil more than to exclude dust and swarf. The No.1 T and C grinder utilises labyrinth seals to do both but the spindle is horizontal.
Can anyone suggest an alternative to the lipped seal?
Bob.
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