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Old 05-23-2017, 07:55 PM
crystallographic crystallographic is offline
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Join Date: Dec 2010
Location: Western Sierra Nevadas, Badger Hill, CA
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Default Campbell 2536-6 nibbling machine rebuild Part 3

The business end of the main shaft is two pieces, with the shaft end counter-bored to receive the eccentric insert, which is adjustable.
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The eccentric can be advanced for a longer stroke or retarded for a shorter stroke. These 3 strokes, combined with the two sheave speeds and the collet height adjustment, allows for metals from .025 to .250 to be nibbled smoothly.
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The plunger bearing is bronze with a lengthwise split at 10:00, and is pinned in place. Another (bronze) pin with flats on one end keeps the plunger aligned while it reciprocates.
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Shims allow for compression on the bearing.
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The hollow cap screw retains the plunger alignment pin.
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The fork engages the collet end, while the threads raise and lower the collet.

Up on top, the hand knob raises and lowers the collet in increments determined by the detents - IF the spring is awake and ready. Some penetrant awakened the spring, which took the dentent cap with it. Both were located nearby.
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Detent cap up proud with a new spring and lube in the spring bore.
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- end of Part 3 -
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http://www.tinmantech.com

"All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919.

Last edited by crystallographic; 05-23-2017 at 08:00 PM.
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