Posted: Tue May 08, 2012 7:17 pm
We have discussed many things about this but I am not all that great at finding the old stuff.
Have these units been tipped to drill press mode and lubed and left sitting like that overnight to get oil in the yoke bearing? I have never noticed mine getting all that hot but then I don't run it a lot so I just can't say. Has anybody felt around to see where it burns your fingers the most?
There are several possibilities for operating the speed control without using the rotating cam. One is to use a lever/bellcrank system. A locking T handled control like used on such things as dump truck hydraulic systems could also be used.
One concept that I like is making a wedge shaped cam instead of the round one and using a threaded rod to push it forward or pull it back. Basically it would be a lot like taking the round cam and just straightening it out. One would very easy to machine with simple equipment.
The whole cam concept is pretty simple and there is a long history of such controls on all kinds of equipment. The variable speed drives of a self propelled combine normally use a small hydraulic cylinder to push / pull the movable sheaves. Some of the real old ones used a long threaded rod with a crank on the end sticking up through the cab floor someplace.
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Have these units been tipped to drill press mode and lubed and left sitting like that overnight to get oil in the yoke bearing? I have never noticed mine getting all that hot but then I don't run it a lot so I just can't say. Has anybody felt around to see where it burns your fingers the most?
There are several possibilities for operating the speed control without using the rotating cam. One is to use a lever/bellcrank system. A locking T handled control like used on such things as dump truck hydraulic systems could also be used.
One concept that I like is making a wedge shaped cam instead of the round one and using a threaded rod to push it forward or pull it back. Basically it would be a lot like taking the round cam and just straightening it out. One would very easy to machine with simple equipment.
The whole cam concept is pretty simple and there is a long history of such controls on all kinds of equipment. The variable speed drives of a self propelled combine normally use a small hydraulic cylinder to push / pull the movable sheaves. Some of the real old ones used a long threaded rod with a crank on the end sticking up through the cab floor someplace.
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