- Joined
- Feb 13, 2017
- Messages
- 2,128
A little late to the party. . . again. Oh well. . . I concur that the tapped hole is probably M5. The source location of the motor, and specifications tend to indicate metric measurements.
As a rule, I am opposed to extending a motor shaft without welding on a section. And properly done, the rotor should be removed from the frame and trued on a lathe. Not practical in this situation, and my attitude is not a professional opinion. But the belt load is directly perpendicular to the bearing and puts a terrible load on it. Any extension should be made with that in mind. Lacking a proper shaft length, I would seriously consider a countershaft. If for no other reason than the ability to put a bearing on both sides of the pulley.
Consider a simple change of engine in a pickup. You wouldn't conceive of making an extension on a water pump shaft. You would find a water pump with a longer shaft. The same principle applies to the belt tension on a lathe. There is tremendous "side loading" involved and should be accounted for.
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As a rule, I am opposed to extending a motor shaft without welding on a section. And properly done, the rotor should be removed from the frame and trued on a lathe. Not practical in this situation, and my attitude is not a professional opinion. But the belt load is directly perpendicular to the bearing and puts a terrible load on it. Any extension should be made with that in mind. Lacking a proper shaft length, I would seriously consider a countershaft. If for no other reason than the ability to put a bearing on both sides of the pulley.
Consider a simple change of engine in a pickup. You wouldn't conceive of making an extension on a water pump shaft. You would find a water pump with a longer shaft. The same principle applies to the belt tension on a lathe. There is tremendous "side loading" involved and should be accounted for.
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