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Post by rodwilson on Jan 3, 2008 16:17:04 GMT
I have just acquired a small power shaper. I need to mount the motor below a bench with the drive shaft, on a pivoted shelf, to adjust belt tension. Is the rotation direction important to the smooth running of this machine?
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Post by circlip on Jan 3, 2008 19:00:57 GMT
Serpantly is rod. If you take the cover off the machine so that you can see the wheel that the drive pin to the ram is fixed to,then the rotation is that the MAXIMUM arc of rotation is the forward stoke of the ram, and the return stroke is the MINIMUM arc of rotation. This ensures that the return stroke is quicker than the power stroke.
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steam4ian
Elder Statesman
One good turn deserves another
Posts: 2,069
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Post by steam4ian on Jan 3, 2008 21:40:30 GMT
G'day Rod
Cir Ian Clip is right regarding the speed of the ram. On many machines the ram is driven from an arm pivoted near the bottom of the machine. The crank pin engages a slider which slides along the arm (or a slot in the arm). The crank rotates so the maximum mechanical advantage and slowest speed is obtained on the forward (cutting) stroke; for a mechanism as described the top half of the arc will propel the ram forward and the bottom of the arc return the ram. There could be other arrangements using bell cranks etc but the mechanical principle will be the same.
Regards,
Ian
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Post by circlip on Jan 4, 2008 3:10:12 GMT
Hi again Rod, steam4ian Ian filled in space between the crank pin and the ram, I knew what I meant and it was clearly on the drawing I did for the wife in the pub tonight between the quiz rounds  Another other Ian. |
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Post by rodwilson on Jan 4, 2008 13:21:14 GMT
Thank you both for your prompt replies. I should have said that I am new to this forum and this sort of project. I am trying to get my workshop organized for retirement in a few months. I'll have a look over the w/e and hopefully I'll have it sorted. I really needed to have been in the pub and seen that drawing!
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Another other Ian.