Reply by Derrick

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Posted on Keyed pulley, smooth shaft??

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103 posts in 1556 days

#1 posted 09-27-2016 05:43 PM

I m surprised the original setup has the same size pulley on both the motor and cutter. That will give you about 10,350 CPM with a 3450 RPM motor. I think 13,000 to 14,000 CPM will produce a cleaner cut. I assume the cutter is 3 blade.

- WhyMe

Well it does appear that another(thankfully inexpensive) mistake was made on my part. The pulleys are the same size. The manual doesn’t say much, but there are different part numbers for the separate pulleys.

I’m guessing the original owner gave me a pulley off of something else when I picked up the jointer. He gave me a couple bags of parts along with the jointer. I think he just found stuff laying around his shop. If that’s the case, no harm no foul.

So it appears in in the market for a larger drive pulley. I know there is some math involved on this one. If the driven pulley is 2.55in, how much larger of a drive pulley should I be looking for?

Surplus Center lists: 2.75, 2.95, 3.15, 3.35, 3.55, and 3.95 as the next sizes up on a 5/8 shaft. Will any of those get me to that 13k to 14k speed you’re talking about?

Just so I can gain some more knowledge, what is the math involved in determining that speed? That seems like a handy bit of info that’ll be useful in the future.

Thank you for catching my mistakes and for the help!!


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