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Rethinking the Need for Pulley Steps with VFD on Drill Press

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Forum topic by bill1608 posted 06-28-2017 05:15 PM 319 views 0 times favorited 0 replies Add to Favorites Watch
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bill1608

12 posts in 1013 days


06-28-2017 05:15 PM

I have a couple drill presses that I am going to convert to VFD. I NEVER considered having one belt step acceptable. But I am rethinking that now for my applications. On my 15” drill press, I can get a spindle rpm range of 6-1 using a 2 hp 1750 rpm motor and still have 1/2 hp at the minimum speed. I can accomplish the 6-1 ratio by overspeeding the motor by 50% (90 hz). On that drill press, I would size a single motor pulley running with the largest front pulley to get 333 to 2000 rpm. On my 17” drill press, I can do a similar method and get 9-1 by using a 3 hp motor. Using a single motor pulley with the largest spindle pulley, I can get 222 to 2000 rpm and still have 1/2 hp at the lowest spindle speed. I consider these speed ranges and hp’s acceptable for these drill presses for my applications. I will probably also use an A belt instead of a 4L belt just for the heck of it. That may not be necessary because my motor pulleys will be at least 5 1/2”, so the belt speed should be fine for the load. The load shouldn’t ever exceed about 1/2 hp. The key to doing all this is using an oversize motor, overspeeding the motor (for the higher spindle speeds and speed range) and not using too small a motor pulley that can’t transfer the power at low speed.


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