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Old 11-06-2005, 09:24 AM   #1 (permalink)
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Slowing down drill press speed

My variable-speed drill press will not slow down sufficiently to allow the effective use of large drill bits. I'm guessing that the slowest speed is about 600-700 RPM. I'd like to hook a rheostat on the power cord to accomplish this. As I remember, you can only use a rheostat on certain types of electric motors. The motor in question is a Baldor 1.5 HP single phase motor. Any help would be appreciated.
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Old 11-06-2005, 09:29 AM   #2 (permalink)
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Vfd?
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Old 11-06-2005, 09:49 AM   #3 (permalink)
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variac?

or a pully change...
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Old 11-06-2005, 09:56 AM   #4 (permalink)
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Sell it and pop for a new drill press that can get even slower. A good rheostat/variable speed controller would probably cost as much.

I bought one of the Chinese made Tradesman 12" drill press from Lowes, that can go down to 250rpm. Only $119, and it's does pretty good.
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Old 11-06-2005, 10:06 AM   #5 (permalink)
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Quote:
Originally Posted by tdavis
Sell it and pop for a new drill press that can get even slower. A good rheostat/variable speed controller would probably cost as much.

I bought one of the Chinese made Tradesman 12" drill press from Lowes, that can go down to 250rpm. Only $119, and it's does pretty good.
Thanks, but I think I'll just hang onto my old 350+ LB drill press, in lieu of getting a "better" Chinese-made one. I'll figure out some way to make that thing run slower.
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Old 11-06-2005, 10:34 AM   #6 (permalink)
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You need to fab a new pully setup. Someone here has done this, it's not rocket science. I would think an extra idler would be all you need. Variable pulleys are available at Grainger, surpluscenter.com etc.

You don't want to mess with your motor anyway. Let it run at it's normal speed, it's designed for that. Use pullies to do it. Especially if you have a big ol drill press.

This would be a great little project and one I am thinking of doing myself, but I have no time anymore. Mine goes down to 240 and that's ok, but I like slow slow slow. I'd like to have 80rpm available.

One thing is my cheap ass chuck isn't capable of handling a strong feed at low rpms on big drills. But it sounds like you have a big quality unit. Something to think about though.
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Old 11-06-2005, 12:22 PM   #7 (permalink)
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IMO a VFD is not a good idea... its a good way to wreck a perfectly good motor. It needs to be rated for drive use because of the extra stress it puts the windings through.

A variac is fine for power hand-tools and certain fans because of the motors they use... not for a split-phase/capacitor motor.

Many drill presses use a 4-pole motor... that yield slightly under 1800rpm. You could try to find a used 6-pole motor - <1200rpm, or an 8-pole motor - <900rpm.

Meesing with the pulleys is probably the cheapest if you like to tinker. Most presses just have two, but some have 3 (a middle stepped idler) for more speed range.

EDIT: its easy to post redundant info when it takes me over 2 hours to complete a post
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Old 11-06-2005, 01:02 PM   #8 (permalink)
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The right way to do this by adding a jack shaft to your drill press.

Here is an example of how....

http://www.frugalmachinist.com/jackshaft.html




.
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Old 11-06-2005, 04:57 PM   #9 (permalink)
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does adding a VFD lower the HP, you said you want to turn larger drills i would not want to lower my HP and try to turn larger drills, kinda counter productive, but if it does not rob any HP then i say try it, but dont burn out a good motor eather, jason.
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Old 11-06-2005, 05:21 PM   #10 (permalink)
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Note: Variable frequency drives are for 3 phase motors.
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Old 11-07-2005, 04:59 AM   #11 (permalink)
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/forum/shop-tools/311507-drill-press-crawler-gears-oh-ya.html

I want to do this!!!
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