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Slowing drill press

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Sam

03-30-2002 18:47:15

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What would be the best way to slow down a drill press. I would also like to make it reversable if possible. Thank you

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03-31-2002 10:59:49

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Re: slowing drill press in reply to Sam , 03-30-2002 18:47:15

I use the following method to slow down drillpress spindles- Remove the existing drive belt and one pulley from the press, put the pulley back on opposite to the way it was. Get another step pulley that matches the two on your press, fit a vintage style water pump repair shaft with bearing to the bore of the new pulley, machine a holder for this new shafts' bearing sleeve that will slip-fit into the the inside of drillpress column with a step at the top to keep it from dropping into the column, bore a hole as off-center as possible along the length of this new part that will accept the O.D. of the water pump bearings' sleeve and fix the bearing w/shaft to the holder with a set screw. Now install the new step pulley onto the shaft and figure your new belt sizes, you'll need two-one for the motor to column pulley and another to go from there to the spindle, most presses will take two of the same length. Now you can loosen the motor and swap belts around to get your desired spindle speeds and the eccentricity of the column pulley mounting allows for tension adjustment of the spindle belt.

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Al English

03-31-2002 04:54:37

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Re: slowing drill press in reply to Sam , 03-30-2002 18:47:15

Hi Sam,

As Tom pointed out, pretty much any motor can be reversed by wiring in an appropriate switch.

I have an old, very well made, drill press that I like very much. But just like yours, it can't be slowed down enough for some jobs. Here's what my research revealed. If you have a 3450 RPM motor, switch to a comparable 1725 RPM unit. This may or may not be an issue for you, but two speed motors are very inefficient(low torque and relatively high power consumption) when running in the low speed mode. If you can find a way to do it I suggest the speed reduction be done by installing either different pulleys, or adding an intermediate set of pulleys which will permit an additional reduction in ratio. If you don't like the drill press enough to invest that much time and effort into it, look for a replacement that is closer to what you want. Good luck...Al English

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Tom

03-30-2002 20:49:07

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Re: slowing drill press in reply to Sam , 03-30-2002 18:47:15

To reverse you need a reversing motor and a reversing switch. To slow one down you can get a two speed motor, about 1100/ 1725 rpm. Or you can add a larger pully to the lower spindle pully or the larger pully on the idler if it has one. To do this you need to get a larger diameter pully, bore it out to fit over the pully it will replace, then with a 1/8" plate of steel make a splice between the two. There is probably enough metal in the original pully for a series of small socket head capscrews at the base of the V without drilling and tapping through into the V belt area. You end up with two circles of screws, one in each pully, with the plate joining the two pullys. The two pullys are on the same plane so belt alignment is still the same. The best place to do this is on the spindle pully as increasing the diameter here will have the most benefit as far as taking strain off of the belt and decreasing slippage, however it is easier to do to the idler if you have one. Doing the spindle usually means taking off the belt guard too, don't know how you feel about that. Of course this can be done to both pullys too for even more reduction.

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franki

04-07-2002 09:44:45

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Re: Re: slowing drill press in reply to Tom, 03-30-2002 20:49:07

sounds like another home for tread mill moter--come on guys go D C ----- --but some of older drills and imports to have a slow speed pulley attachment--that goes between existing pulleys-unless you are a mechanic I say- go get a new drill press because the 5/8 capacity are cheap at any farm store such as Tractor Supply now TSC

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steve

03-30-2002 20:59:19

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Re: Re: slowing drill press in reply to Tom, 03-30-2002 20:49:07

put a larger diameter pulley on the spindle or a smaller pulley on the motor. the motor turns proabably 1750 RPM. Measure the pulley on the motor and divide by the diameter of the pulley on the spindle. Multiply this by 1750 to gt spindel speed. Your speed should be about 400 -800 RPM roughly. example. you have a 2 inch pulley on the motor and a 6 inch pulley on the spindel 2/6 = 1/3. and 1/3 of 1750 is about 585 RPM on the spindle. If the motor is 3300 RPM, then you can change it to a 1750 and probalby fix the problem. Next, why run backward??

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Jim K

03-31-2002 05:23:23

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Re: Re: Re: slowing drill press in reply to steve, 03-30-2002 20:59:19

Reversing a drill press is real handy when tapping steel. I was able to make a craftsman drill press reversable by wiring in a double pole double throw small toggle switch, which fit right in the connection box that's on the motor of the unit.(fairly easily) now I can drill and tap.
Jim K

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03-31-2002 10:27:51

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Re: Re: Re: Re: slowing drill press in reply to Jim K, 03-31-2002 05:23:23

Reverse is necessary when drilling out broken studs, bolts, etc. with left-hand-twist drill bits.

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