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Reversing Direction on Drill Press

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TMAC

01-09-2002 03:39:14




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I thought about replacing one of the speed adjusting belts on my floor mount drill press with one that will allow me to figure-eight it so the drill will run in reverse. I want to use left-hand drill bits to remove broken bolts with more accuracy. Has this been tried or done by anyone?




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TMAC

01-10-2002 15:46:33




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 Re: Reversing Direction on Drill Press in reply to TMAC, 01-09-2002 03:39:14  
I hadn't thought about reversing the 110vac motor. I'll look at the motor for details but it won't be too often I'll need to drill out bolts so I may still go with simply putting on a belt that will figure eight. The press is new so I don't want to void any warranty. Thanks for your answers.



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G Taylor

01-09-2002 06:37:03




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 Re: Reversing Direction on Drill Press in reply to TMAC, 01-09-2002 03:39:14  
If it's a single phase motor with start windings all that's required is a common 4-way electrical light switch. Just extend the start winding supply wires out to the switch & back again to the windings. Flipping the switch swaps the start winding polarity relative to the run windings. Motor has to be turning slow or stopped with the centrifical switch closed for rotation to change. A three phase motor will attempt an instant direction change if two phases are changed while running. Not recomended under most circumstances however.

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JDR

01-09-2002 11:45:55




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 Re: Re: Reversing Direction on Drill Press in reply to G Taylor , 01-09-2002 06:37:03  
Making a figure 8 loop should work fine except for the maybe the belt wear. I doubt you will find you have a reversible 110 volt motor on the drill press if your drill doesn't have reverse already, it probably has a capacitor start motor not a split phase. Also a 3 phase motor doesn't have to be running to change direction swapping any to legs will reverse direction whether it is running or not.

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G Taylor

01-09-2002 13:07:26




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 Re: Re: Re: Reversing Direction on Drill Press in reply to JDR, 01-09-2002 11:45:55  
I'll bet you $100,000 it can be done JDR.
The single phase motor has to have a low inductance/high resistance start winding if it is induction start. The capacitor adds starting torque by increasing the phase angle between the run & start windings. The capacitor is just in series with the start winding & centrifugal switch. All you have to do is bring the leads out & swap the polarity of the start winding relative to the run winding. That's all you do when reversing the direction/terminals anyways. Just disconnect the wires where they feed the start winding & extend them to the fourway switch. Bring two new leads out from the start winding terminals. Attach them to the other pair of termials on the four way switch. Motor will reverse when when re-energized after the rpms are slow enough for the centrifical switch to close. A three phase motor can be reversed at anytime but the inrush current can wreak havoc on your or the local utilities power supply depending on it's capacity. In some machinery the torque loads when suddenly reversing direction can be damaging to the drives or machine.

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JDR

01-09-2002 16:55:23




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 Re: Re: Re: Re: Reversing Direction on Drill Press in reply to G Taylor , 01-09-2002 13:07:26  
G Taylor the man wants to change direction by twisting the belt into a figure 8. Apparently he is not well trained in the electrical field, so rewiring a motor as you spoke of probably isn't something for him to try. Admittedly I have never reversed a single phase motor that wasn't labeled to be reversed so you may be entirely right I don't dispute that 'cause I don't know. But in your first response it says 3 phase motors maybe reversed if leads are changed while running I agree this is not a good idea! Do it while motor is off it still works, is my point.

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Dusty

01-09-2002 04:57:03




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 Re: Reversing Direction on Drill Press in reply to TMAC, 01-09-2002 03:39:14  
Look at the wireing diagrams on the motor, some motors are reversable. If it is you will only have to add a special switch.
Good Luck,
Dusty



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F14

01-09-2002 04:25:49




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 Re: Reversing Direction on Drill Press in reply to TMAC, 01-09-2002 03:39:14  
Seems logical to me. Other than belt wear if it rubs at the crossover, I can't think of any reason why it shouldn't work fine.



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