Surplus Center responded today and said there was no centrifugal switch, according to their information.
Gear motor for drill press
- Thread starter MillWeld
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Surplus Center responded today and said there was no centrifugal switch, according to their information.
SPYDERLK
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Thanks! Learn something new every day. I looked them up. SC should not have used the generic "relay". That type of relay is expensive.
larry
SPYDERLK
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Well darn. Its buy an expensive relay or use one of the start options I sketched earlier if it wont start on just the run cap. :confused3:
larry
Al 2
Gold Member
Check out Rogue Fabrication https://www.roguefab.com/drillpressreduction.php for a simple jack shaft reduction. I saved this site a while back for a future project.
Al
Al
Well, here's a summary of my options:
1) use the AC gear motor: Surplus Center - 743 RPM 115 VAC INLINE GEARMOTOR but the relay info is ambiguous and the rpm I can get from it is about 200 and I would like about 100).
2) use a DC motor: Surplus Center - 350 RPM 90 VDC INLINE MINARIK GEARMOTOR but is more expensive, speed will allow me to get ~80 rpm, but then my max rpm is only ~400, too low.
3) go with a jackshaft. I would need about a 10" max step pulley to get ~100 rpm and I can't find one and I'm sure it is expensive if I ever do.
I guess I'm just hard to please.
Bob
1) use the AC gear motor: Surplus Center - 743 RPM 115 VAC INLINE GEARMOTOR but the relay info is ambiguous and the rpm I can get from it is about 200 and I would like about 100).
2) use a DC motor: Surplus Center - 350 RPM 90 VDC INLINE MINARIK GEARMOTOR but is more expensive, speed will allow me to get ~80 rpm, but then my max rpm is only ~400, too low.
3) go with a jackshaft. I would need about a 10" max step pulley to get ~100 rpm and I can't find one and I'm sure it is expensive if I ever do.
I guess I'm just hard to please.
Bob
Mendonsy
Veteran Member
The drill press shown on the roguefab website is exactly the same as the one I converted using an inverter drive and a 3 phase motor.
I think the inverter drive is a much cleaner solution and gives me a much wider speed range than the jackshaft setup, plus giving me the ability to reverse the spindle.
I think the inverter drive is a much cleaner solution and gives me a much wider speed range than the jackshaft setup, plus giving me the ability to reverse the spindle.
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dfkrug
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My large HF DP, the 20-inch "production" model, only goes down to 180 RPM. I
would like to get down to 80-100, ideally.
I picked up a free washing machine motor....it has 2 speeds. I have yet to try
it, however. The lower speed would work well, it would seem. Anyone try that?
would like to get down to 80-100, ideally.
I picked up a free washing machine motor....it has 2 speeds. I have yet to try
it, however. The lower speed would work well, it would seem. Anyone try that?
That was the first motor I put on my Jet ~35 years ago. It eventually died and I replaced it with a single speed. I missed the dual speed but in my case, going from 1725 to 1140 rpm wouldn't give low enough rpm. In you case it should work fine. Do it.
BTW I have orderd shafts and pulleys to make a jack shaft. I'm giving up on high rpm. Thanks for all the input.
Bob
Al 2
Gold Member
To add to the discussions, search ''DC treadmill uses'' or something like that. Many are used on lathes and drill presses.
Al
Al
I finished the jackshaft installation. The 5/8" keyed shaft is supported by two 1/2" x 1" steel bars. I get a 4:1 speed reduction giving rpms between 135 and 750. The only problem is belt slippage when sawing a 3" dia hole in steel and occurs on the smallest pulley (1.67" dia) on the cone above the large idler. There is no chatter when drilling but the slippage limits the torque; it took about 15 minutes to saw thru the 1/4" plate shown but it saws very cleanly. I've got the belt pretty tight and am afraid to tighten it more because the shaft is only 5/8"; I probably should have used a 1" shaft. The belts are old ones I have taken off old equipment so they may not have adequate friction. Would belt dressing help?
Bob
Bob
