Speed reducer

[mickri]

I picked up a 30:1 speed reducer off of Ebay for my Dunlap bandsaw. Looks to be in excellent condition.



It has mounting holes on both the top and the bottom. Does it matter if it is mounted upside down. I am still considering how to mount it so that I have the correct rotation. You can turn the input shaft both CW and CCW. The output shaft turns in the same rotation as the input shaft.

 

[Ulma Doctor]

look for a vent on the gearbox.
if there is a vent, you'll want that at the top when it is mounted.

otherwise if there is no vent, you should be good to go in any position

 

[Hawkeye]

I used this 15:1 gearbox to set up my 1940s bandsaw. There's a third triple-pulley on the output of the box. Gives me 9 speeds from 28 to 500 SFM.
There's an oil filler plug on the top. It's mounted on an angle bracket from a previous application.

 

[mickri]

No vent that I can see anywhere. There look to be multiple filler plugs. At least one on each side of the reducer. If I have time tomorrow I will try to figure out how I can mate it to the motor. Famous last words "It shouldn't be too hard." The input on the reducer is a female 5/8 and the motor shaft is male 5/8. The two should fit together. The output shaft on the reducer is also 5/8 so the pulley from the motor should fit. The pulley is a quadruple pulley. The SFPM range should be 42 to 112 if I measured the pulleys correctly.

 

[Ulma Doctor]

there appears to be a flange missing on the 5/8" female side of the reducer.
the flange is the attachment method for the "C" face motor intended for use with the reducer.
the flange is not the only way to attach a motor, but it sure is convenient

 

[mickri]

I have the flange. I took it off because I didn't see a way to attach the motor to the flange. Once I get the motor and the reducer on the bench I'll be better able to figure out how to mate them together.

 

[Packard V8]

I picked up a 30:1 speed reducer off of Ebay for my Dunlap bandsaw.

Might be well to include the materials and thicknesses you plan on cutting with that speed reduced Dunlap. They aren't much for rigidity and the required blade tension for cutting steel might well be more than the frame can withstand.

jack vines

 

[Firstram]

No vent that I can see anywhere. There look to be multiple filler plugs. At least one on each side of the reducer.

One of those 1/4" plugs should be used for a vent, just pick the one that points up once the box is mounted.

 

[mickri]

The motor shaft slipped into the reducer and the pulley fit on output shaft. That is good to go. Needed a 1/2" spacer to align the reducer input with the motor output shaft. Made the spacer out of some plywood scrap I had. That's all for today. I need some longer bolts before I can put it together. Will pick those up the next time I go town. Should be done next weekend.

 

[mickri]

Finally got back to installing the speed reducer. I now have SFPM of 42, 56, 84 & 112.



I also recently got some casters for the stand. I did not make the stand. It came with the band saw. I used framing brackets that I had left over from another project to mount the casters to the 2x4 legs. Now everything in my shop is movable except for the lathe and the radial arm saw.