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I've sold my speed reducer and forgot to include the drive hub. Problem is, idk which one is the correct drive hub for the speed reducer. I've got 3 different hubs. 1 has a closed end with 4 grooves, 90° apart. Another is open all the way through and has 5 grooves. The 3rd one is longer than the other 2, the exterior steps down in size and it has 4 grooves. Could someone post a picture of the correct drive hub for me?

Tking308 wrote:I've sold my speed reducer and forgot to include the drive hub. Problem is, idk which one is the correct drive hub for the speed reducer. I've got 3 different hubs. 1 has a closed end with 4 grooves, 90° apart. Another is open all the way through and has 5 grooves. The 3rd one is longer than the other 2, the exterior steps down in size and it has 4 grooves. Could someone post a picture of the correct drive hub for me?

5 groove = driven shaft(SPT).

4 groove = driving shaft(headstock).

stepped is usually upper headstock shaft

closed is typically lower headstock shaft and short.

I am guessing the last one.

I store the drive hub on the unit as seen here:
Ed

I didn't have a picture of the 5 groove hub itself, but here is a picture of the mating end inside the end of the Speed Reducer.

Here's a picture I found - To help OP (clarification )

JPG wrote:

Tking308 wrote:I've sold my speed reducer and forgot to include the drive hub. Problem is, idk which one is the correct drive hub for the speed reducer. I've got 3 different hubs. 1 has a closed end with 4 grooves, 90° apart. Another is open all the way through and has 5 grooves. The 3rd one is longer than the other 2, the exterior steps down in size and it has 4 grooves. Could someone post a picture of the correct drive hub for me?

5 groove = driven shaft(SPT).

4 groove = driving shaft(headstock).

stepped is usually upper headstock shaft

closed is typically lower headstock shaft and short.

I am guessing the last one.

jjj240 wrote:Here's a picture I found.

JPG wrote:

Tking308 wrote:I've sold my speed reducer and forgot to include the drive hub. Problem is, idk which one is the correct drive hub for the speed reducer. I've got 3 different hubs. 1 has a closed end with 4 grooves, 90° apart. Another is open all the way through and has 5 grooves. The 3rd one is longer than the other 2, the exterior steps down in size and it has 4 grooves. Could someone post a picture of the correct drive hub for me?

5 groove = driven shaft(SPT).

4 groove = driving shaft(headstock).

stepped is usually upper headstock shaft

closed is typically lower headstock shaft and short.

I am guessing the last one.

Either of the two in the center with the 5 grooves. Look at br549's picture. It requires a 5 groove hub. The length does not matter.

jsburger wrote:

jjj240 wrote:Here's a picture I found.

JPG wrote:
5 groove = driven shaft(SPT).

4 groove = driving shaft(headstock).

stepped is usually upper headstock shaft

closed is typically lower headstock shaft and short.

I am guessing the last one.

Either of the two in the center with the 5 grooves. Look at br549's picture. It requires a 5 groove hub. The length does not matter.

I don't recall ever seen different size in 5 groove (headstock side).
I've seen different length in 4-groove though... as seen in the picture.

jjj240 wrote:

jsburger wrote:

jjj240 wrote:Here's a picture I found.

Either of the two in the center with the 5 grooves. Look at br549's picture. It requires a 5 groove hub. The length does not matter.

I don't recall ever seen different size in 5 groove (headstock side).
I've seen different length in 4-groove though... as seen in the picture.

I have never paid any attention. I have lots of hubs here. It just looked like in the picture the two 5 groove hubs were different lengths. Camera angle.

4 GROOVE - stepped like the pix above / short, open both ends and closed on one end / long but full diameter and grooves the entire length(power station only???). Always 5/8" id.

5 groove - two different bore diameters - 1/2" and 5/8".

The short 5 groove was initially(greenie vintage) somewhat round shaped(ends rounded off).


Any others???