SB 9C cone pulley diameters

Long Lonesome · Dec 16, 2005

Could someone tell me the large (chuck side) cone pulley diameter on their 6-spd 9" South Bend?

Mine has apparently had an outer ring added (spot-welded over the existing pulley) to increase the diameter to approx. 4-5/8". When I bought the lathe last weekend, I noticed there was no right side back-gear guard. I see now why it had been removed - I just got one and it will not fit over the largest cone pulley!

I prefer not to change the guard to fit this somewhat unsightly modification so if I can't get this ring off, I guess the next thing I'll be shopping for is a new cone pulley!

Thanks,

Greg

aametalmaster · Dec 16, 2005

I have an extra pulley, or i can fix yours...Bob

Long Lonesome · Dec 16, 2005

Bob -

Thanks for the reply. I may get back to you on that after I figure out what's going on here.

When I look at the corresponding (rt. side) pulley on the drive unit spindle, it appears that that one pulley has been reduced somewhat in diameter (haven't measured it yet) - which makes sense, since the circumference relationship between all three pairs must remain constant so that the belt will be under the same tension in all three speeds.

I wonder why someone would go through all the trouble to do something like this?

I restored a 1952 Ford tractor a few years ago. When you're working with some of this old machinery, sometimes you wish it could tell you what all it's been through!

Greg

Paula · Dec 16, 2005

Hi Greg,

The countershaft pulley steps on my lathe measure 3", 4", and 5" dia. The spindle pulley steps measure 2.25", 3.25", and 4.25" dia. I don't think they have ever been altered. Hope this is of some help.

Paula

William E Williams · Dec 17, 2005

You think that is bad? Somebody tried making mine a v-belt by butchering the headstock cone & replacing the motor cone with a bad immatation of a v-belt pully.

Ted

Long Lonesome · Dec 17, 2005

Paula -

Thanks for the info. That's just what I needed to know.

Also, I've been looking at some of the pics of your project, and I'm impressed - very nice work!
I hope to do the same with mine after I get all these little problems worked out.

Greg

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SB 9C cone pulley diameters

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