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Re: Mark V Control Sheave Replacement Issue
Posted: Sat Dec 19, 2015 7:43 pm
by JPG
Teggy wrote:wa2crk wrote:Did they include the spacer that is supposed to keep the new style bearings separated?
Bill V
No spacer included. Just the new eccentric bearing. I'll be calling them on Monday...gotta love waiting 2 weeks for them to actually get you the part just to find out you need something else. *sigh*
A new idler shaft with new bearings and no spacer does not make sense.
But then an eccentric too small does not either.

Re: Mark V Control Sheave Replacement Issue
Posted: Sat Dec 19, 2015 8:44 pm
by Teggy
JPG wrote:Teggy wrote:wa2crk wrote:Did they include the spacer that is supposed to keep the new style bearings separated?
Bill V
No spacer included. Just the new eccentric bearing. I'll be calling them on Monday...gotta love waiting 2 weeks for them to actually get you the part just to find out you need something else. *sigh*
A new idler shaft with new bearings and no spacer does not make sense.
But then an eccentric too small does not either.

I agree JPG! I'll be calling to try and get this all straight (again) on Monday morning.
Re: Mark V Control Sheave Replacement Issue
Posted: Sat Dec 19, 2015 8:46 pm
by JPG
The 'spacer' is between the two bearings and is 'inside' the eccentric.
Re: Mark V Control Sheave Replacement Issue
Posted: Sat Dec 19, 2015 10:54 pm
by Teggy
JPG wrote:The 'spacer' is between the two bearings and is 'inside' the eccentric.
Yes, I have one in my old assembly. The problem is that they've changed the design. The new ones don't have the spacer because all the spacer did before was allow the set screw in the eccentric to grab on to something. With the new design, there is no set screw in the eccentric so there is no need for that spacer which you're talking about. Since the new design has smaller bearings and a smaller eccentric, I almost need a spacer that would go on the outside of the eccentric.
See this link:
http://www.shopsmith.com/ownersite/cata ... r_note.htm
Re: Mark V Control Sheave Replacement Issue
Posted: Sun Dec 20, 2015 12:39 am
by JPG
The 'old' design was a water pump bearing. That outer cylinder was the outside of the bearing, not a spacer. The setscrew prevented it from rotating in the eccentric.
With the new design, the two bearings outer races also needed to be prevented from rotating. The set screw would no longer work, so the split eccentric that is squeezed when the casting is tightened was created.
I am wondering if your headstock had been modified by creating a larger bore.
What is the od of the eccentric and the id of the casting bore?
Re: Mark V Control Sheave Replacement Issue
Posted: Sun Dec 20, 2015 12:43 am
by JPG
Are you sure that is a Shopsmith headstock?
Re: Mark V Control Sheave Replacement Issue
Posted: Sun Dec 20, 2015 2:40 am
by rpd
JPG wrote:Are you sure that is a Shopsmith headstock?
I think you may be on to something there.
Teggy's casting

- eccentric_bearing.jpeg (177.15 KiB) Viewed 2327 times
is "similar but different some how" to the picture ot the one you posted in
Headstock Reassembly Idler Shaft

Re: Mark V Control Sheave Replacement Issue
Posted: Sun Dec 20, 2015 9:51 am
by wa2crk
Can we see a picture of the entire headstock casting? Preferably from a few different angles.
Bill V
I doubt that SS would make a part that differs by that much accidentally. The new eccentric shaft is used as a replacement during the DIY Power Pro upgrade so it should fit all SS headstock castings regardless of vintage.
Bill
Re: Mark V Control Sheave Replacement Issue
Posted: Sun Dec 20, 2015 9:52 am
by Teggy
rpd wrote:JPG wrote:Are you sure that is a Shopsmith headstock?
I think you may be on to something there.
Teggy's casting
eccentric_bearing.jpeg
is "similar but different some how" to the picture ot the one you posted in
Headstock Reassembly Idler Shaft

Well I inherited this machine and the person I inherited it from has passed so I definitely can't say "for sure." It does have all of the Shopsmith Markings (Name Plate and control arm cover) but I suppose that would be pretty easy to spoof.
You guys may be on to something.
https://drive.google.com/file/d/0B1zICx ... sp=sharing
Re: Mark V Control Sheave Replacement Issue
Posted: Sun Dec 20, 2015 10:13 am
by wa2crk
I will say a clone. Early Shopsmiths were made in the USA. I have never seen that logo plate on a Shopsmith.
Bill V