Shopsmith Forums

Thanks Dwayne

Here is an update on progress…
3D hard surface models created in Blender software.

Item 13, 501324 Assembly - Idler Shaft (nut, washer, shaft, 2x bearings, 2x spacers, eccentric, set screw, 2x E-Clips)

Item 14, 501320 Key

Item 15, 501207 Sheave - Idler Shaft

Item 17, 501325 Sheave - Control ...

Measured against both sides of the control sheave.

(180-144) / 2 =18 degrees

I’ll have to remove the bearing before measuring the shaft, sleeve, and bearing seat depth.

I tried setting the protractor to 142 to see if the angle could be 19 degrees, but it wasn’t even a close fit.

Wow... very nice drawing. Did you do this yourself ?

I did not think to measure from the shaft tube.

I'll remeasure it... see what I come up with.

I'm also thinking that the Mark VII sheve's originally used a custom v-belt in the early 60's. I'll also check the original belt dimensions (507490)

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After messing around with just one sheave, it was time to do some "highly :rolleyes: scientific" measurements using a camera, 90 degree square, and both sheave halves on a shaft.

There were several pictures taken (only 3 of them were used) and imported them into Photoshop (for cleaning) and then ...

Does anyone have information on the pitch of the sheave … or even the motor drive vee belt (507490)?

I’ve measured the worn sheave at 18 degrees (180-162). I’m guessing that the outer portion of the metal is least worn so I biased the measurement there.

I’m also guessing that the vee belt pitch ...

These next "CAM Follower" pictures are from 2010 for comparison.

The bearing (attached to the CAM Follower Stud/Post) in this picture seems to have a larger air gap than the previous one.
I believe it is the original OEM installation, however there are no measurements available.

I'll have to do ...

I pulled this Sheave Control Assembly out of a trashed Mark VII headstock that someone must have dropped. The housing was broken and braised at the eccentric area.

The bearing is shot, so before removing it… does anyone have some words of wisdom?

I measured 0.030 in max air gap between the cam ...

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Here is the STL file used to fabricate the blue "CAM Control" PN 501337 pictured in this thread.
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(although the icon shows it as a pdf attachment... it's not a pdf.)

There is a free 3D viewer online at https://3dviewer.net/
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How do I upload the STL file ?

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