Mark VII Headstock Reassembly

JPG · Post by **JPG** » Sat Jan 11, 2014 8:48 pm

I added a correction to posts 16,17 of this thread. Picky detail, but I was misleading before.

JPG · Post by **JPG** » Mon Jan 20, 2014 1:49 am

I added corrections/clarifications to posts 13 and 19.

JPG · Post by **JPG** » Tue Sep 30, 2014 5:12 pm

Since I have (at last) got the speed control operating correctly, I am about to resume completing this thread. As a result of things 'discovered' the past few months, I added some corrections to pages 3,6,12,13,18 and a link to the activity endured since January this year a couple of places and here.

https://forum.shopsmith.com/viewtopic.php?p=159029#post159029

It all started when I was simply going to install the motor belt.

:D:D:D:D

Besides the mechanical stuff, I 'misplaced' my camera so no pix over the past couple of months. Now all is good again!!!:rolleyes:

JPG · Post by **JPG** » Sat Oct 11, 2014 2:24 am

Last thing to finish the headstock is to attach the belt cover. A little bit different from slapping it on a M5/V/7.

The headstock positioning clutch release must be positioned against the movable plate. The large 'lubricating' hole is a help by allowing one to see it.

: belt cover release.jpg (595.62 KiB) Viewed 2287 times

Check to make sure it is moving the clutch plate.

: belt cover release 2.jpg (599.92 KiB) Viewed 2287 times

Cover complete. I think a newer(longer) hub would look better on the idler shaft.

: belt cover overall.jpg (459.18 KiB) Viewed 2287 times

Headstock complete!!!!!!!!!!! * Dreary day when taken. Better pix coming when attached to the upper assembly(next).
[ATTACH]26443[/ATTACH]

: Final.jpg (764.06 KiB) Viewed 2286 times

The paint got a bit 'distressed' over the belt 'journey'. I will likely just touch it up(or ignore it).

* Well the true MVII quill still needs to be broken down etc.

JPG · Post by **JPG** » Tue Nov 11, 2014 10:32 pm

Well reassembling the Mark VII quill ended up being a bit of a challenge.

The reason for the 'extra' shims became apparent.

Leaving them out resulted in about 0.040" end play of the shaft. This was caused by the bearing seating too far into the quill. That created a gap between the bearing outer od and the retaining ring.

Herein is the cause and the reason for the unexpected shims.

Apparently a bearing had been slipping and wore the quill by increasing the bore depth.

[ATTACH]26842[/ATTACH]

Another problem was the butchering of the shaft flat.

[ATTACH]26843[/ATTACH]

Some judicious hand grinding restored the flat.

[ATTACH]26844[/ATTACH]

I replaced the quill with another of Mark 5 vintage. All that I have are the same on the output shaft end, but Gilmer quills I believe are longer.

The shaft and bearing are inserted into the quill same as usual(including the top hat spacer). The bearing in the pix was what was on the shaft from E-bay. I replaced it with one that seems to have less 'play'.

[ATTACH]26845[/ATTACH]

Add the outer stop ring, rubber bumper and the knurled knob and it is complete. The coupler is slid onto the splined shaft.

[ATTACH]26846[/ATTACH]

JPG · Post by **JPG** » Tue Nov 11, 2014 10:39 pm

This pix shows the difference between the Mark VII coupler and a current version.

[ATTACH]26847[/ATTACH]

An additional difference between quills today and the Mark VII vintage is the id of the quill. Hence the different outer shape of the coupler. Also affecting this is the shorter quill shaft length. The Mark VII coupler goes further into the quill when it is retracted fully.

jerryricht · Post by **jerryricht** » Mon Apr 10, 2023 12:01 pm

Greetings JPG,
It’s been awhile since I joined the forum and posted re: my “new”…. “free”…. MK VII, and it’s motor issues. Motor fixed.

I am in the process of rebuilding the quill, noticed the shims … thought WTH?
So I looked you up again. I see you had the same experience!
However I am not sure I agree with your conclusions that it’s due to wear.

You had mentioned somewhere that the bearings for the idler shaft and the quill were the same.
So I decided to look at the idler shaft. They are likely the original bearings. KOYO S375Z (Japan). (Ya can’t find them anymore)

I mic’ed them and they were .040 deeper! I know, it’s weird, but ?? Coincidence?

So, my conclusion is that Magna made the quill to fit the bearing.

Replacement bearing likely has no effect on the idler, but is obviously a problem for the quill.

so…Buying some .040 SS bearing shims today. It’s always something. This thing is worse than owing an MG.

Thanks for your MK VII rebuild thread. Now have to do that. Like, I have the time….

I think I know why this thing was “free” . Nothing is free, the curse was just transferred to me..

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