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Started taking the MVII apart today. This thread documents the disassembly of the upper section that includes the way and lower tubes along with the headstock and table carriage. Since the lower tubes are not strictly 'bench' tubes I will refer to them as the 'lower' tubes. The lower tubes have the dual pivots and 'clamps' attached binding them as a pair.

Tis a bit different since the lower tubes always travel with the way tubes. The table tubes in this case maintain the tube spacing rather than raising the way tubes on one end for headstock removal.

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Hmmmmm! Where have I seen way tube retaining screws on top of the end castings before?:rolleyes: There is another set on the bottom of the casting that secures the lower tubes.

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After a bit of selective tapping and pulling, the end castings came off.
In this case any of the four tubes can create a jamming situation, so small increments of motion is needed.

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Next step was pull the headstock off the end of the way tubes. Doing so created a surprise! One of the way tubes pulled out of the other end casting. Reminds me of the common M5/V loose bench tube problem.

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In addition to the set screw at the opposite end being 'loose', a burr on this end contributed to the 'pull out'.

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Continued next post

Solution was to gently remove the burr by filing.

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This pix shows the clamp details. The cam is secured to the clamp shaft by a tension(roll) pin. The spring loaded ball provides a lock for the shaft when the tubes are horizontal.

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The lever is attached to the cam by a pair of screws.

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The tube clamp drops down into this 'socket' and when rotated the tubes are secured to the base. The notch supplies the detent for the spring loaded ball to drop into.

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So here be the upper assembly laid out.

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The round holes in the center of the end castings are for medallions. Both were damaged and were removed for shipping.

This thread is part of a Mark VII refurb thread and is linked to from https://forum.shopsmith.com/viewtopic.php?t=11373