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Posted: Thu Dec 16, 2010 7:08 pm
by JPG
The 'pix' is a crude indicator of what dimensions I think I need.

[ATTACH]11218[/ATTACH]

A = Pivot to lower gas tube attachment point _____ ", just inside bench tube?.

B = Gas tube attachment point separation Lowered = __________ > 18"
--------------------------------------------------Raised = ____27"______ < 36"

C = Pivot to lower gas tube attachment point Approx 9 1/2"

D = Pivot to arm attachment point of gas tube Lowered = ___________
------------------------------------------------------Raised = ___________

E = Pivot to arm mounting bracket on way tube = __________

F = Arm mounting bracket to gas tube attachment point on arm = _________


The Mark 5 way tubes are 'exposed' for 48 1/2" and the pivot is approx 1 1/2" further out. I will be assuming the Mark 7 pivots are approx 51 1/2" apart.

Posted: Fri Dec 17, 2010 10:42 am
by JPG
Game Called!
https://forum.shopsmith.com/viewtopic.php?p=80316&postcount=40

Speculation was redundant!(and incorrect!)

Posted: Fri Dec 17, 2010 12:20 pm
by easterngray
This makes perfect sense as the difficulty of raising the headstock while positioned for under table operations is probably slight.