Mark VII with Mark V speed control

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12 years 3 weeks ago #4524 by Bob Fulwider
Bob Fulwider created the topic: Mark VII with Mark V speed control
Just received this modified headstock for repair and was surprised to find it had a speed control for a MV instead of the control cam. I was aware that someone had done this years ago, but had never seen one until now.
Unfortunately, they had replaced all wrong sized bearings in the headstock and have had a time getting them out without cracking any of the fittings.
Have not put it back together to check how all the belts and parts will line up and work.
With metal cams available, this modification looks like an expensive change for the benefit of using a current part.

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12 years 3 weeks ago #4529 by Ron Roberts
Ron Roberts replied the topic: Re: Mark VII with Mark V speed control
Bob,

Is their a diagram or photo of the innards of the Mark VII headstock online anywhere? I'd like to see it if I could find it.

Thanks.

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12 years 3 weeks ago #4531 by DPF
DPF replied the topic: Re: Mark VII with Mark V speed control
Ron,
This thread may shed enough light to see how the speed control works in a MarkVII. Or I can scan the exploded view from the Parts Manual.

Other than the differnt Speed control setup, it's preetty much the same as a MarkV. Same Quill and drive sleeve (Poly-V), sc sheave assembly (only there's the foolower out the end as seen in thread referenced above instead of the clip), just a reversible motor.

Only other major difference is the crank for headstock movement. There's a rack/pinion setup for moving the headstock on the ways.

I can take a bunch of pics when I reassemble mine this week finally.
-DPF

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12 years 3 weeks ago #4533 by Ron Roberts
Ron Roberts replied the topic: Re: Mark VII with Mark V speed control
The pix would be great if you have the time and inclination. Thanks, DPF.

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