Replacing crank/lock on rev1 MarkVII carriage w/ 510 style

  • DPF
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12 years 10 months ago #4522 by DPF
DPF created the topic: Replacing crank/lock on rev1 MarkVII carriage w/ 510 style
In case anyone is interested, I've done some looking and may likely do this mod after reassembling the MarkVII in the next week or so.

On my VII (one of the earlier revision ones) my table height adjustment is done by a crank/lock setup like the headstock lock/crack. You flip the crank over to lock it. Looks elegant, but unfortunately it was a form over function thing. The problem is, as you flip the crack over to release, the weight of the table makes it start to run and drop so you have to be careful and there's no good place to hold it from turning with your other hand.

Upon reassembly I'm going to see if adjusting the nut on the back side of carriage will help, maybe get it to release a little later and it will be okay. I assume that will be a futile excersize and that this is the reason they switched to a 510/520 style wheel/lock type setup in a later revision on the VII.

So I started looking and there's no reason why I can't get replacement 520 carriage parts (just the square rod, c-clip, wheel assembly and lock lever) and use that. I'll just have to cut a bit off the end where the c-clip goes and add a new clip groove. There's a machine shop here at work and they'll do it for me. The cost of the replacement parts is under $40. It will be a bigger wheel than the MarkVII version as well.

If I find it a necessary mod, I'll post the pics when I do it as well as how well it works.

Just something for those of you with the same carriage version to consider. It's not that expensive an upgrade if you have a way to mod the bar.


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