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Doug White

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In article , (DT) wrote:
In article ,
says...

A friend of mine has a Clausing 8520 mill with a Servo brand power feed
on the table (probably a model 140, or similar). He's put it to good use
for many years as a free-lance custom machinist working out of his home.
Lately the clutch mechanism that disengages the power feed has been
sticking. Ordinarily, when you move the power feed control lever to
center, the gears are supposed to disengage so you can use the handwheel.
I think there is a spring loaded mechanism that pops the drive pinion
down away from the big bevel gear.

The pinion stays engaged all the time, it has a two part shaft with simple
coupling halves that mate with each other. The lower shaft/coupling gets cammed

up directly by the lever and returned by a hefty spring.

Servo has all the manuals online, so there are good diagrams available. I have
had my import version apart, and the illustrations are identical to the Servo
so hopefully they come apart the same. Just unscrew the bolts on the bottom and

the entire lower mechanism will drop down, the final drive unit and upper
housing can stay on the machine.

They are easy to remove from the mill anyway, unscrew the hand crank, slide off

the bevel gear and undo two bolts in the drive unit under where the gear was.
Take care to keep the various shims in the correct places if any are installed.

Thanks! I've passed this along to my friend, and as soon as he gets a
lull, he's going to take his apart & see what is going on. I looked
at the exploded diagram, and it looks like a very nice design. I figured
the pilot light & fast feed switch might be wired up to the upper
housing, but they use a light pipe & push rod to work with the wired bits
attached to the bottom assembly.

Doug White