Re: servo brake problem

Ron, I was hoping to have the brake work just during tool changes
since there is no other way to hold the spindle while the wrench is
being applied. I do know it is a 24 volt 7 amp solenoid and nothing
happens to any of the 3 solenoids when I put power at their wires
but the speed solenoids work when powered from the terminal strip.
I like the idea of switching the wires from one of the speed
solenoids to get the brake off and tested. I learned from another
kind participant that there is a red button in the end of the
solenoid that can be pressed in to release the air! I'll try these
2 tricks in the morning (its 1:30 am now) after a few hours of
sleep... Still got the axis motor wiring problem in another
question to tackle. I think I will eventually get to the bottom of
all this with a lot of help from my new CAD-CAM-EDM-DRO friends!

Thanks!
Keith Clark

--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

> Keith,
>
> A solenoid is basically an electromagnet that when

energized by applying the required voltage and amperage attracts
a "shoe" or "piston" that results in a mechanical linear motion.
Many automobile starter motors (GM and Chrysler) use them to engage
the bendix with the starter ring on the flywheel. They can be used
in a miriad of applications where a mechanical motion is desired by
applying and electrical current. Such as Electrically controlled
pneumatic valves, relays, etc. When you apply a current to the
solenoid atop the valve it in turn retracts opening a gate allowing
the flow of air.

>
> You need to find out what voltage and amperage it is in

DC and apply that. if it doesnt work, its shot. You mention that the
the air valve for the speed control is still operational, you can
read the volts and amps from it when you energize it. If it is the
same valve and model number, move the wires over to the brake valve
and it should operate also. Again, if it doesnt it's shot.

>
> I dont use a brake on my mill and don't want one. It would be

possible to throw a boring head off the arbor stopping abruptly from
high RPM. Its impossible to dial in with the spindle on radii with
an interapid and the brake locked. I have a link made that locks my
brake when necessary for broaching out corners with a square tool
bit. You can remove a small radius left by an endmill in a corner by
placing a square tool bit in the spindle or holder. First grind one
end of the toolbit round in a whirligig to any nominal dimension
grind a diagonal positive rake on the other end. Place it in a
collet or holder. Position it parallel to both sides and plunge by
quilling the spindle up and down and advance in small increments
until it is gone. Great Bridgeport trick :-)

>
> Ron
>
>
>
> Keith Clark <mail@t...> wrote:
>
> Jon, The solenoid seems to be in a DC circuit and I am applying a

24

> vDC current. How does a DC brake coil work, do they use a solenoid
> or air pressure?
>
> Keith
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson wrote:
> > Lance Hopper wrote:
> >
> > >Hello,
> > > Logically, if power were removed from the solenoid, during an

E-

> > >stop for example, the spindle should be in brake mode. When the
> > >solenoid coil is charged, the spindle should be free. Just my
> guess,
> > >mind you.
> > >
> > >Can you check and see if there is continuity through the coil?

No

> > >electricity can flow through the coil if it's broke.
> > >
> > >
> > It just ocurred to me that it could be a DC brake coil. If you

put

> AC
> > on it,
> > it would likely have way too much inductance, and have no effect.
> >
> > Jon
>
>
>
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