Re: [CAD_CAM_EDM_DRO] Re: servo brake problem

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@...> 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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