Re: [CAD_CAM_EDM_DRO] Re: servo brake problem

Keith Clark 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?
>
>

From what everyone is reporting in their replies, it sounds like the
solenoid
is in an AIR valve that admits air to a cylinder in the head. It is the AIR
CYLINDER that actually releases the brake. You can disconnect the air
line at the brake cylinder, and make sure air hisses when the solenoid is
activated. If so, then you may need more air pressure (the BOSS may be
designed to use 125 PSI shop air, which is a standard distribution pressure
in some shops.) It is also possible that the brake plate is rusted to the
brake facing. More air pressure might bust it loose, or you might have to
dismantle the brake to get the parts unstuck.

If air does NOT hiss when you turn on the solenoid with the line unhooked,
then you have a bad solenoid valve. You might be able to dismantle it for
cleaning, depending on the type. These sometimes get deposits of compressor
oil that congeal if left idle for too long. Sometimes you can get them
unstuck
by rapping on the valve while it is activated.

Jon