Re: servo brake problem

Thanks Doug! Keith

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Doug Chartier <doug@c...>
wrote:

> At 08:03 AM 8/28/2004, you wrote:
> >The spindle solenoid and brake were already wired and working

before

> >the retrofit process began since it was a Boss 6 CNC Bridgeport

and

> >all the switches etc are already there. Problem is that I can't
> >figure out where the proper wire is that gives power to the

solenoid

> >for brake.
>
>
> When I installed the Centroid on my BOSS 9, I kept the air

solenoids from

> the original system. I did all the "grunt" work of the retro, but

the

> Centroid factory rep plugged in all the wires. My system has 3

solenoids,

> one of which operates the brake.
>
> Just checked the system. This might be helpful.
>
> The air ram up by the spindle engages and disengages the brake.

With the

> system completely shut down this ram can be moved by hand. The

system

> leaves the brake engaged when the system shuts down. Push the ram

up and

> the brake is disengaged. Only needs to move a short distance.

Originally

> I thought the brake might be on a heavy spring so that air

pressure keeps

> the spring compressed and the brake DISengaged. Now appears the

air simply

> moves the ram in one direction or the other where it remains

until air

> pushes it in the opposite direction.
>
> Try moving the ram by hand and check the spindle while it's in

high

> gear. See if moving the ram one way or the other allows the

spindle to be

> turned by hand. Mine does. In low gear it's too hard to turn, so

put it

> in high. Without applying air pressure crank up the spindle motor

and see

> if it works when the brake is disengaged. That might cure the

problem you

> have with the motor. Next see if you can get air to the ram on

top. This

> can probably be done without cranking up the controller. Would

require

> getting the right amount of electricity to the solenoid in some

other

> manner. If you can get the solenoid to work, then it's a matter

of where

> to wire it into the system.
>
> I don't believe it is setup in my system to be somehow connected

to the

> motor or the power going to the motor. Instead it is simply

connected to a

> switch on my controller - the brake switch. The brake switch can

be

> activated automatically if the "Auto" switch for the motor is
> activated. If the motor is in manual on/off mode, the brake

switch also

> has to be operated manually, I think. Don't recall doing it that

way. Do

> know that the brake switch is operable even when the motor switch

is in the

> auto position.
>
> I said before that the system leaves the brake engaged. That is

probably

> only a factor of how I have my switches set when the system is

shut down

> rather than a spring loaded brake or some other sort of feature

that does

> this automatically for some reason.
>
> Hope some of this is helpful.
>
> Doug