RE: [CAD_CAM_EDM_DRO] Re: Help a confused newbie out please

Hi, Jim:

The E-Stop is intended to be used by an operator to stop the machine when
the operator sees something wrong. It could be that the carriage has bumped
into a hard limit, or it could be that the oprator has caught his/her hand
in the machine. The actions due to the E-Stop should stop all motion and put
the machine in a 'safe' condition.

The limit switch is there only to detect that the carriage (or something)
has reached the end of travel. It will typically stop the motors.

Either system can maintain position information, depending on how the
control is designed.

-- Jerry


|I thought that a limit stop was the same function as an Estop
|condition for the controller program. I didnt know that they were
|2 seperate things.Told ya I was a newbie!
|So an Estop will cause you to lose position sync,and it stops
|movement abruptly?
|Does a limit stop cause a position sync loss also?How does it stop
|the travel.....abrubptly also?(Im using steppers until I learn
|more, then Ill advance to servos)

Place them near the end of physical travel, but allow some travel for the
motors to slow and stop, as there may not be a brake in the system.

|I had planned on using microswitches with rollers on them, that
|would act as a limit stop as the table/saddle swept them. I just
|didnt know where to place them(ie, before the actual travel limit
|or at the end of travel)