Re: [CAD_CAM_EDM_DRO] Re: The mechanical part of my router is done!

On Fri, 18 Jul 2003 18:04:55 -0400, you wrote:

>Chuck,
>What you did is right and having the 555 is a benefit for testing purposes.
>Add a switch to cut in as needed.
>Why the L297-298 may not perform:
>Test for a 3.5 micro-sec neg going pulse at pin 1 (L297) at ~18 KHz.
>If not there, the oscillator is not working. See R21 and C5 for the timing components.

If the oscillator is not working, then it is likely that the chopper
fails full on. This will result in blowing the fuse since the current
will be limited principally by the motor windings. Had one with a
minor problem in development that did that.

Harvey