Re: [CAD_CAM_EDM_DRO] Low cost limit switch suggestions

if you have any extra travel outside the original limit switches (~1/8")
you could add cheaper less accurate 'overtravel' switches to kill the
power to the drives 'just in case'

the computer will read the home and limit switches as usual
without shutting down the drives so you can recover without losing
position but if something goes horribly wrong you wont drop the
table on the floor

Brian

On Tuesday 04 September 2001 07:08, you wrote:
> Hi,
> I'm putting servos w/gekko 320s on the x and y axes of a
> older ball screw equipped mill and am going to use CNC PRO.
>
> In talking to Mariss of gekkodrives he recommended that the
> limits kill the power to the drives because if a drive fails
> there is a good chance that the output transistors will
> short and the motor will travel at top speed until it blows
> the fuse or hits the end of the ballscrew (not good).
>
> This means I used up the original limits that are on the
> machine.
>
> So here are the questions, does any one have a suggestion
> for limit switches that are inexpensive, rugged, accurate,
> and relatively small (I want it all). Also it would be nice
> if I could only have to install one per axis which brings up
> the second question,
>
> If I already have max. travel limits do I need any thing but
> a home switch?
>
> What are the reasons for having limits the computer can see?
>
> Bob KB1FRW
>
>
>
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