Don't forget that whatever type of home switch you use,
it must be able to distinguish one (ball?)screw turn
from the next, and be reliable and repeatable, lest
disaster occur.
For those with homebuilt machines using fine-pitch
"All-Thread" screws instead of ballscrews or acme screws,
this can be quite challenging.
BTW, as a defense against disaster, a wise machine owner
can install "witness lines" (if they are not already
installed) to inspect whether the homing operation has
been accomplished successfully. Like this:
(Lines separated horizontally by 1/2 screw pitch:)
| |
| | | | | |
================ ======================
| |
| |
Good Bad
One (or both) plates should be movable 1 screw turn.
You do still have to *look* at them, though. ;)
Kim
On 06/13/2011 03:47 PM, Peter Loron wrote:
> Hello, folks.
> Can anybody comment on using hall effect switches on a
> 3 axis mill for limit / home switches? Seems like they
> would have some possible advantages over physical contact
> switches.
>
> Thanks.
>
> -Pete
>
>
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