All machine move offs should be in the negative direction. I.e. I believe
you have your scales backwards. There was an illustration pinned in the
forum about this

On Jun 25, 2017 9:28 AM, "dave" <dengv...@charter.net> wrote:

>
>
> On 06/25/2017 02:55 AM, andy pugh wrote:
>
>> On 25 June 2017 at 00:20, dave <dengv...@charter.net> wrote:
>>
>> can't quite figure out how I can be in the middle of the bed .... with a
>>> small part and still
>>> get limit violations
>>>
>>> Is this actual limit-switch trips. or warnings that the G-code exceeds
>> machine limits?
>>
>> The first is probably electrical noise. I seem to always end up with a
>> software low-pass on those signals, just because false-trips are so
>> annoying and a couple of mS delay in responding to a limit switch isn't
>> that critical.
>>
>> If it is the second, then you might need to have a look at your coordinate
>> system offsets.
>> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?CoordinateSystems#S
>> o_if_you_re_lost_what_should_you_do
>>
>>
>> .....warning:  gcode exceeds machine limits. I classically set my limits
> at -.2 ..18, -.2, ..9 and 0 ... -3.
> Moving to -9 ... 9, -4 ... 4  for x and y and it still gave me the same
> error message. .... and yes I shutdown linuxcnc and restarted homing on the
> center of the bed.
>
> I suspect that this is a thermal problem ... small fan blowing across the
> mb. Next step is to rig a
>  so-called 'whisper' fan off an 11/40. Can you believe they have a 100,000
> hrs on them.
> Temp is 55 this morn so I'm blowing cool air into the shop. :-)
>
> One issue at a time...
>
> Tnx
>
> Dave
>
>
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