[Lab] how to change endmills and not loose Z zero?

[Tom Burns]

Ah, makes sense.

Instead of doing the switch at 0 then, maybe:

move to another known point that is clear,
calculate the software z position for a known physical height (like just
touching the base)
adjust Z so you can change end mills
reposition Z physically to the known physical height, the difference in Z
position is the offset?

Tom

On Wed, Apr 13, 2011 at 3:39 PM, Darcy Whyte <darcy at siteware.com> wrote:

> Returning to zero will bring the spindle too low to withdraw the endmill
> from the chuck.
>
> But even if I could, the length of the endmill sticking out the chuck will
> not be the same. I need to get it to be the same or move it to zero somehow
> and then rezero the z axis in the software.
>
>
>
>
>
>
>
>
> On Wed, Apr 13, 2011 at 3:33 PM, Tom Burns <tom.i.burns at gmail.com> wrote:
>
>> Having no practical experience with a CNC yet this is only a guess, but
>> could you return to zero before switching endmills?  Or would you end up
>> still having to estimate Z position.
>>
>> On Wed, Apr 13, 2011 at 3:30 PM, Darcy Whyte <darcy at siteware.com> wrote:
>>
>>> I want to eventually do cnc cutting with multiple endmills.
>>>
>>> Problem is I wont know where zero is for the work in progress. It's easy
>>> to estimate zero at the start and it works okay for cutting. But to continue
>>> work, an estimate wont do. It has to match.
>>>
>>> Any ideas?
>>>
>>>
>>> --
>>> Darcy Whyte
>>> *Darcy at Siteware.com*
>>> Ottawa, Canada | 613-563-3634 | N 45° 25'03.1" W 75° 42'21.4"
>>> Please attach previous emails when responding (or reply instead of
>>> starting a new thread/subject).
>>>
>>> Inspirational Flying Machines:
>>> http://www.rubber-power.com: Squirrel
>>> http://www.endlessLift.com: Simple Aviation
>>>
>>> Art
>>> www.Mambohead.com <http://www.mambohead.com/>
>>> <http://www.Squirrelify.com>
>>> Software Services (Since '88)
>>> www.Siteware.com: Web, Database, LAMP
>>> www.generalSocial.com: Social Network Theory
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Lab mailing list
>>> Lab at artengine.ca
>>> http://artengine.ca/mailman/listinfo/lab
>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://artengine.ca/pipermail/lab/attachments/20110413/15541e78/attachment.htm>