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

[Darcy Whyte]

I guess if I had a block of metal and I always place it on the bed when
mounting an endmill. I could just make sure the endmill is touching the
block of metal. Then when I change endmills it will be at the same height.

I think that's what you meant right?


On Wed, Apr 13, 2011 at 3:43 PM, Tom Burns <tom.i.burns at gmail.com> wrote:

> 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*
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>>
>
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