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

[Tom Burns]

yup and from there you could calculate the z offset in software between the
endmills to compensate

Tom

On Wed, Apr 13, 2011 at 3:46 PM, Darcy Whyte <darcy at siteware.com> wrote:

>
> 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*
>>>>> Ottawa, Canada | 613-563-3634 | N 45° 25'03.1" W 75° 42'21.4"
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>>
>
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