Ah, makes sense.<div><br></div><div>Instead of doing the switch at 0 then, maybe:</div><div><br></div><div>move to another known point that is clear, </div><div>calculate the software z position for a known physical height (like just touching the base)</div>
<div>adjust Z so you can change end mills</div><div>reposition Z physically to the known physical height, the difference in Z position is the offset?</div><div><br></div><div>Tom<br><br><div class="gmail_quote">On Wed, Apr 13, 2011 at 3:39 PM, Darcy Whyte <span dir="ltr"><<a href="mailto:darcy@siteware.com">darcy@siteware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div>Returning to zero will bring the spindle too low to withdraw the endmill from the chuck.</div><div><br></div>
<div>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.</div>
<div><br></div><div><br></div><div><br></div><div><br></div><div><br></div></div><div><div></div><div class="h5"><br>
<br><br><div class="gmail_quote">On Wed, Apr 13, 2011 at 3:33 PM, Tom Burns <span dir="ltr"><<a href="mailto:tom.i.burns@gmail.com" target="_blank">tom.i.burns@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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.<br><br><div class="gmail_quote"><div><div>
</div><div>On Wed, Apr 13, 2011 at 3:30 PM, Darcy Whyte <span dir="ltr"><<a href="mailto:darcy@siteware.com" target="_blank">darcy@siteware.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div>I want to eventually do cnc cutting with multiple endmills. <div><br></div>
<div>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. </div>
<div><br></div><div>Any ideas?</div><div><br clear="all"><br>--<br>Darcy Whyte<br><b>Darcy@Siteware.com</b><div>Ottawa, Canada | <a href="tel:613-563-3634" value="+16135633634" target="_blank">613-563-3634</a> | N 45° 25'03.1" W 75° 42'21.4"</div>
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