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I think in a lot of people's workflows the front of part and WCS are the same location. In my work flow, the WCS is a consistent location and the front of the part floats based on a bunch of factors. It would be nice if the option existed to allow the home position to exist relative to the front of the part, so I didn't have to constantly manually correct the location.
If we make a drop-down for this we could also make it from front of stock. Because if you have a pieces where a lot has to be machined, that would come in handy too.
I run my WCS at the face of my collet: it never changes.
I moved the part out from the face of the collet in the cam and in the actual machine, but did not go into job setup to increase the home position offset.
If the home position was parametric to the part face, it would have updated with the changes and moved with the part.
Granted: most of the time I am not dealing with super tight tolerance parts.
However, if I need to slightly adjust the length of the part, I can offset my subspindle postion (B axis on my doosan) by a couple thou such that it grabs slightly shorter or longer.
Maybe not the best workflow for everyone, but it seems to work out well for me.
I believe we're both primarily using dead length collets, yes, but I've done the same with 3jaw, and on single spindle lathes where 2nd op gets pie jaws..
sub works the same, it's all down to accurately finding the distance between the two; ive not ran a ton of parts across the NTX, two dozen part numbers or so.. but I've only ever set work coordinates once 🙂
If you are working with 3 jaws, you have so many different length of jaws from the front face of the chuck that it really is more work getting a probe, note that value down and then walk to your pc and change that length, than to just program from the front.
As a mill guy, I hate the usual we program from the front of part turning guy mentality but I understand it's much easier when working with a 3 jaw, and at least 8 types of hard jaws and different length pins for in those jaws, let alone the soft jaws you have/need. And it matters how much stock you have and if you are only working from bar or not.
I'm not saying what you guys are doing is wrong let me be clear about that. But for the rest reading this what @Rob.Lockwood does isn't necessarily common practice, not even when he is been doing it all his life.
A previous production job I had set the WCS 2" from the front of the chuck face for all five machines in the cell. This means that to touch off a new tool meant the arm didn't have to be retrieved from its box and attached to add one tool if one got destroyed by accident (broken roughing insert followed by finish tool perhaps). These were Nakamura-Tome Super NTM3's and STW-40's and that company had its first billion dollar revenue year when I started, so I find it hard to believe setting tools from chuck face is all that rare. It's foolproof if the CAM is too, and I found it very easy to work with.
That said, I am still waiting for a home position override so long tools don't self-destruct when the programmer wants a closer home position. For us we have to set Home to 11" from part face. I don't want to have to modify the post for this, it should be stupid simple to implement. Hell, put it in the tool definition to add to Home if desired.
@Laurens-3DTechDraw - eh, even then, i'd rather have a CAD document with the various chuck configurations, with a stable WCS, and vary the part position in CAD\CAM.. but sure, I rarely argue that my solutions are universally better.. they're just USUALLY better 🙂
It, of course, can work if programming from CAM. By hand you would really need to be a clever guy a lot of the times(Just as that you can't really easily check your program). General workflow in 90+% of shops is still based on how people worked 20 years ago. That's more what I meant. That even how clever your solution is, and it fits well with CAM systems I don't see many shops do it that way.
Not sure how a WCS that is flying in mid air can help in setting a new tool offset though.
Considering that we just made a lot of changes to how confinement works and also the parametric chuck settings, that making the home position parametric makes sense as well.
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