Have to say never. I measure co-extruded Fuel Tanks and have to put their +Z to the CMM -Y otherwise I'd never get around them to measure all the features.
I try to get the workpiece as square to the machine as I can. I keep a fixture on the machine at all times that I indicate square before clamping. Everything else comes off of that. My jog box is the older model that doesn't have the options of moving square to the part or alignment.
sigpic Life is not a journey to the grave with the intention of arriving safely, but rather a skid in broadside, totally worn, proclaiming WOW What a ride!
I would say something like 95% of the time. If no effort is made to square the part to machine axis it is because it is a round part standing on end with no rotational features. Not many of those, but a few.
sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery
i use the 1/4-20 tapped holes in the rayco plate to get it close then let the computerized alignment take over. as far as indicating it in the "old fashioned way" w/in .0001. never. those days are long gone.
I also use a RAYCO plate the majority of the time. I generally square it up to the threaded inserts in my plate, it's close enough to square so that my 90° probes are square to my workpiece.
James Temmen
There is no job so simple that it can't be done wrong.
Probably 50-50. Like posted previously if there are tip angle changes...a must, we dont have rayco plate or similiar...Run the probe in the axis' to get it as close as I can.
[QUOTE=Paul Sarrach]How often do you square up your Fixture/Part true to the Machine axis?
I use a Rayco system, and have a 90° corner bolted to the plate. I use it as much as possible to give myself the maximum shank clearance in features of depth. I still do mathematical alignments with measured features.
Has anybody made an L-Probe fixture? Right now our current method of building a new L probe is doing it by eye, and praying that it calibrates. I feel...
So Im working on a fuel cap door, in a fixture, and im having repeatability issues. Im using an sm25 scanning head with a probe change to the TP20 midprogram....
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