Arc.vi 's input "Radius" is distance from arc centre or distance from vector space centre 0,0
Hi everybody,
I am using PXI 7352 +UMI+2 servo Drives+motors which move a table in linear direction X and rotate it along Z axis C.
How can I use Load Circular Arcvi if my one axis is linear and other is rotary e.g. XC table.
Thanks
Surender Kumar
Reckers Automation
Delhi
Surender,
You can run contours with an (almost) infinite number of position
points. The trick is to load new data into the buffer when it has
depleted to a certain amount of points. There is an example in LabVIEW
(Buffered Contouring (Rose).vi) that shows this method. Maybe there was
a bit confusion when you talke with NI India in terms of wording. There
are also onboard variables (about 100) but these are not used for
contouring. Contouring data is stored in an onboard buffer.
In contouring mode the board interpolates through the position points
stored in the buffer with a rate of 10 ms (minimum). Inbetween these
poionts the board interpolates using a cubic spline algorithm. In terms
of accuracy this method is equal to the arc move as arc moves use a
similar internal mechanism as contouring.
With contouring of course you could take care of the tool radius
compensation in your calculations but there is no ready to use solution
for that in LabVIEW. Maybe a 3rd party solution is available for that
(please refer to this thread which you should know
already).
Jochen
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