On 1/18/21 3:53 PM, Andy Pugh wrote:
On 18 Jan 2021, at 23:08, John Dammeyer<jo...@autoartisans.com> wrote:
So what does LinuxCNC do? Is the thread mucked up if spindle speed is changed
during a feed hold and then start?
I believe that it does. The docs specifically warn against Chang speed during a
threading cycle.
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I seem to recall that lathe threading with G76 will disable the feed
hold signal during the coordinated motion on the drive line, which can
include the straight thread or an optional beginning or end taper within
the stock straight thread length. The electronic gearing between the
spindle encoder and the Z position should keep the thread path accurate
through spindle speed variations. G33 documentation indicates that the
routine calculates the best path to get the tool to the ideal index
keyed path as soon as possible after the index mark signal. This is
mostly from memory, so please refer to the LinuxCNC documentation to get
the official information. I very much suggest _reading_ the
documentation and not skimming because some of the features are not
intuitive.
There are other ways to tread, such as using spindle index only with
dead-reckoning.
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