On 14 January 2018 at 00:27, <tom-...@bgp.nu> wrote:

> But, as can be seen in the image below, the various retraction paths (in
> blue) are not along a single driveline.  Why is that?


I believe that this is to that every pass is the same shape, so ensure that
everything is the same.
I am not sure that this makes any sense, given that the motion stops and
waits for the index.
(In fact I am not 100% certain that it does always stop, I think I might
have seen it start a path before stopping, and making a slightly
out-of-position cut when the index happens at just the right point)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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