On 01/14/2018 11:39 AM, Gene Heskett wrote:
On Sunday 14 January 2018 12:23:51 Tom Easterday wrote:
On Jan 13, 2018, at 6:47 PM, andy pugh <bodge...@gmail.com> wrote:
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)
Why would it be important that the passes have the same shape? What
is important is that the tool goes in and comes out in a known,
controllable location so you don’t hit the backside of your tool or
take the tops off your threads. I don’t know if it always stops but
it better wait for index otherwise it isn’t spindle synchronized!
Your last sentence describes a bug doesn’t it?
-Tom
I think so, but I have yet to observe a damaged thread because of it.
However, I'd also recommend a g64p0.001 in the code just to make me feel
better. The curvature of the knee at l2 retract is affected and that can
be seen with enough magnification. IOW, it is not a show stopper.
Changing the spindle speed in the middle of the g76 run creates far
larger problems.
You do have to allow enough air pass for the Z to come up to
speed while following the spindle synch.
Depending on the accel limits on the Z axis, the spindle
speed and the thread pitch, this allowance for the synch-up
will vary. Coarse threads and high RPM require more allowance.
Jon
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