My Mazak V5 had a coarse helix cam which oriented the spindle. The one
at Galesburg used something closer to an inductive sensor to sense
index.. I think that got swapped out for an encoder. Once it picked up
the index it then rotated n counts to index the spindle for tool
change. If memory serves the spindle did a dampened oscillation to get
to position.
Dave
On 3/18/21 8:10 PM, John Dammeyer wrote:
-----Original Message-----
From: Jon Elson [mailto:el...@pico-systems.com]
Interesting topic.
I take it then that you can't actually move the spindle to the index position
unless you have some sort of control beyond velocity?
I'm currently using PWM on mine but once I redo some wiring I can run it with
step/dir. So theoretically it should be possible to
move to a 'home' or '0.000' position. But how is that even done if the spindle
is controlled with M3,M4 and Sxxx?
You have to put some kind of custom component in between.
The problem is you now want to
have a thing which switches back and forth between a spindle
(M3, 4 and 5 and Sxxx) and an axis C. You have to give some
kind of command with a custom M code that disconnects it as
an axis and connects it as a spindle, and then reverses the
process, all without causing a following error.
It could be a bit tricky. This has come up a number of
times in the past.
Jon
Not having one of those keyed tool changers or for that matter a HAAS to play
with I'm partly in the dark here. If your mill has one of those BT-30 to BT-50
type holders with the two slots on the side do they not need to lock into the
spindle?
Done by hand I guess a human just rotates it until it slips the rest of the way
in.
Is the machine told turn 1 RPM while the tool changer presses the tool up so it
latches into the slot? Or do the fancy machines have an index to which they
locate so the tool automatically latches in with the correct orientation?
Thanks
John
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