I'll jump in here and be slightly off topic. I've recently been setting up
some ATS688s for spindle encoding on a big straight bevel gear. Works
great. Wish the duty cycle was a bit higher so I wouldn't have to skew the
A/B phases off 90 degrees. But the gear teeth aren't square like the
reference 60-0 target from the data sheet, so this was pretty much as
expected.
I also tried to use a ats668 to detect a drill hole on the gear shaft.
Forget it. Unless you're target really looks like a gear tooth an ats668
is not what you want. Ordered some ats601s and 675s to try instead for the
index pulse.
Also keep the ats668 (and most others in the line I assume) mounted fairly
rigidly with short leads. I found when my mill head reversed directions
that some sort of magnetic coupling happens with the gear teeth causing
the sensor to vibrate and moved enough to hit the gear briefly. I spent a
couple hours trying to figure out if the torque from reversal was moving
that gear around, bad bearing, etc, until I figured out it was the sensor
moving. It's not super obvious when you're staring deep into a mill-head
head with a flashlight what's going on.
On Sat, 27 Jan 2018 15:35:54 -0500, John Alexander Stewart
<ivatt...@gmail.com> wrote:
Hi all;
I am restarting an older CNC lathe conversion - an Emco Compact-8, fwiw.
I have the 5i25 and 7i76, and 6 ats-667 sensors for spindle. (6, because
if
I only ordered 3, I'd end up breaking one, and shipping is expensive...)
Any wiring issues I should be aware of? Field voltage is about 8v; well
within the range of the ATS-667. I have some small relays for driving the
VFD for the spindle, also driven off of field power.
The Emco spindle has a 40 tooth gear, and the aluminium pulley has a set
screw, so I should be ok with that - 40 teeth should be more than enough,
right?
Thanks for any advice/war stories you are willing to give.
John.
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