Could you describe the wiring of these switches on your machine?
I am wondering if you have two wires per switch going up to the logic
board, or only one, with ground sharing.
On 2020-07-21 19:39, Mason Millner wrote:
We are using momentary hinge limit switches
(https://www.amazon.com/URBESTAC-Momentary-Hinge-Roller-Switches/dp/B00MFRMFS6/ref=sr_1_3?ie=UTF8&qid=1535482225&sr=8-3&keywords=limit+switch)
and our spindle
(https://www.amazon.com/Koolertron-Spindle-Milling-Converter-Engraving/dp/B074XTKJTJ/ref=sr_1_9?ie=UTF8&qid=1535482152&sr=8-9&keywords=spindle+cnc)
is operating from its own power supply.
The machine is fairly rigid. No limit switches are triggered from
until material is being cut. The bamboo does vibrate quite a bit as it
spans 65" supported only on the ends, but we have been able to
successfully cut this dimension previously (on a 3-axis Techno machine).
On Tuesday, July 21, 2020 at 1:12:01 PM UTC-4 [email protected] wrote:
You didnt mention what type of limit switches you're using or how
your spindle works. The Y axis itself shouldn't be under any
special stress while cutting but the spindle generally takes a
hard hit as soon as a tool enters the cut. Is the spindle motor
powered by the same power supply your switches are on? Supply
could be dropping low. Is the machine not ridgid and vibration
tripping the switches?
On Tue, Jul 21, 2020, 8:54 AM Mason Millner <[email protected]> wrote:
Hi All,
We are developing a 4-axis CNC to mill bamboo poles and are
currently running tests in just three axis (x, y, z). We can
dry-run g-code files successfully, however we receive limit
switch errors (primarily on joint 1) when we begin cutting
material. We suspect that the error is occuring in the y-axis
and that possibly our drivers are causing a problem (either
they are too small or not tuned adequately).. It is difficult
to tell what is going on and how the machine is configured
from the information given.
We have the z-axis running on the long x-axis, running on two
shorter dual y-axes.
The axis shaft is a ½” (12.7mm) , also the motor shaft is ¼”
(6.35mm). we are using polyurethane insert couplers (these
have regularly been coming loose though).
The motors are NEMA 23s with 3A rating/phase controlled by
Pololu TB67S249FTG drivers on a Cramps 2.2 cape on the
Beaglebone Black. The drivers have a current limit of 1.6A and
are further limited to %90 for safety. The Current limit for
the board and drivers are defiantly a bottle neck, but the
motors have enough power to operate. [Could this be the problem?]
Any help or recommendations would be greatly appreciated. If
more information is needed please let me know. I'm fairly new
to the machine development side of this project. Thanks.
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