Some of those motors have a plastic shaft and a LED behind it, so you can illuminate the pointer.
Double-shaft motors also doubles the electronics and coding.
Leo..
Found this page.
Interesting. The author comments about fixing the range of motion (but note the weird half gear in the second image, implying that a fix is not possible with that particular version):
The motors used are special instrument cluster (automotive dashboard) motors: they are dual-shaft and have the end stops removed for a 360° rotation.
The original motor is the VID28.05 It is available as BKA30D R5 too.
I only see the end stop for the outer shaft.
I think I would remove the stop from the black casing instead of from the white gear.
So the compression spring would stay in place and not rotate.
Link to another build.
Leo..
List of X40 motors.
There is one stacked (dual shaft) version without end stops.
Leo..
I think it is a full gear but "half obscured" by the metal plate above it.
Good catch! That did seem really odd.
OP seems to have lost interest in the discussion.
What I have learned so far:
X-style (round) motors are said (by a website) to be quieter than the big oval ones.
But the oval ones are cheaper. Stack density with round motors is higher, but not an issue with oval motors.
A couple of motors can be driven directly by an Uno R3 (not R4), Nano or Mega, with a special X-motor 6-sequence library.
More motors can only be controlled with a single processor if special 6-sequence motor driver chips are used. The ASTI6606z is said to work better than the AX1201728SG.
Any stepper software can now be used, since the 6-step sequence is done in hardware.
The FastAcelStepper library looks promissing (up to 14 motors per processor).
Multiple motors require high step rates and floating point calculations for acelleration.
ESP32 processors seems more suitable for high pointer speed than an AVR board.
See the step rates in that library.
The bonus wireless ESP-NOW communication option seems easier than wired serial or I2C links. Expansions can then be as simple as adding another motor cluster.
Leo..
Edit: I have made a test setup of four x27.168 (single axis) motors, which are directly driven by an Uno R3 and are sweeping at full speed. Not a problem,except initially with zeroing.
I assume a Mega could drive more. Direct drive is a good option for a couple of motors.
Hello barbess,
Have you built the project yet? Have you checked out the following address? GitHub - Vallasc/clockclock24-replica: My personal implementation of the "ClockClock 24" by Humans Since 1982..
This is a very well-documented project with a 3 x 8 arrangement for displaying the time (NTP) and other patterns.
And I think it would be possible for a programmer to expand it to, for example, a 6 x 16 display matrix or larger, with additional functions and patterns.
Good luck and best regards from Germany.
P.S. Please post your programme code here. I'm particularly interested in how you work with the hall sensors. Thank you.
P.P.S. I hope for your sake that you don't live in the U.S. of A... It could get expensive if you order the components from the Chinese ;-).
...that should be section ‘AD’ with a diameter of 4.0 mm in the motor drawing in aliexpress.
Section ‘AF’ clearly shows the diameter of the inner metal axle (1.5 mm).
BTW, the motor can rotate 360 degrees without stopping.