[Lab] Arduino Day and some great advice!

Dave Hunt dave at huntgang.com
Mon Apr 4 10:54:13 EDT 2016

Hey Adrian, I can't "weight" to see it! ;)

I should have some of those stepper drivers some place, (might even in the
Make613 workshop), They are the ones used on a RAMPS (3D printer) Arduino

On Sun, Apr 3, 2016 at 2:17 PM, Adrian <adrian at woodsgood.ca> wrote:

> Dear all,
> Some of you were involved in a discussion about my new clock - TIME WEIGHTS
> - during Arduino Day.
> The new clock - TIME WEIGHTS - displays the time (hours, minutes and
> seconds) using three brass weights. The weights are driven in a looped
> configuration with three servos, three pulleys and GT2 timing belt and a
> couple of pulleys. As the length of the belt changes with the displayed
> time, I needed a means of "spooling" the excess belt, while also playing it
> out on demand.
> As I mentioned yesterday, I have been struggling with the spooling
> system...
> I have tried using a brushless motor but it had insufficient torque. I then
> tried a servo modified for continuous rotation but only succeeded in
> stripping the gears as the torque from the stepper pulling on the servo was
> too great!
> Dave, You're a genius!
> Following your advice, I tried using an old tape measure mechanism to
> rewind
> the timing belt (similar to what I used in the LENGTH OF TIME clock) and
> the
> spooling works beautifully.
> Therein lies the power of community!!
> Video to come!
> Bye the way, does anyone have any A4988 Stepper Driver Modules that they
> could lend me?
> I've been using the DRV8825 Stepper Motor Drivers and they are really
> problematic.
> I have 10 on order but do not expect them for a couple of weeks.
> Many thanks,
> ... Adrian
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