[Swansea Hackspace] Bits for 3D printing

[Tim Moore]

Many many thanks Justin, just what I needed !

:  )))

Tim_1

On 4 August 2015 at 12:23, Justin Mitchell <justin at swansea.hackspace.org.uk>
wrote:

> On Mon, 2015-08-03 at 19:23 +0100, Tim Moore wrote:
> > Silly question using 3D technology:-
> >
> >
> > I've got a Stepper motor which chuggs round in 1.8 degree steps and I
> > need it to go through 180 degrees in approx 40 seconds....
> >
> >
> > but the rub is its needs to be smooth, and it does an instant step.
>
> If you are using a step-stick driver as some suggested then the minimum
> move will be 1/16th of a step. i.e. 0.112 degrees
>
> if you built your own stepper driver / h-bridge then you very likely
> only get whole steps.
>
> the only way then to make the step size smaller is gearing.
>
> Getting there in a certain time is entirely down to the rate at which
> you trigger the steps, you need to figure out what that is for the speed
> you want to achieve. depending on the speed and inertia of the load you
> may also need to accelerate and decelerate your step rate at the ends of
> travel to prevent overloading the motor and skipping/slipping of the
> drive.
>
> these are all tricks that the 3d printer driver software uses, and you
> can find various arduino libraries around to help you.
>
>
>
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