CAD CAM EDM DRO - Yahoo Group Archive

Re: pulse generator

Posted by markotime
on 2010-03-25 05:39:47 UTC
I have a box with lots of switches etc. that includes ramp up
and down controls to generate a programmable sequence of
pulses for stepper motor control - maybe testing. I'd part with
it as-is for 100.00. Needs a bit of work, a couple of the
small toggle switch paddles are missing. /mark

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "caudlet" <thom@...> wrote:
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "toolmkr" <dkmach2@> wrote:
> >
> > Hello,
> > I am setting up a stepper motor to drive a mechanism at variable
> > speeds, 0-60 rpm Spec sheets for the motor and driver can be found on Anaheim Automation web site, the motor model is 34Y214S-LW8 and the driver model is MBC10641. The tech support person at Anaheim Automation advised me that I would need to purchase an external "pulse generator" in order to make the setup work as I would like. I need to be able to change the speed of the stepper motor on-the-fly without having it connected to a computer by simply turning a knob such as on a potentiometer.
> > He told me I would be able to pick up a pulse generator from Radio Shack, however I was at the store and they were not too helpful.
> > Any assistance would be appreciated.
> >
> > Sincerely,
> > Denis
>
> Depending on wheather you need direction as well as variable speed the 555 circut will work. At those speeds (really low RPM) there will be a degree of vibration even with microstepping. We have a conveyor oven for surface mount PCB's with a stepper turning a gear reduction and using a 555 circuit. It vibrates.
>
> You you want a wider range of frequencies with a 50% duty cycle then the CD4046 (74HCT4046) is a VCO (voltage controlled oscillator) that uses a single cap and resistor (pot) to sweep across a wide range. It also allows you to put in an acceleration curve by putting a cap in the voltage input pin. Getting 0 RPM (no pulses) is harder with either circuit because at really low pulse rates the circuit get unstable.
>
> Any direction needs to come from a switch unless you want to add a lot more circuitry.
> >
>

Discussion Thread

toolmkr 2010-03-20 10:12:46 UTC pulse generator Henrik Olsson 2010-03-20 10:39:08 UTC Re: [CAD_CAM_EDM_DRO] pulse generator Roland Jollivet 2010-03-20 12:26:57 UTC Re: [CAD_CAM_EDM_DRO] pulse generator stan 2010-03-22 10:02:43 UTC Re: [CAD_CAM_EDM_DRO] pulse generator Wade Penney 2010-03-23 02:44:53 UTC pulse generator Jamie Cunningham 2010-03-23 02:45:59 UTC Re: [CAD_CAM_EDM_DRO] pulse generator turbulatordude 2010-03-23 02:47:01 UTC Re: pulse generator johann_ohnesorg 2010-03-23 05:49:34 UTC Re: pulse generator David G. LeVine 2010-03-23 09:17:49 UTC Re: [CAD_CAM_EDM_DRO] Re: pulse generator caudlet 2010-03-24 08:28:14 UTC Re: pulse generator Don Butterworth 2010-03-24 10:03:37 UTC RE: [CAD_CAM_EDM_DRO] Re: pulse generator markotime 2010-03-25 05:39:47 UTC Re: pulse generator