RE: [CAD_CAM_EDM_DRO] RE: Cam track help!

Dan,

Ok, thanks that helps. Would there be anything gained by recalculating it
at 0.5 degree or smaller increments instead of the 1 degree increments? I
suppose I could do that and run it on the mill just to see how it acts.
When I ran the original gcode I produced it acted a little strange at the
peaks but seemed fine other wise.

john

> -----Original Message-----
> From: Dan Statman [mailto:dan.statman@...]
> Sent: Wednesday, August 21, 2002 16:15
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] RE: Cam track help!
>
>
> Since I cannot leave a mathematical problem alone, I have compared the two
> sets of data. Your data represents a 45 degree phase shift of
> the sine wave
> and a 0.34 inch axial shift (half of the peak to peak wave height). When
> the data are plotted on the same scale and the phase shift and offset are
> taken into account they are IDENTICAL.
>
> The way I determined this was to plot both sets of data and look at the
> differences, it is obvious once that is done.
>
> Daniel J. Statman, Statman Designs
> www.statmandesigns.com
>
>
> ----- Original Message -----
> From: "j.guenther" <j.guenther@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, August 21, 2002 3:15 PM
> Subject: RE: [CAD_CAM_EDM_DRO] RE: Cam track help!
>
>
> > Dan,
> >
> > That's fine with me, take your time. I have no idea where he set the
> origin
> > either, I will try to scan the information I have and email it
> to you off
> > list. I read the article last night and it does not give any
> information
> on
> > how he calculated the sine wave for the track. It might be in
> his patent
> > application, I will search for that tonight if I get a chance.
> I was not
> > questioning the formula, just the difference in results which I assumed
> was
> > a difference in origin points.
> >
> > I am beginning to under stand why Brayton Paul had a shop in
> Ohio cut the
> > tracks for the 10 sets of castings he made. He had no CNC
> capability and
> > had attempted to cut them using a bell crank mechanism driven
> off the lead
> > screw on his lathe with a Sherline lathe head mounted to the cross slide
> to
> > drive a milling cutter. He stated in the article that this did not work
> out
> > so he found a shop to cut them for him. I am convinced that
> the cam track
> > can be cut using CNC and a rotary table to a reasonably high degree of
> > accuracy.
> >
> > I am going to build a mach up of this thing just to see the motion. The
> > piston rotates on a splined shaft while the track converts the linear
> motion
> > of the piston to rotary motion of the crank shaft.
> >
>
>
>
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