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.

John Guenther

> -----Original Message-----
> From: Dan Statman [mailto:dan.statman@...]
> Sent: Wednesday, August 21, 2002 14:46 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] RE: Cam track help!
>
>
> John,
>
> I do not know where on the cycle your spreadsheet starts. All I can tell
> you is that the formula for a 2 period sine wave with a specific amplitude
> is not open for interpretation, so that part of the equation must be
> identical between my method and the method in your resource.
>
> Since I have no idea where your resource has set his origin, then we will
> forever be comparing apples to oranges. Since the numbers you
> have provided
> are not referenced to a formula, it will not be possible for me
> to reconcile
> the differences. I however, have 100% confidence in my calculated values.
>
> I do not have time today to figure out the formula for your numbers, but I
> may have time in the next several. Hope this helps somewhat.
>
> 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 2:26 PM
> Subject: RE: [CAD_CAM_EDM_DRO] RE: Cam track help!
>
>
> > The full wave height is 0.680 which is the stroke of the
> Cam-Axial engine.
> > I changed the amplitude value to 0.34 which gave me a first value of
> > 0.005933818 verses 0.000207119 calculated by Brayton Paul in
> the original
> > design. The other thing I just noticed is that the entire
> table provided
> in
> > the original design is positive numbers meaning the entire sine wave
> ranges
> > between 0.0 and +0.680. I suppose it really doesn't matter as
> long as the
> > sine waves are pretty close in shape so that the piston will travel
> > correctly.
> >
> > This does make for a interesting engine, this brings a whole new
> definition
> > to the term two stroke. This thing will produce two power pulses per
> > revolution of the crank shaft since the sine wave has two peaks and two
> > valley's per 360 degrees of rotation.
> >
> > John
> >
>
>
>
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