Re: Re: Cam making....

>
> Neville.
> I also do cams for old vintage racing bikes and what i do is place the pattern
> cam on a stepper driven dividing head and move round in 5 degree increments and
> make a chart up.
> From this chart I can then do a CAD drawing with spoked lines directly entered
> from the chart just as you have stated.
>
> About the only way our methods differ in in the collection of the initial data.
> This method also works for face cams where the new cam is duplicated by using
> the side of the to and the blank is ran in a 4th axis.
>
>
> John S

Ooops forgot to add that I take a reading off at every 5 degree's with a dial gauge and enter the reading on the chart.
That part might not have been clear.

John S.

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>
> >
> > NEVILLE WEBSTER <nevillewebster@...> wrote:
> > hi ian,
> >
> > you could try PEDIT pick the line then use FIT as the option this will smooth
> > the polyline but keep all the critical highs and lows
> >
> > Good luck
> >
> > Neville
> >
> > xj5373 <ian.c.haynes@...> wrote:
> > Firstly, many thanks for all the help with the ELCB problem.
> >
> > My miller spends a lot of its time making patterns for lost wax
> > casting parts for obsolete engines mainly associated with Morgan
> > Three Wheelers and now and then the odd exotic motorbike.
> > Latest idea is to make cams. A colleague is planning to draw the cams
> > 5 times life size on paper (probably a bit of magic goes into this
> > step....) so step one is to scan the drawing into the PC and get a
> > JPG. I then want to convert to a CAD file so have come across IMG2CAD
> > which allows me to convert the scan to a DXF file. This then is
> > loaded into my copy of Autocad LT. The cam shape is a 3D polyline and
> > if you zoom in it is pretty bumpy. The plan then was to scale the
> > drawing back to normal size then feed the DXF file into Mach3 to
> > generate the G code. A dry run indicates that all this works but I
> > would like to smooth the polyline in Autocad LT before sending it to
> > Mach3.
> > My knowledge of Autocad is limited at best and I have had a poke
> > about looking for a command that will allow me to smooth the polyline
> > but so far no luck.
> > Does anyone have any advice on smoothing my scanned polyline cam
> > profile in LT or even a better idea on how to go about this?
> > Thanks
> >
> > Ian
> >
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