[R-390] 390/390a gear train

[bw]

>> Joe Foley ask any chance anyone would like to do CAD
>> drawings
>> of the gears and cams?
>> 
>> Page 50 figure 30 Tuning system, simplified
>> mechanical diagram of TM
>> 11-5820-358-35 has a fair cartoon of the gear train
>> for the R390A.
>> 
>> How about we get someone to do a good scan or photo
>> of that figure and get up
>> on Al's R390 page.
>> 
>> Could we find the equivalent one for the R390?
>> 
>> But then if someone wants to go into history as the
>> Fellow that did a CAD
>> drawing of the R390 gear train here is your
>> invitation to immortality.
> +++++++
> You betcha!  My idea was that the file would then be
> ready to dump into a CAM equipped machine that could
> then spew forth finished gears, the programming being
> the expensive part.
> 
> Joe

Joe,

Are you talking about the exploded parts diagram? I checked my files and
have the 3 page diagram scanned, pieced together, and cleaned up. I use it
to zoom in, but it prints well too. I have several versions if that is what
you mean. I have one that is probably around 500k, and the full rez version
that weighs in around 2 mb.

I spent a lot of time doing 3D CAD a few years back and still have 3 or 4
software packages here. The main program is Alias Sketch by Alias Research,
but I also have a nice, fast one called Swivel 3D by the forerunner company
that later became Macromedia. It has a companion rendering system called
Renderman by Pixar. The problem is the work load. I spent a few evenings
experimenting with some of the gears when we first started the Y2K manual.
It looked to be several weeks, if not more than a month of work to get it
right. One of the problems with doing it as a 3D CAD work is that the true
value lies with everyone having the same CAD program to manipulate it all,
explode the parts, rotate it to look-see, etc. Otherwise, it would produce a
rather nice file like the existing exploded parts figure only with shading,
customized parts placement, etc. Another and better idea, IMO, is to do a
full illustration file. That I could do also as that used to be my job, but
I would only start it if I knew it would be of value to everyone. Still,
doing gears is a beach of a job. I once did a fully shaded 3D cutaway of an
Allison turbine engine and that took more than a month at a job that was
only 4 hours a day. The computer I used was a 33 Mhz job. Yes- thirty three
Megahertz. I still have that file. Anyway, this approach would produce a
very nice file that could be saved out at a TIFF or PDF. It could be changed
around and customized further if that was needed too.


Barry