[R-390] 390/390a gear train

[Cecil Acuff]

To add to what BW has said...I'm not a production pro but I don't think it 
is as easy as just dumping a CAD drawing into a CAM machine and out pops new 
gears and what not.  My brother is in that business with Volvo...I'll pick 
his brain on that part.

To document and display the gear train I think it's a good idea for the 
printed page but not as good as one might expect for a computer screen 
displayed version of the gear train because of the proprietary nature of 
most of the programs that generate output.  You pretty much have to own a 
copy of the software used to generate the graphics to display the graphics. 
Most of these programs are expensive.

We have the same problem in the workplace.  Our engineers use AutoCAD. 
Problem is the guys that use the drawings in the field can't display them 
without having a version of AutoCAD on their laptops...too expensive and not 
intuitive at all.  We like Visio in the field because it's easy and fairly 
cheap to distribute to 100 folks.  The engineers don't like it because it 
won't do what they like to do.  We went to another product...can't remember 
what it was....but it would allow you to view an Acad file but you couldn't 
make any changes....so much for field modified "as built" drawings.  Then 
that company quit supporting the product.  It's a nightmare...and none of 
that even touches manufacturing....it gets deeper as I understand it!

Cecil....
----- Original Message ----- 
From: "bw" <ba.williams at charter.net>
To: <r-390 at mailman.qth.net>
Sent: Wednesday, December 14, 2005 6:53 PM
Subject: Re: [R-390] 390/390a gear train


>
>>> 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
>
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