CC Cyclone
|
| posted on 15/3/15 at 07:18 PM |
|
|
Producing body in cad from paper drawing
Hello All,
I'm tackling a new project, have the chassis built and now need to make a buck. The plan was to go down the plywood egg crate with foam infill
and then take moulds from the buck.
Now the car in question is an historic racer / replica that isn't in production and although I could hand form the shape over a very long period
of time, I am looking into cutting plywood sections every few hundred millimetres from a cad drawing. Now here is the bit I need help with: I have a
JPEG image that shows a 3d wire frame in three quarter view of the car in question, unfortunately I don't have a cad file and am really unlikely
to get my hands on one. My question therefore is this - is there any way if taking the 3/4 view, perhaps drawing over it in cad to create a 3d model
which I could then use to cut my cross sections through, or do these things usually get generated from 2d elevations of front / side / rear etc? The
only drawing I can find is the 3/4 view after months of searching and I don't know enough about 3d modelling. I do have wheelbase etc dimensions
which would in theory make it scale able?
So, good people of locostbuilders, does anyone know if what I am hoping to achieve is possible? If so any pointers as to who I may be able to approach
for a quote?
|
|
|
|
|
JC
|
| posted on 15/3/15 at 07:25 PM |
|
|
Draw the sections on paper, enlarge to full size using an overhead projector. Cut these from polystyrene and mount to chassis. Add filler, sand,
sand and sand, then mould! There's a thread on here somewhere describing it in detail....
|
|
|
CC Cyclone
|
| posted on 15/3/15 at 07:44 PM |
|
|
Thanks, that sounds like a plan, although I was thinking the ply might make it a bit more stable?
Still need to generate the sections from the drawing using this route and so my original problem still stands, I think.
|
|
|
liam.mccaffrey
|
| posted on 15/3/15 at 07:46 PM |
|
|
just as a matter of interest what is the car?
Are you able to post the pics that you have? It might give people a better impression.
When I was considering this I was lucky enough to find a front and side elevation of the Talbot lago T26C. I never followed through with the project,
but I may do in the future.
Build Blog
Build Photo Album
|
|
|
Sam_68
|
| posted on 15/3/15 at 07:49 PM |
|
|
Yes, it's possible.
I don't know of any software that will do it directly (doubtless it exists somewhere, but it will be very specialised).
But long, long ago - before 3D CAD was invented - we used to draw perspectives manually, by setting up the plan on a drawing board and projecting
dimensions up from focal point and vanishing points. You can use this technique manually on CAD to 'reverse engineer' 2D section profiles
from an image of a 3D wireframe.
How good the result will be depends on the resolution of your JPEG. You will need a very high resolution image and enough straight lines or
known points to project the vanishing points for it to be really worthwhile.
And it is a very tedious job, requiring someone who understands perspective, not just trained to push buttons on a CAD workstation (though
they'll need to know how to do that too).
I'm not even going to offer, 'cos I'm far too busy to take it on, but assuming your JPEG is of adequate quality to make the result
worthwhile, I'd suggest that you're looking at £several thousand at anything like commercial rates.
Others may be able to suggest a cheaper/quicker solution, if they know of, or have access to appropriate software.
|
|
|
designer
|
| posted on 15/3/15 at 07:56 PM |
|
|
You will get better answers if you name the car! Is it that secret.
Somebody, somewhere, might have the drawing you want!
|
|
|
CC Cyclone
|
| posted on 15/3/15 at 08:03 PM |
|
|
Can post the image I have tomorrow, it was a one off special / prototype.
|
|
|
Fred W B
|
| posted on 16/3/15 at 11:14 AM |
|
|
See story here
CANAMSA body
My opinion, getting it to look right, just from a single drawing will not be easy. If you need to pay someone to do it it will be expensive, if it can
be done at all.
Cheers
Fred W B
[Edited on 16/3/15 by Fred W B]
You can do it quickly. You can do it cheap. You can do it right. – Pick any two.
|
|
|
Mistron
|
| posted on 16/3/15 at 06:29 PM |
|
|
Cad? Who needs CAD?
Here's 3 of my projects
a previous project: http://myweb.tiscali.co.uk/racecar/pandora/body.htm
and my current one: https://www.flickr.com/photos/44645707@N00/sets/72157632087827009/
and one I helped with for a Porsche collector (It's a long thread, but here is a link to some pictures of an early itteration. we then went on
to make a 1/5scale model as it wasn't quite what he's wanted afterall....) :
http://www.ddk-online.com/phpBB2/viewtopic.php?f=3&t=28047&start=930
However long you think it will take, that will get you started. But it's a lot of fun, very satisfying, can be boring, itchy, dusty and
rewarding.
Go for it!
and if you need advice, feel free to ask
Al
[Edited on 16/3/15 by Mistron]
|
|
|
CC Cyclone
|
| posted on 17/3/15 at 08:41 AM |
|
|
Al,
I'm a big fan, I have to confess I'm a ddk member moonlighting on the LocostBuilders Forum. My project has a hint of Porsche content....
Thanks for the input guys, I have realised that actually as I have a rolling chassis I can go about this the old fashioned way with 2d paper and card
templates to flush out the shape. Will keep you posted.
|
|
|
Mistron
|
| posted on 17/3/15 at 07:56 PM |
|
|
haha, am I being stalked? or is it just that in the massiveness of the internet, the loonies always end up bumping into each other.
Needless to say, if you need any help / advice, just drop me a line and I'll help if I can
Al
|
|
|
