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Aug 19, 2015, 02:45 PM
Retired CAD guy
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CNC plywood & e- mail workaround


OK I think I have a handle on this job.

I've spent a couple of hrs fooling around with CAD and Tracing the formers.
I had to convert the PDF to a Bitmap to place in the background of CAd to do the tracing.

Then I NESTED or arranged the parts on a standard sized piece of Ply.
Next I offset all the lines by 1/2 the bit width ( I used a 1/16" bit so .03125" )

To keep from breaking those small 1/16 dia bits I set my machine speed down to .5" IPS
and it took ~ 30 Mins to cut what you see on the pic below.
Two set per sheet.
Plus I did a little orbital sanding on the top size to remove most of the fuzz.
I'll also try to cut down the sheeting to fit in a smaller box

So IF I got $25 / hr that'd be $50 for the CAD drawing and Set up time.
The cutting would be $12 and the ply ~$10

So,
$72 for the 1st set. + shipping
but only
$22 for the next set. + shipping. ( no set up charge )

I have 8 sheets of 3 ply birch ply wood coming from my supplier. @ $10 per sheet.

On looking at the real parts I question my SCALE of the "K" part !
How long is that part on your Paper Drawing?

Bob
cell 317-650-3202
Last edited by birdofplay; Aug 28, 2016 at 03:28 PM. Reason: additions
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Aug 19, 2015, 07:08 PM
Registered User
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Quote:
Originally Posted by birdofplay
OK I think I have a handle on this job.

I've spent a couple of hrs fooling around with CAD and Tracing the formers.
I had to convert the PDF to a Bitmap to place in the background of CAd to do the tracing.

Then I NESTED or arranged the parts on a standard sized piece of Ply.
Next I offset all the lines by 1/2 the bit width ( I used a 1/16" bit so .03125" )

To keep from breaking those small 1/16 dia bits I set my machine speed down to .5" IPS
and it took ~ 30 Mins to cut what you see on the pic below.
Two set per sheet.
Plus I did a little orbital sanding on the top size to remove most of the fuzz.
I'll also try to cut down the sheeting to fit in a smaller box

So IF I got $25 / hr that'd be $50 for the CAD drawing and Set up time.
The cutting would be $12 and the ply ~$10

So,
$72 for the 1st set. + shipping
but only
$22 for the next set. + shipping. ( no set up charge )

I have 8 sheets of 3 ply birch ply wood coming from my supplier. @ $10 per sheet.

On looking at the real parts I question my SCALE of the "K" part !
How long is that part on your Paper Drawing?

Bob
cell 317-650-3202
Hi Bob,
The K3 runs nose block to tip of tail, the Keel of the craft. 46.250
The short box around the formers in my original is half size at 11" long.
The long box of formers is half size at 18" long.
The short side of the trapezoid dihedral gauge is half size at 0.750"
The long side of the trapezoid dihedral gauge is half size at 1.00"
B10 diameter is half size 2.125"
These measurements made on my original drawings. I stated half size because that is the way they are drawn on the original plan and marked as '1/2' Scale
If you need any more let me know!
Jerry
Aug 19, 2015, 07:17 PM
Registered User
justj's Avatar
Hi Bob,
I overlooked the fact that you asked me about K2 not K3..... duh,,
The K parts are 1:1, full size. It's only the formers that are '1/2 Scale'.
Some days I'm just a little slow, others........
Jerry
Aug 19, 2015, 07:22 PM
Registered User
justj's Avatar
today is one of 'those' days!
K-2 is 16 - 5/8"
K-1 is 2 - 5/16"

Jerry
Aug 28, 2016, 03:27 PM
Retired CAD guy
birdofplay's Avatar
Thread OP

3D Milling jobs and 3D CAD modeling


I've had ocassion to do some interesting 3D Milling with my CNC machine lately.<BR>
Things that can't be Hot wired.<BR>
Things like a B-70 Nose, Flying wing & Glider fuselage.<BR>
Mostly it's been custom work from existing 3D Models.<BR><BR>
If you have a 3D project that you want 3D Milled from Foam<BR>
just drop me a line and we can discuss the project.<BR><BR>
I'm only charging $25 / hr, cutting cost, plus material cost & shipping.<BR>
That's if you have an existing 3D CAD model that I can easily develop a tool path from<BR>
<BR>
I will entertain 3D CAD work as well for the same hourly rate.<BR>
I use Rhino and can import many popular design file types.<BR><BR>
Just let me know how I can help with your project.<BR>
<A HREF="mailto:[email protected]">E-mail me at [email protected]</A><BR>
or PM me at birdofplay within RGroups.com<Br>


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