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Post  batjac Sat Feb 05, 2022 3:37 pm

Well, the previous CL that I was making wasn’t doing it for me, and I have no interest in building FF models, so I needed something else.

But, as I said, the jig rib idea lets me do a model I've wanted to do for a while.  So I downloaded the plans for the Red Wing, from the December ‘64 Flying Models:

Something else Redwing
https://outerzone.co.uk/plan_details.asp?ID=12878


And I did up a set of files to cut the ribs.  Unfortunately, as a flying wing, it takes a LOT of balsa for the ribs.  The ribs being so big, it’s hard to efficiently utilize the sheets, so there will be a lot of wastage.  I figure I’ll use a total of five sheets of 1/16”, one sheet of ¼”, and some scrap 1/8” balsa.

Something else Red-Wing-Ribs





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Post  aspeed Sat Feb 05, 2022 4:45 pm

You could save the Kapok trees and make it out of the 1/4" fan fold foam (blue FFF) if you can find it. There is a plan here http://www.frostracing.com/spadtothebone.org/PDF/Diamond_Dust.pdf for a larger coroplast one that you could substitute the foam foe using the plan from OZ for size. Just a thought.
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Post  batjac Thu Feb 10, 2022 10:40 pm

Well, that didn’t work….  

I made time last night to cut the ribs for this project.  They came out pretty good.


Something else 20220209-233843
Something else 20220210-002116



You can see that the rib pairs are perfectly matched without a lick of sanding.  I couldn’t do that by hand without a lot of slow and careful sanding.


Something else 20220210-011602



Then I tried to make my jig ribs.  The ribs in my .svg file are dashed along the rib outline, as you can see above.  That way, I can just pop out the L.E., T.E., and spar cutouts and slide the sticks through the holes to jig up the wing while I build.  Then, once the wing is complete, I just cut along the dashed line and the wing is free and in perfect alignment.  But, even though my .svg file has dashed lines around the rib outlines, the Cricut machine cut them as solid lines:


Something else 20220210-035251


Confusing, but “Oh, well”.  No biggie.  I’ll just tape the ribs in place in the jig.  That should hold them while I build the wing, and then I can just peel away the tape when I’m done.  I’ll have to do some more experimentation to get the dashed lines to cut like I want.

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Post  batjac Sat Feb 12, 2022 4:27 am

Here's the video of the wing ribs being cut.  The ribs range in size from 5.25 inches to 14 inches long.





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Post  getback Sat Feb 12, 2022 4:47 am

Looks like you bought got this thing wiped to do what you want , is that the same machine ? with upgrades ?
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Post  batjac Sat Feb 12, 2022 2:56 pm

getback wrote:Looks like you bought got this thing wiped to do what you want , is that the same machine ? with upgrades ?

Standard Cricut Maker machine, just as it came out of the box from Hobby Lobby.  I have a couple of experiments on how to try and make the machine cut 1/8" balsa, it's rated for 3/32" max, but that's for another day.

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Post  Ken Cook Sat Feb 12, 2022 4:10 pm

Mark, that's most impressive how it can cut circles across grain as it does. What is actually holding the parts in place as they're being cut? I see you had to ease the parts off of the mat.
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Post  batjac Sun Feb 13, 2022 3:07 am

Ken, the mat that the balsa is on has a sticky surface. There are different levels of stickiness. The purple mats are the "stickiest" mats you can get for the Cricut machines, and that's what we need for doing balsa.

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Post  Ken Cook Sun Feb 13, 2022 7:12 am

Mark, my next question is how do you plot the pieces on the sheet. In other words, is it possible to orientate grain direction?
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