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Re: DIY Stencil Cutting Drag Knife Solution - Update 2!

PostPosted: Fri Aug 27, 2010 1:37 am
by airnocker
Quick Update everybody. Nix on the aluminum duct tape. I had to bite the bullet and CA the two ends back together.

I really like Tweakie's solution (http://www.tweakie.com) by having the knife spring loaded as well, see his Vinyl Cutting section. But for now an accurate, flat, flat, flat work surface works quite well.

Re: DIY Stencil Cutting Drag Knife Solution - Update 2!

PostPosted: Fri Aug 27, 2010 1:53 am
by michaelthomas
Cool.....its a fun hobby. You may be surprised at how inexpensive rc planes can be these days. I fly nothing but small (36" span) electric planes, and the cost for my planes is less than 100$ plus the radio and charger, and that's with 5 or 6 batteries (about 5$ each). I enjoy the little ones because i can fly them in the front yard on a whim if I want. There are a few of us on here that fly 3d.

My wife will never be comfortable with the idea of me in a small "real" aircraft, so even if it was free, I wouldn't be able to take advantage of it without causing her a great deal of stress......lol. I enjoy designing the little planes and building them. Here's a vid link of one of my hybrid designs in the school field.

http://www.youtube.com/watch?v=cXrDrENY76Q

Re: DIY Stencil Cutting Drag Knife Solution - Update 2!

PostPosted: Fri Aug 27, 2010 2:52 am
by airnocker
Yeah, it is a fun hobby. As I've always preferred scale, stand-off scale or semi-scale (like the Goldberg Chipmunk) I get no fun out of flying 3D foam profile planes, electric or otherwise. I switched to electric about 5 years ago along with downsizing wingspans from 60-70+ inches to 24-28" or so and going from balsa kits to foam ARFs. I love electrics with Li-Poly batteries and brushless motors. But the cost is still a wash. I can have $300 in a Alfa model when it's all said and done, not counting the transmitter, battery charger, on and on, Or go flying for almost 3 hrs.

My favorites are the ALFA WWII series http://www.aflamodel.cz . Here's an article I did on a P-51 mod http://www.rowlettrcclub.com/pmwiki.php?n=Main.AlfamodelP-51. The Corsair and the P-51 are my favorites. My links for my Corsair are here: http://www.rowlettrcclub.com/pmwiki.php?n=Main.Aug2004 . Some pics in this link have links to more pictures in the series.

Enjoy.

Re: DIY Stencil Cutting Drag Knife Solution - Update 2!

PostPosted: Fri Aug 27, 2010 3:18 am
by michaelthomas
That's pretty cool stuff, too....it sure is a diverse hobby. All my outdoor planes are balsa profiles, and I have a bunch of foamies for indoor in the winter. I pretty much only fly profiles.....because nothing else flies 3d quite like them. If it wasn't for 3d, I probably wouldn't have much interest in flying at all.....it's been a hell of a challenge for me and that is what I found appealing. I flew Giant Scalers for a while, but it was a real pain to travel with the stuff, and was way too expensive for me.

Thanks for sharing.

Re: DIY Stencil Cutting Drag Knife Solution - Update 2!

PostPosted: Fri Aug 27, 2010 6:05 pm
by bajaru
Right on, airknocker! It looks like you absolutely nailed it with that drag knife! Thanks again for posting.

-Brian

Re: DIY Stencil Cutting Drag Knife Solution - Update 3!

PostPosted: Sat Sep 04, 2010 3:27 pm
by airnocker
Another important update to this post. Read the starting posting above.

Re: DIY Stencil Cutting Drag Knife Solution - Update 4!

PostPosted: Tue Sep 07, 2010 6:57 pm
by airnocker
Thought you might want to know, I just received my "Roland" blade holder in the mail today. It's kind of cheap and the blade spring loaded movement is not anywhere as smooth as my design and the cost is about the same.

Re: DIY Stencil Cutting Drag Knife Solution - Update 4!

PostPosted: Sat Sep 11, 2010 9:57 pm
by airnocker
Dang! My deepest apologies for a typing error I just found in my last update. This error is now corrected.

The 2nd bearing was listed as a 4mm x 1.5mm bearing and should have been a 5mm x 1.5mm bearing.

Re: DIY Stencil Cutting Drag Knife Solution - Update 5!

PostPosted: Mon Sep 20, 2010 2:10 am
by airnocker
New updates to the first thread of this posting. Check it out.

Re: DIY Stencil Cutting Drag Knife Solution

PostPosted: Mon Sep 20, 2010 8:35 pm
by airnocker
bajaru wrote:Right on, let us know how it works out for you.

I would also be interested to find out how you secure the material down on the spoilboard. I have had 100% success cutting thin material using the method described here in good detail: http://www.cambam.co.uk/forum/index.php?topic=702.0 However, vinyl stock is so thin and flimsy, I'm not sure how to tackle the problem. Do you have any initial thoughts to try first?

-Brian


Hey Brian,

I had another brain spasm today on a great way to hold down vinyl or mylar (.0035") thin stock. I had a bunch of remnants from Duck brand Easy Liner adhesive shelf liner material. The stuff I had was .0085" thick, plus the backing paper of .004" for a total thickness of .0125".

As you can see from the picture, I cut out a rectangular piece of the backing from the shelf liner piece the size of my mylar material, then stuck the mylar to the sticky side of the shelf liner then taped the adhesive vinyl face down on my work surface. The mylar peels off easily with no residue and the adhesive vinyl material serves as a good backing during drag knife cutting. The green lines on either side of the beige area is the backing paper left in place. The beige area is the adhesive side of the shelf liner vinyl. The frosty ends sticking out beyond either end of the beige area is my mylar material I will cut.

Adhesive Vinyl Mylar Hold-down.JPG
Using adhesive shelf liner for holding vinyl or mylar stock


Brain farts, gotta love 'em.