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Jan 09, 2007, 02:09 AM
dougmontgomery's Avatar
Yippee!

PDF- Airfoil Templates for hotwire


All you newbies to hotwire,Hope this helps a few out. I will be trying a few myself.
Doug
Last edited by dougmontgomery; Jan 09, 2007 at 02:15 AM.
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Jan 09, 2007, 06:52 AM
Glider guider
Speedo125's Avatar
Thanks Doug.
Jan 09, 2007, 05:15 PM
dougmontgomery's Avatar
Not a problem, I am getting a price on getting these water jet cut out of mild steel . PM me if interested. Doug
Jan 10, 2007, 09:28 AM
Registered User
A Major contribution!
Thanks Doug.
John255
Jan 10, 2007, 02:21 PM
dougmontgomery's Avatar

Thanks John255


Quote:
Originally Posted by John255
A Major contribution!
Thanks Doug.
John255
I appreciate it, appreciation makes it worth it.
(plus self gratification)
Doug
Jan 10, 2007, 02:42 PM
dougmontgomery's Avatar
Ok question number two. From the PDF, What would be the most wanted AG series airfoils?
I need numbers and requests to get these water jet cut. The first estimates were $3.00 per airfoil template(top and Bottom)60.00 per set of the PDF.

Unless everyone wants those sizes.
I personally would like
option 1
6" ag-04, 4" ag-11
7" ag-04, 5" ag-11
Doug
Jan 25, 2007, 11:02 PM
dougmontgomery's Avatar
Well i got some prices, for a full sheet it will cost me two blasters......ouch.

These are .063 mild steel.
I can get the aluminum in the equivalant for 25.00 a set, more to a cut sheet. but from what I have heard, aluminum sucks the heat right out of your cut wire, but I am not sure in this thickness.

I would like to see if anybody knows any cheaper water jet cutters, price per set-no shipping to me is 35.00. That isn't bad considering you get 5 sets of ag-04 from 4", 5",6"7" 8"
and 5 sets in ag-11.
thats a total of 20 pieces for 35.00 +s/h

is anybody interested, I need 20 purchasers to make the deal.

I asked them if they could send me a set to assure me the .dxf file didn't have any issues.
doug
Jan 25, 2007, 11:18 PM
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soholingo's Avatar
Doug,

Not trying to put a damper on your idea, but why steel/aluminum templates? Seems like overkill. FWIW I follow a lot of the stuff you do. Its always innovative...
Jan 25, 2007, 11:31 PM
dougmontgomery's Avatar
I can make positive templates for my builds myself, but I would like to try the compufoil designe templates for the thinner ag airfoils. These thin airfoils are a little more sensitive to MISTAKES when they are 3/8" to begin with. In the 100's of wings i have cut, a tapered thin wing is hard. especially when I just got the materials to try bagging a few.

Thanks for watching....let me know if you are interested in anything, I usually have a few extra somethings laser cut, or pods layin around. (including 3mm coroplast in 5 colors. doug
doug
Jan 25, 2007, 11:43 PM
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soholingo's Avatar
Why the water cut aluminum? Wouldn't laser cut get you the same accuracy?
Jan 26, 2007, 12:46 AM
dougmontgomery's Avatar

laser?


Quote:
Originally Posted by soholingo
Why the water cut aluminum? Wouldn't laser cut get you the same accuracy?
I have not researched the metal lasercutting. I am steering towards the mild steel though. maybe I will check into that, doug
Jan 26, 2007, 02:07 AM
Registered User
Stupid question of the day: wouldn't metal (aluminium in particular) templates cool down the wire hence causing all kinds of problems?
Jan 26, 2007, 06:11 AM
Registered User

Template cutting methods


Water jet will cut a much nicer edge than laser will because the water jet abrades the alum. away whereas the laser heats the material and a stream of gas blows the alum. away, not quite as precise control of the surface.

With a water jet you can get right down to a knife edge, none of the heat methods will go that fine or smooth.

You might see if someone could mill the templates for you on a CNC mill, milling is a whole lot cheaper process and in 1/16 alum. would go pretty fast.
Jan 31, 2007, 01:56 AM
Registered User

Wire Template Cutting Methodes


Find a shop that has a Wire EDM machine or a friend that works with one. These are by far more accurate than a water jet. +-.0002 in.
Jan 31, 2007, 02:30 AM
Registered User

How about water jet cutting phenolic?


Regarding the metal templates. Mild steel is only 1/5 as thermally conductive as aluminum, so that helps. The question does come up, though - could the water jet method work for phenolic or formica, etc?

Maybe splintering would be a problem? I have to imagine the water cutter's going to have no problem penetrating. Anyway, just asking. I admire your initiative and ingenuity in trying to source new template production methods.


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