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Cutting_Carbon Spars
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Steve D



Joined: 02 Sep 2003
Posts: 513
Location: USA GA Newnan

PostPosted: Tue Feb 10, 2004 7:55 am    Post subject: Cutting_Carbon Spars Reply with quote

Mornin' folks.

I need to shorten the spars for della porta #2 since I made the sail a little smaller than the original dimensions. I'm using Avia Carbon. I don't have access to a spar cutter but can probably get my hands on a Dremel tool and can get a hack saw for sure. Any tips on how to go about it? Seems I remember reading to wrap the spot I want to cut with tape to prevent splintering...

Thanks for the help...
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Kitesquid
Master Kite Builder
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Joined: 29 Aug 2003
Posts: 983
Location: USA Virginia King George

PostPosted: Tue Feb 10, 2004 8:27 am    Post subject: Reply with quote

The best way I have found is to use an abrasive wheel...no taping is nessesary.

You can find them to fit your dremel.

If you cant find one, you can use a FINE tooth hack saw, like 36 TPI or higher. 50 TPI is better...

Wrap the area to be cut with electrical tape and slowly cut the spar.

Rotate it so you are cutting twards the center of the spar..

Take your time.
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AKA Harold
King George VA

P.S. The wind is like the air, only pushier.
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Steve D



Joined: 02 Sep 2003
Posts: 513
Location: USA GA Newnan

PostPosted: Tue Feb 10, 2004 9:14 am    Post subject: Reply with quote

Thanks Squid! Just the info I was looking for...
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Kitesquid
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Joined: 29 Aug 2003
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Location: USA Virginia King George

PostPosted: Tue Feb 10, 2004 9:34 am    Post subject: Reply with quote

Glad I could help...

I have also heard of people scoring a pultruded Carbon or fiberglass tube with a sharp knife and breaking them, but I have not tried this approach, so I cannot vouch for it, and I am not willing to try it except maby on some scrap....
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KiteSquid
AKA TakoIka
AKA Harold
King George VA

P.S. The wind is like the air, only pushier.
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Steve D



Joined: 02 Sep 2003
Posts: 513
Location: USA GA Newnan

PostPosted: Tue Feb 10, 2004 9:57 am    Post subject: Reply with quote

Anyone recall which thread it was that had photos of a couple of types of spar cutters? One was the version Steve sells and the other was a home-grown version made with a metal ruler and a small cut-off saw...
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kitepoor



Joined: 05 Sep 2003
Posts: 125

PostPosted: Tue Feb 10, 2004 11:00 am    Post subject: Reply with quote

for a field repair, I just scored the outside with the file on my leatherman tool and snapped it off. Ugly, but at least I got a kite back in the air. It amazes me how much stuff can screw up on the first flight of a new kite!!!! (Of course that could be because I don't know what I am doing!)
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How come the nicest kite weather comes
when I have the most work to do
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Steve D



Joined: 02 Sep 2003
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Location: USA GA Newnan

PostPosted: Tue Feb 10, 2004 11:04 am    Post subject: Reply with quote

kitepoor wrote:
(Of course that could be because I don't know what I am doing!)


Me neither Randy, but I'm having a lot of fun trying anyway!!!
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Kitesquid
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Joined: 29 Aug 2003
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Location: USA Virginia King George

PostPosted: Tue Feb 10, 2004 12:20 pm    Post subject: Reply with quote

Steve D wrote:
kitepoor wrote:
(Of course that could be because I don't know what I am doing!)


Me neither Randy, but I'm having a lot of fun trying anyway!!!


I'm in that boat too, but I am just rowing in circles Laughing
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KiteSquid
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AKA Harold
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P.S. The wind is like the air, only pushier.
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Wills4th



Joined: 17 Sep 2003
Posts: 8
Location: USA VA Waynesboro

PostPosted: Tue Feb 10, 2004 12:47 pm    Post subject: Reply with quote

I couldn't find hack saw blades with fine teeth. I happened to be in a model shop one day and saw what looked like a knife, but on closer examination it was a saw blade - FOR METAL Shocked and came in either 40 tpi or 54 tpi. Cost of the blade and a handle was about 12 Bucks US.

Now I have a portable spar cutter, doesn't need electricity so it works on the kite field, and leaves a very smooth cut end.
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kitepoor



Joined: 05 Sep 2003
Posts: 125

PostPosted: Tue Feb 10, 2004 2:59 pm    Post subject: Reply with quote

Hey you live close to me. What store was that anyway?
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Randy
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stevef
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Joined: 27 Aug 2003
Posts: 541
Location: USA PA ALLENTOWN

PostPosted: Tue Feb 10, 2004 5:37 pm    Post subject: Reply with quote

kitepoor wrote:
for a field repair, I just scored the outside with the file on my leatherman tool and snapped it off. Ugly, but at least I got a kite back in the air. It amazes me how much stuff can screw up on the first flight of a new kite!!!! (Of course that could be because I don't know what I am doing!)


YIKKES! Shocked Does that work??? I'd be affraid of many splinters. I have a small hand spar saw that I use when I am far away from our shop. I've been selling these for like 10 years and nobody ever asked me how many teeth the blades had per inch... all I knew was that they were for metal and cut Graphite great. I looked at the packaging and there is no metntion of tpi.... so I squinted, and squinted, uncrossed my eyes and tried to count them.... I think I need bifocals.

Anyway... It looks like my blades are 30-36 teeth per inch.

When ever you cut always rotate the spar into the blade. If you are using a hand saw like above, cut a little, rotate the spar and cut a little more, then rotate again cut, rotate, cut etc..... That way you should not have a problem with splinters... as long as your blade is sharp (always buy extras). I have heard that some people wrap the spar with tape and then cut through the tape.... but I never tried it.

Sometimes I cut the spars a little longer than I need, and then finish them off on the disk sander.

If you are cutting a lot of fiberglass your can band them together and use a wet saw like you use for tile cutting. The "wet" keeps the dust down.
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A very big, public applause to kitenerd and his Della Porta project. Great Job Arnold!
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Mountain Man



Joined: 04 Sep 2003
Posts: 458
Location: NB Canada

PostPosted: Tue Feb 10, 2004 6:07 pm    Post subject: Reply with quote

in the shop I use the band saw ! I wrap tape around then cut ! but I also turn slowly so that it will be scored all the way around before cutting trought!

On the field I have a small hack saw or metal blade saw ! it work super ! I have made a block of wood to cut ! I will put a pic tomorow ! it as a small v cut in the piece of wood to sit the spar in ! Here again I wrap a piece of tape any kind .... then cut turning the spar as I go ! always get a clean cut !

I use a fine sandpaper to finish it and round the ends a bit to remove the sharp ness !

hope this helps! Wink
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Charles Bojarski
Kite Builder II
Kite Builder II


Joined: 26 Sep 2003
Posts: 33
Location: USA PA Philadelphia

PostPosted: Tue Feb 10, 2004 7:37 pm    Post subject: Cutting Carbon Spars Reply with quote

I found that both a Snap Saw by Atlas or either the fine or rough X-Acto saw blades work fine. I wrap the area with masking tape first and cut slowly.

Both types of saws are available thru you local hoppy sho.

Good winds...CharlieB
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knotronda
Kite Builder II
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Joined: 22 Jan 2004
Posts: 82
Location: Lincoln City, OR USA

PostPosted: Tue Feb 10, 2004 10:54 pm    Post subject: Reply with quote

There really is no need for me to put my two cents worth in but I'm a girl and I just wanted you all to know I was here. (hahahahaha)

I have a wonderful cutting block my husband made of HDPE (High Density Poly Ethyleen (sp?)). It has a grove down the center and also has a piece that slips over the spar to keep fingers from the cutting action. I have a fine toothed exacto saw and I rotate the spar as I make my cuts. (Not bad for a girl?!!?!)

If you don't have sanding paper around, you can use an emory board. They are cheap and portable. I keep a few in the kite kit.

knot(ty)ronda
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stevef
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Joined: 27 Aug 2003
Posts: 541
Location: USA PA ALLENTOWN

PostPosted: Tue Feb 10, 2004 11:31 pm    Post subject: Reply with quote

knotronda wrote:


If you don't have sanding paper around, you can use an emory board. They are cheap and portable. I keep a few in the kite kit.

knot(ty)ronda


Is that one of those things you can also use to do your nails?
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