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Crossbow string (Read 7277 times)
squirrelslinger
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Re: Crossbow string
Reply #15 - Feb 19th, 2013 at 7:52pm
 
I love crossbow accuracy, but I hate the loading time and diffuculty.
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“Insanity is doing the same thing, over and over again, but expecting different results.”
"You don't think the electricity is off. You check it 3 times to make SURE its off"
"Remember, this is not a scalpel. It is a steel wedge that you will be slamming into knotty wood. Hone accordingly."
 
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Thomas
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Re: Crossbow string
Reply #16 - Feb 19th, 2013 at 7:59pm
 
jlassud

My shuttle “slider” design has gone through more than six revisions but the big accuracy breakthrough was the groove shape shown in pictures. This newest shuttle is made of uhmwpe and allows it and the string to be easily separated. The same material is used on the pressure pad at the top which keeps the shuttle from buckling before release. Another helpful feature which helped in my experiments is the replaceable groove track which is attached with spray adhesive. The track shown is of $1.50 rosewood cutoff from a local supplier.
     
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Thomas
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Re: Crossbow string
Reply #17 - Feb 19th, 2013 at 8:08pm
 

View of track profile      
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Thomas
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Re: Crossbow string
Reply #18 - Feb 19th, 2013 at 8:21pm
 
The release pin is at the far left in the slot. In other words the actual release hook “nut” is about 25mm behind the string. The steel ball projectile is seated in a 90deg cone at the right side.          
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squirrelslinger
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Re: Crossbow string
Reply #19 - Feb 20th, 2013 at 3:24pm
 
Dude. I love that thing. How did you make it? machined it? It looks VERY cool.
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“Insanity is doing the same thing, over and over again, but expecting different results.”
"You don't think the electricity is off. You check it 3 times to make SURE its off"
"Remember, this is not a scalpel. It is a steel wedge that you will be slamming into knotty wood. Hone accordingly."
 
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Thomas
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Rocks?

Posts: 292
NORTHEAST OHIO
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Re: Crossbow string
Reply #20 - Feb 20th, 2013 at 6:21pm
 
squirrelslinger

Other than a drill press for the holes, commercial bolts, dowel pins and steel plate
every thing else is hand done. The red item activates a magnetic auto safety. The stock “tiller” will not be shaped and finished until the tinkering is done. Lock was designed on a $28 Win 95 2d cad. By the way the steel bow “prod” is from Alchem.

Tom        
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innercase.jpg (346 KB | )
innercase.jpg
 
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jlasud
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Re: Crossbow string
Reply #21 - Feb 21st, 2013 at 3:19pm
 
Wow,serious piece of hardware,and workmanship!
I played around with my new toy,and i also used ~1" pieces of 1/2" thick dowel and put a 18g(bit more than half ounce) lead balls in from of them. The piece of dowel acted as a sabot,and i could shot like this,without any modification to the xbow.
I was building this,i though,i'm going to make a regular medieval crossbow,rather than a stone bow because with a sled i can shot bolts and ball ammo too.
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jlasud
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Re: Crossbow string
Reply #22 - Feb 21st, 2013 at 3:20pm
 
Loaded.
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squirrelslinger
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firepower

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Re: Crossbow string
Reply #23 - Feb 21st, 2013 at 5:22pm
 
Coolio! I now own a small 50 pound pistol crossbow, can put a 10 gram plastic bolt(with a metal tip Wink) through 1/4th plywood easily. Who said they were weak???
They penetrate my target deeper than arrows, and given the shafts are close to the same size (arrows a bit bigger) the darts MUST be moving faster to match penetration.
I am going to make some wood ones tonight, my cut-down 8 gram POC shafts will also penetrate, with no point of fletch.
-Squirrel
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“Insanity is doing the same thing, over and over again, but expecting different results.”
"You don't think the electricity is off. You check it 3 times to make SURE its off"
"Remember, this is not a scalpel. It is a steel wedge that you will be slamming into knotty wood. Hone accordingly."
 
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jlasud
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Programming stones

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Re: Crossbow string
Reply #24 - Feb 22nd, 2013 at 10:31am
 
The above one is ~170#
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Respect existance or expect resistance!
 
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squirrelslinger
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peace through superior
firepower

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Ky, USA
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Re: Crossbow string
Reply #25 - Feb 24th, 2013 at 9:06pm
 
Nice. I wound up using edited bamboo skewers( under 1 cent each:)) for me darts, clocked (by shooting alongside of an arrow of known FPS from my uncle's gun-testing assembly) at about >200 fps. the darts weigh less than 3 grams.
-Squirrel
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“Insanity is doing the same thing, over and over again, but expecting different results.”
"You don't think the electricity is off. You check it 3 times to make SURE its off"
"Remember, this is not a scalpel. It is a steel wedge that you will be slamming into knotty wood. Hone accordingly."
 
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