Band Rips 4 times with 4 shots.

Discussion in 'General Slingshot Discussions' started by EyAlter, Jan 5, 2013.

  1. EyAlter

    EyAlter New Member

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    Today I finished my first slingshot. I attached the bands to the fork with pieces of wood that put pressure on it. The Puch is made out of leather and two 5mm holes. I pulled through the bands and fixed them with yoyo string and a constiction knot. I just pulled them a little and both bands ripped. Then I made new ones and attached them with tiny pieces of rubber instead but they ripped again. The second time they riped 2cm away from the knot. What am I doing wrong?<br><br>My Bands are 45cm long and 3cm wide. Should I make two 1.5cm wide ones instead?
     
  2. MaddyMax

    MaddyMax New Member

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    so there are many questions.<br><br>ripped after how many shots?<br><br>what kind of bands?<br><br>weight of ammo?<br><br>did you roll up and prestretch the bands when doing the constrictor knot?<br><br>...
     

  3. EyAlter

    EyAlter New Member

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    ripped after how many shots? <br>One Stretch- Repair<br>First Shoot-Repair<br>Second Shoot- Repair<br>Third Shoot- no more repair<br><br>what kind of bands?<br>Thera Band Gold<br><br>weight of ammo?<br>4g<br><br>did you roll up and prestretch the bands when doing the constrictor knot?<br>They were not tidy or anything kinda bunched up. The Bands were a little bit stretched when doing the knot.
     
  4. MaddyMax

    MaddyMax New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>EyAlter wrote:</b></span></td></tr>
    <tr><td class="quote">They were not tidy or anything kinda bunched up.</td></tr>
    </table>
    <span class="postbody"><br>???<br>i meant rolling/furl/folding the bands into itself then pulling it through the pouch hole then fold it back and then make constrictor knot.<br><br>try another string than your yoyo string.<br><br>even waxed jute twine that i once tried made less damage to my bands.<br><br>maybe some talcum might help.<br><br>or try other methods:<br><br><a href="http://theslingshotforum.forumotion.com/t2075-pouche-attachment-for-flatbands" class="postlink">http://theslingshotforum.forumotion.com/t2075-pouche-attachment-for-flatbands</a><br><br><a href="http://theslingshotforum.forumotion.com/t394-schnurlos-am-leder" class="postlink">http://theslingshotforum.forumotion.com/t394-schnurlos-am-leder</a></span>
     
  5. EyAlter

    EyAlter New Member

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    Does the Band have to be tidy? Is it worth using more but narrower bands and to stack them up? Could it be that cutting the bands with (brand new expensive sharp) scissors damages the edges?
     
  6. Arturo Borquez

    Arturo Borquez Administrator

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    Something is going very wrong with your bands ... can you post pics to see the broken bands and attachments ...
     
  7. jakerock

    jakerock New Member

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    Sounds weird...<br>I am guessing that the rubber is getting abrasions while you are tying it.<br>Are you using clamps or anything sharp?
     
  8. JoergS

    JoergS Administrator

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>EyAlter wrote:</b></span></td></tr>
    <tr><td class="quote"> Could it be that cutting the bands with (brand new expensive sharp) scissors damages the edges?</td></tr>
    </table>
    <span class="postbody"><br><br>Scissors don't work. <br><br>You MUST use a roll cutter.<br><br>The tiniest nick in the bands will cause INSTANT tearing. Nicks are unavoidable if you use scissors, as you can't do one continous cut. <br><br>Buy a roll cutter plus a cutting mat and the problem is solved.</span>
     
  9. jakerock

    jakerock New Member

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    <strong>How To Cut Pouches & Bands (DGUI)<br>(band cutting starts @ 5:25)<br></strong><br><br><embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/INVo_ShbaY0" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed>
     
  10. mhpr262

    mhpr262 Member

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    a good rollcutter is a must (an OLFA 45mm for example), but I do all my cutting on old magazines (the kind with the heavy, glossy kind of paper, not newspapers or the like. Old Playboy magazines work quite well :-D) instead of on a cutting mat. It works just as well and it costs you nothing. Once you have too many cuts in your surface you just tear out the first ten or fifteen pages and voila you have a brand new cutting surface.
     
  11. von_z2

    von_z2 New Member

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    <div>Scissors are definitely the problem. </div><div class="clear"></div><div class="signature_div">
    <br>"non impediti ratione cogitationis" <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
    </div>
     
  12. beaverman

    beaverman New Member

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    i dont think its the scissors. using scissors will shorten band life, but it should not make them break after just stretching once.
     
  13. von_z2

    von_z2 New Member

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    <div>
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>beaverman wrote:</b></span></td></tr>
    <tr><td class="quote">i dont think its the scissors. using scissors will shorten band life, but it should not make them break after just stretching once.</td></tr>
    </table>
    <span class="postbody"><br><br>Not if it isn't a perfectly straight cut. Like Joerg said, one little nick in the edge of the band = instant tear. My other guess would have been that he has sharp edges on his fork tips, but that's not where they are tearing.</span>
    </div><div class="clear"></div><div class="signature_div">
    <br>"non impediti ratione cogitationis" <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
    </div>
     
  14. JoergS

    JoergS Administrator

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>mhpr262 wrote:</b></span></td></tr>
    <tr><td class="quote">Old Playboy magazines work quite well :-D) instead of on a cutting mat. It works just as well and it costs you nothing. </td></tr>
    </table>
    <span class="postbody"><br><br>I used old magazines as well at first. It works, but the paper dulls the blade much quicker than a cutting mat. Blades for roll cutters are very expensive. A self healing cutting mat lasts a long time (I still use my first one, and it is in good condition). <br><br>In other words, a cutting mat pays for itself in a very short time. </span>
     
  15. mhpr262

    mhpr262 Member

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    Hmm, for some reason that never occurred to me ... I have just looked at the prices for 45mm replacement blades and for cutting mats, seem like the mat would really be a better deal. I thought such a mat would cost around 40&euro; or something, but they can be had much cheaper.<br><br>I used to collect knifes and visit knife forums a long tme ago and I remember an interesting post about paper being really bad for your edge because the weight of some paper consists of more than 40% ground up minerals (ie stone) as it makes the paper smoother and heavier (paper is sold by weight in the industry). It was really surprising, weird that I have forgotten about it.
     
  16. beaverman

    beaverman New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>von_z2 wrote:</b></span></td></tr>
    <tr><td class="quote">
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>beaverman wrote:</b></span></td></tr>
    <tr><td class="quote">i dont think its the scissors. using scissors will shorten band life, but it should not make them break after just stretching once.</td></tr>
    </table>
    <span class="postbody"><br><br>Not if it isn't a perfectly straight cut. Like Joerg said, one little nick in the edge of the band = instant tear. My other guess would have been that he has sharp edges on his fork tips, but that's not where they are tearing.</span>
    </td></tr>
    </table>
    <span class="postbody"><br><br>ive cut with scissors, even really bad quality ones and they did not break on the first shot.</span>
     
  17. EyAlter

    EyAlter New Member

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    Thanks I will buy a roll cutter but my next try will be in 3 months. Hollidays : ) <br>I wont use a cutting mat. I just buy a new desk if it gets scratched.
     
  18. Arturo Borquez

    Arturo Borquez Administrator

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>EyAlter wrote:</b></span></td></tr>
    <tr><td class="quote">Thanks I will buy a roll cutter but my next try will be in 3 months. Hollidays : ) <br>I wont use a cutting mat. I just buy a new desk if it gets scratched. </td></tr>
    </table>
    <span class="postbody"><br>a cutting mat is cheap !!! and a way better that a wooden desk? ... you can run with the same problems specially if you cut over wood ...</span>
     
  19. EyAlter

    EyAlter New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Arturo Borquez wrote:</b></span></td></tr>
    <tr><td class="quote">
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>EyAlter wrote:</b></span></td></tr>
    <tr><td class="quote">Thanks I will buy a roll cutter but my next try will be in 3 months. Hollidays : ) <br>I wont use a cutting mat. I just buy a new desk if it gets scratched. </td></tr>
    </table>
    <span class="postbody"><br>a cutting mat is cheap !!! and a way better that a wooden desk? ... you can run with the same problems specially if you cut over wood ...</span>
    </td></tr>
    </table>
    <span class="postbody"><br><br>Thanks, but that was a joke. </span>
     
  20. von_z2

    von_z2 New Member

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    <div>
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>beaverman wrote:</b></span></td></tr>
    <tr><td class="quote">
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>von_z2 wrote:</b></span></td></tr>
    <tr><td class="quote">
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>beaverman wrote:</b></span></td></tr>
    <tr><td class="quote">i dont think its the scissors. using scissors will shorten band life, but it should not make them break after just stretching once.</td></tr>
    </table>
    <span class="postbody"><br><br>Not if it isn't a perfectly straight cut. Like Joerg said, one little nick in the edge of the band = instant tear. My other guess would have been that he has sharp edges on his fork tips, but that's not where they are tearing.</span>
    </td></tr>
    </table>
    <span class="postbody"><br><br>ive cut with scissors, even really bad quality ones and they did not break on the first shot.</span>
    </td></tr>
    </table>
    <span class="postbody"><br><br>That may be but you use 30 bands per side, so the couple of bad ones have a lot of support...</span>
    </div><div class="clear"></div><div class="signature_div">
    <br>"non impediti ratione cogitationis" <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
    </div>