Spectra and Dyneema are brand names for high molecular weight polyethylene (HMWPE or HMPE). It is used for fishing lines, kite lines, standing rigging and control lines in sailing, and as wire-rope replacement in winching and lifting applications (and other applications such as body armour).<div><br></div><div>It is light (less dense than water) and very strong. It has excellent resistance to abrasion, UV and many chemicals. It hardly stretches at all, but does creep under high load. It is very slippery.<div><div><br></div><div><div>Some of these characteristic might make it less suitable for your application:</div><div><br></div><div>It is very slippery, much more so than nylon fishing lines, so it difficult to join. It is possible to splice the ends together to make an endless loop -- a small loop is sometimes used on boats as a 'soft shackle'. There are instructions around for splicing.</div><div><br></div></div><div>Control lines for yachts are usually covered in a sheath made from a different material, so that it is possible to grip the rope. Other boatings applications (eg. stays, soft shackles, winch cables) are usually bare.</div><div><br></div><div>You can buy the stuff in various different sizes from different sports shops: fishing shops, kite shops, boat shops, etc. Fishing braid is usually thinner, while boat control lines range from 2 mm up to 14 mm. </div><div><br></div></div><div>Boat shops (Boat.net.nz, Oborns, Burnsco) have sizes from 2 mm diameter up to 12 or 14 mm. <br><div><br></div></div><div><div>Stephen Irons</div><div><br></div><div><br>On Mon, Sep 25, 2017 at 1:55 PM, Andrew Errington <erringtona@gmail.com> wrote:<br>
<blockquote type="cite"><div dir="auto"><div>Thanks Jeremy. A quick Google gets me some local suppliers and places to look.</div><div dir="auto"><br></div><div dir="auto">My problem may then come down to tensioning the cord. We'll see.</div><div dir="auto"><br></div><div dir="auto">Thanks,</div><div dir="auto"><br></div><div dir="auto">Andrew<br><div class="gmail_extra" dir="auto"><br><div class="gmail_quote">On Sep 25, 2017 1:31 PM, "Jeremy Reeve" <<a href="mailto:jsr73@uclive.ac.nz">jsr73@uclive.ac.nz</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div id="m_-6187248624543867550divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif" dir="ltr">
<div id="m_-6187248624543867550divtagdefaultwrapper" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif,Helvetica,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols" dir="ltr">
<p><br>
</p>
<p>Hi Andrew,</p>
<p><br>
</p>
<p>I know some people who used something called Spectra Line as a drive for their Cerberus delta type printer (1m tall). <a href="http://www.spectrafishing.com/" class="m_-6187248624543867550OWAAutoLink" id="m_-6187248624543867550LPlnk942338" target="_blank">http://www.spectrafishing.<wbr>com/</a>
It's a fibre rather than monofilament. There are some special grooved bobbins available to fit stepper motors but I don't know where they came from. Maybe getting the required tension is still a problem for your application though.</p>
<br>
Jeremy</div>
<div id="m_-6187248624543867550divtagdefaultwrapper" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif,Helvetica,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols" dir="ltr">
<br>
<br>
<div style="color:rgb(0,0,0)">
<hr style="display:inline-block;width:98%">
<div id="m_-6187248624543867550divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Chchrobotics <<a href="mailto:chchrobotics-bounces@lists.ourshack.com" target="_blank">chchrobotics-bounces@lists.<wbr>ourshack.com</a>> on behalf of Andrew Errington <<a href="mailto:erringtona@gmail.com" target="_blank">erringtona@gmail.com</a>><br>
<b>Sent:</b> Monday, 25 September 2017 10:00 a.m.<br>
<b>To:</b> Christchurch Robotics<br>
<b>Subject:</b> Re: [chbot] Banggood?</font>
<div> </div>
</div><div class="quoted-text">
<div>
<div dir="auto">Thanks everyone. I'll start using them.
<div dir="auto"><br>
</div>
<div dir="auto">As I said, I have never had a problem with DX, it's just that they aren't stocking the esoteric items I'm looking for.</div>
<div dir="auto"><br>
</div>
<div dir="auto">At the moment I am looking for GT2 belt (as used in 3D printers) in white, because I am going to use it for automatic curtains, and black would look bad.</div>
<div dir="auto"><br>
</div>
<div dir="auto">DX has 10m in black (only) for $8, BG has it in white for $12. DX has no stock of the GT2 pulleys, BG has all the popular variants.</div>
<div dir="auto"><br>
</div>
<div dir="auto">I have also noticed a few guys on TradeMe are reselling a lot of the cool modules, parts, and tools that you see on the Chinese sites. I ordered some black GT2 belt and some pulleys for more testing. I'll get them in a couple of days, but
they're more expensive of course.</div>
<div dir="auto"><br>
</div>
<div dir="auto">I tried using builder's line. It doesn't stretch but I can't get the tension I want. I tried fishing line, but it does stretch, and I found it snarling up on the drive pulley.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Thanks,</div>
<div dir="auto"><br>
</div>
<div dir="auto">Andrew</div>
<div dir="auto"><br>
</div>
</div>
<div class="gmail_extra">
<div class="gmail_quote"><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
</blockquote>
</div>
</div>
</div>
</div></div>
</div>
</div>
</div>
<br>______________________________<wbr>_________________<br>
Chchrobotics mailing list <a href="mailto:Chchrobotics@lists.ourshack.com">Chchrobotics@lists.ourshack.<wbr>com</a><br>
<a href="https://lists.ourshack.com/mailman/listinfo/chchrobotics" rel="noreferrer" target="_blank">https://lists.ourshack.com/<wbr>mailman/listinfo/chchrobotics</a><br>
Mail Archives: <a href="http://lists.ourshack.com/pipermail/chchrobotics/" rel="noreferrer" target="_blank">http://lists.ourshack.com/<wbr>pipermail/chchrobotics/</a><br>
Meetings usually 3rd Monday each month. See <a href="http://kiwibots.org" rel="noreferrer" target="_blank">http://kiwibots.org</a> for venue, directions and dates.<br>
When replying, please edit your Subject line to reflect new subjects.<br></blockquote></div><br></div></div></div>
</blockquote></div></div></div>