tag:blogger.com,1999:blog-364312430122069233.post7578201399871718158..comments2019-08-15T05:29:36.977-05:00Comments on Home brew electronics: matt6ft9http://www.blogger.com/profile/01695046933467325410noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-364312430122069233.post-812381298690572422013-12-15T20:04:08.713-06:002013-12-15T20:04:08.713-06:00You guys are correct about the bowden cables. I s...You guys are correct about the bowden cables. I should have not gone with that.<br />Chuck, good tip about the drilling of long holes.<br />Springs would have been a good idea.matt6ft9https://www.blogger.com/profile/01695046933467325410noreply@blogger.comtag:blogger.com,1999:blog-364312430122069233.post-40126991799563708762013-12-13T15:21:56.452-06:002013-12-13T15:21:56.452-06:00I'm not an engineer, but it seems like maybe y...I'm not an engineer, but it seems like maybe you could make this work if you put springs behind the pixels.<br />Slippy Lanehttps://www.blogger.com/profile/18161705857248077189noreply@blogger.comtag:blogger.com,1999:blog-364312430122069233.post-57098672312120550482013-12-13T14:02:17.540-06:002013-12-13T14:02:17.540-06:00In the aircraft parts business, we have a techniqu...In the aircraft parts business, we have a technique for drilling long holes in tough materials. We first drill, slightly undersized. Drills are designed to clear chips, and to do that they have to have large passages, which makes them flexible. Thus they don't make really straight holes. They also don't make really round holes! Typically holes will be slightly triangular.<br />So then we go down the same holes with an end mill, which is much stiffer, to straighten them and make them round. On really critical holes, we then go in with a reamer to get accurate diameters and improve the surface finish.Chuck Mallochhttps://www.blogger.com/profile/08709845833009606387noreply@blogger.comtag:blogger.com,1999:blog-364312430122069233.post-30517743424717871682013-12-13T08:49:04.414-06:002013-12-13T08:49:04.414-06:00use radio control model airplane flexible pushrods...use radio control model airplane flexible pushrods. They're made for exactly things like thisJohn Shepleyhttps://www.blogger.com/profile/14654248079719542389noreply@blogger.comtag:blogger.com,1999:blog-364312430122069233.post-73199251053940902742013-12-13T03:30:55.981-06:002013-12-13T03:30:55.981-06:00As stated by mattthegamer463, the bowden (bycicle)...As stated by mattthegamer463, the bowden (bycicle) cables you used are supposed to pull only. When you try to push with them, although they look sturdy enough to push the pens, they may jam ocasionally, because you are not pushing them straight, but around the servo's center of rotation. My suggestion:<br />change the horns you used on the servos with symmetrical ones, meaning with the ones that extend to two sides from the gear and connect one cable to one side of the horn to push the pen, and another to pull it back, to the other side of the horn. you may run in to some trouble to fit double the cables you intended to use though.Unknownhttps://www.blogger.com/profile/01649353190507311182noreply@blogger.comtag:blogger.com,1999:blog-364312430122069233.post-41564021977151168762013-12-12T18:14:32.993-06:002013-12-12T18:14:32.993-06:00The problem with cables is they aren't meant t...The problem with cables is they aren't meant to be pushed. The reason they work great for bike brakes is that they are always being pulled, either by the handle or by the spring force that normally keeps the brake calipers open. If you got some firm steel wire and make it into lots of little arms (imagine your servos are an engine crankshaft and your pixels are pistons, and you need piston arms between them)<br /><br />The pegboard idea sounds good. If you want to pay or can get access to one, a laser cutter would produce a few pegboard-like frames you could use and with the great precision required.mattthegamer463https://www.blogger.com/profile/15623167982291517872noreply@blogger.comtag:blogger.com,1999:blog-364312430122069233.post-63454391003428737372013-11-18T15:33:48.380-06:002013-11-18T15:33:48.380-06:00Hey, Matt! So sorry for contacting you here but ju...Hey, Matt! So sorry for contacting you here but just saw your sump pump project and was wondering if you'd be interested in submitting your photo of it for a contest I'm helping run? It's the IEEE Standards Association "I Spy Ethernet" contest. No entry fee, you retain the photo copyright. <br /><br />The contest is being held at this Facebook page: http://www.facebook.com/Ethernet40thAnniversaryIEEESA, but additional information is also available in a press release here: http://bit.ly/ISpyEthernet-IEEESA.MelissaDrozdowskihttps://www.blogger.com/profile/05931766482550272901noreply@blogger.com