tag:blogger.com,1999:blog-23681518.post4207452933412338702..comments2023-10-14T04:05:08.546-07:00Comments on Diary of a Technocratic Anarchist: Winding up the String WarsForrest Higgshttp://www.blogger.com/profile/17208965471464716174noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-23681518.post-66395325239683800132011-06-01T00:37:25.716-07:002011-06-01T00:37:25.716-07:00Hi Forrest,
... the critical area is more the bod...Hi Forrest,<br /><br />... the critical area is more the body of the plastic parts - if you tense the wires high enough, the constant force may bend or break the plastic.<br /><br />With my mechanics with solid POM-parts i could measure a significat loss in tension after some months, so i added some stiffening parts to the plastic holders, what too reduced the mechanical oscillation of the optical head ...<br /><br />ViktorViktorhttps://www.blogger.com/profile/15113398481429777999noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-76627170625822982662011-05-31T08:13:25.966-07:002011-05-31T08:13:25.966-07:00@Viktor LOL! I guess it is not readily apparent ...@Viktor LOL! I guess it is not readily apparent just looking at the pictures, but the contact surface between the steel cable and the pulley is a steel 604 bearing. The ABS you see acts only as hubs to keep the cables in alignment. I'm not a complete idiot. :-DForrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-50924802330700996252011-05-31T07:19:27.144-07:002011-05-31T07:19:27.144-07:00Hi Forrest,
... let's see :)
I've built ...Hi Forrest,<br /><br />... let's see :)<br /><br />I've built my first laserplotters around 1990 with 0.3mm or 0.5mm thick steel wires, but my connectors were solid metall or milled from POM, so they were more stable than the wires ;-)<br /><br />ViktorViktorhttps://www.blogger.com/profile/15113398481429777999noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-88278337169907974282011-05-31T05:42:33.026-07:002011-05-31T05:42:33.026-07:00@Victor I've made the tension in the steel ca...@Victor I've made the tension in the steel cable about the same as you'd find in a drafting table's cabled parallel bar which uses the same technology.<br /><br />As to the robustness of the solid ABS parts, it is impossible to say at this point. I have made designed for strength and put the grain of the prints at a 45 degree angle to the force lines in virtually all instances.<br /><br />I think the best test will simply be to run the printer for several thousand hours and see what breaks. :-DForrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-90481289679124213452011-05-31T03:19:52.214-07:002011-05-31T03:19:52.214-07:00Hi Forrest,
how strong is the string tension?
Ca...Hi Forrest,<br /><br />how strong is the string tension?<br /><br />Can the plastic parts handle this over long time without splitting apart?<br /><br />ViktorViktorhttps://www.blogger.com/profile/15113398481429777999noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-23528506318670681192011-05-28T14:29:27.265-07:002011-05-28T14:29:27.265-07:00So far, just a friction gripper. More may be requ...So far, just a friction gripper. More may be required.Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-1427321604104566002011-05-28T13:13:34.311-07:002011-05-28T13:13:34.311-07:00How's the lift connected to the string? Is the...How's the lift connected to the string? Is there a loop or?Bogdan Kecmanhttps://www.blogger.com/profile/01325622305629819241noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-29689526285615003752011-05-26T14:17:43.651-07:002011-05-26T14:17:43.651-07:00The ability to print light duty drive trains is on...The ability to print light duty drive trains is one of 3D printing's big advantages, imo. I'd have had to have that gear pair specially cut at a cost of many hundreds of dollars. As it was, I printed it from a couple of dollars of ABS plastic in about 5-6 hours.Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-82580416090428509892011-05-26T13:58:04.135-07:002011-05-26T13:58:04.135-07:00Nice. Herringbones reduce cogging too. (With you...Nice. Herringbones reduce cogging too. (With your low tooth count you'd get it above and beyond the stepper!)<br />I'm enthusiastic about the possibilities of printed gearing -- there are lots of configurations that are just too complex to use machined gears for (helical conical internal gears, anyone?). Maybe someone will eventually try Drexler's toroidal worm gear...J Storrs Hallhttps://www.blogger.com/profile/12323133053099627122noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-86886375400504530902011-05-24T14:04:15.600-07:002011-05-24T14:04:15.600-07:00No backlash. The weight of the print table keeps ...No backlash. The weight of the print table keeps them permanently engaged in the down direction. As well, the gears are herringbone, which intrinsically have very low backlash.Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-23681518.post-72840333561368071112011-05-24T12:06:12.796-07:002011-05-24T12:06:12.796-07:00Q: what do you use to predict the performance of t...Q: what do you use to predict the performance of this lash-up?<br /><br />A: String Theory.<br /><br />Seriously, what's the backlash on those printed gears?J Storrs Hallhttps://www.blogger.com/profile/12323133053099627122noreply@blogger.com