tag:blogger.com,1999:blog-4339813531032979196.post4731679946454687352..comments2024-02-28T07:32:59.864+00:00Comments on HydraRaptor: A bit of a contraptionnopheadhttp://www.blogger.com/profile/12801535866788103677noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-4339813531032979196.post-24397113073630010452008-08-13T22:04:00.000+01:002008-08-13T22:04:00.000+01:00thetrevor, The be compatible with the RepRap elec...thetrevor,<BR/> The be compatible with the RepRap electronics they need to have four or six wires and take less than 2A and need no more than 12V.<BR/><BR/>For the z-axis they obviously need enough torque to turn the rods but I don't have a figure for that and you probably don't have a figure for the motor so it's trial and error really.<BR/><BR/>For the z-axis a large step angle an low inductance are advantages for speed.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-15052609026700895242008-08-11T18:54:00.000+01:002008-08-11T18:54:00.000+01:00Nophead,I recycle probably 50-100 printers a month...Nophead,<BR/>I recycle probably 50-100 printers a month, it wouldn't be a problem to get four identical motors. Might take a (short) while to get suitable matches, but it's feasible, certainly. What are the characteristics I should look for if I find myself surrounded by motors ?TheTrevorhttps://www.blogger.com/profile/04059325240676144569noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-65201560856759841722008-08-11T13:15:00.000+01:002008-08-11T13:15:00.000+01:00thetrevor, The motors that I have found in printe...thetrevor,<BR/> The motors that I have found in printers are smaller than the ones I ended up using, but bigger than the tiny ones I tried first. They are probably about right for a z-axis but finding four identical would be the problem as you tend to only get two in a printer and often not the same.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-76045444963338584312008-08-10T14:11:00.000+01:002008-08-10T14:11:00.000+01:00Apologies if this has already been covered, but - ...Apologies if this has already been covered, but - a customer came to me to buy some obsolete computer printers, because he wanted the stepper motors for moving the printhead side-to-side and for the paper advance. Inkjet, laser and dot-matrix (except VERY early models) were apparently suitable, common resolution would be 600 dots-per-inch. Any use ? <BR/>And let me say what a pleasure to follow this project, congrats to everybody concerned !TheTrevorhttps://www.blogger.com/profile/04059325240676144569noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-13684715102819156132008-07-26T06:28:00.000+01:002008-07-26T06:28:00.000+01:00Hi Forrest,Roughly how much would your Chinese sup...Hi Forrest,<BR/><BR/>Roughly how much would your Chinese supplier charge for four tin can steppers powerful enough to turn these rods?Enriquehttps://www.blogger.com/profile/09426013757234244524noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-88428479705825489222008-07-26T05:20:00.000+01:002008-07-26T05:20:00.000+01:00You have to watch out with those smaller rods. Th...You have to watch out with those smaller rods. They're floppier and tend to buckle in vertical orientation under load with anything less than about 1/4 inch diameter. That's the biggest issue I'm having with the linear steppers.<BR/><BR/>Mind, if you were to mount the steppers on the topside rather than the bottom that problem would go away.Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-47191413758472259882008-07-25T18:49:00.000+01:002008-07-25T18:49:00.000+01:00Andy, I can't find a retail source for these. The...Andy,<BR/> I can't find a retail source for these. The nearest I found is RS do one that is unipolar, has no pin through the shaft and no mounting lugs for £12.48, RS are never cheap. So not really an economical success. <BR/><BR/>The smaller motors I tried first are cheap enough but it would mean using smaller threaded rods. Something I may come back to after I get the machine running.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-39725512384310179132008-07-25T14:25:00.000+01:002008-07-25T14:25:00.000+01:00Cool! You got it working with those big tin can s...Cool! You got it working with those big tin can steppers! Congrats! :-DForrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-19891460676726565672008-07-25T02:13:00.000+01:002008-07-25T02:13:00.000+01:00That's awesome! Is it cheaper to go with the four...That's awesome! Is it cheaper to go with the four-motor approach, or at least comparable? Much of my frustration with the RepRap so far has to do with the timing belt and trying to drive the four posts with one stepper motor (not enough torque). I like you idea a lot.Andy D.https://www.blogger.com/profile/16618445790245626648noreply@blogger.com