tag:blogger.com,1999:blog-4339813531032979196.post9051421242006211553..comments2024-02-28T07:32:59.864+00:00Comments on HydraRaptor: Pulling powernopheadhttp://www.blogger.com/profile/12801535866788103677noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-4339813531032979196.post-30254173559269850422012-05-24T06:18:32.036+01:002012-05-24T06:18:32.036+01:00Thanks, was very helpful to see a comparison and h...Thanks, was very helpful to see a comparison and here about your experience. I think I will go try a screw drive extruder with ball bearings on the thread and to pressure the filament.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-52473969550648634612009-03-27T14:52:00.000+00:002009-03-27T14:52:00.000+00:00I understand if you can RepRap something to just d...I understand if you can RepRap something to just do it. <BR/><BR/>It's been frustrating getting my extuder going and I was thinking of maybe a boot strap design where a few small volume reprap pieces that are easy to mail to someone could get them over the hump.Fredshttps://www.blogger.com/profile/08092731901892918338noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-24890798583539961412009-03-24T16:44:00.000+00:002009-03-24T16:44:00.000+00:00Hi Freds, I have a metal worm drive that mates wi...Hi Freds,<BR/> I have a metal worm drive that mates with the gear. My aim is to find a gear ratio that allows a smaller motor to be used. I worked out that the mechanical power to drive the filament is only 22mW! If I can find an efficient drive method that would only need a tiny motor. Unfortunately nearly all the mechinical effort is wasted in the drive mechanism and a stepper running at very low speed is very inefficient. They need to run at about half their maximum speed for best efficiency.<BR/><BR/>I prefer to not use any fabricated parts if I can help it. Rather than cut a piece of Delrin and drill it, I will just RepRap a motor mount.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-56446653318183567572009-03-24T16:12:00.000+00:002009-03-24T16:12:00.000+00:00I like your design of the feeder with the square t...I like your design of the feeder with the square tooth timing pulley and gear. <BR/><BR/>I image it as being simply bolted to a vertical piece of Delrin, wood or acrylic and the back side has a NEAM 17 or 23 Stepper motor mated somewhere on the circumference of the gear. <BR/><BR/>Maybe it has a four to one or greater ratio as it’s no big thing for the stepper motor to step 20 times a second verse four to six. <BR/><BR/>I also kind of worry about the side loads we are putting on to the motor shafts with these pinch wheel designs.<BR/><BR/>It also looks like you were able to build the test rig fairly rapidly? <BR/><BR/>Maybe we should focus on standard dimensional material with reprap’ed bits of complex shaped parts to be mounted.Fredshttps://www.blogger.com/profile/08092731901892918338noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-49049753626975842562009-03-22T20:45:00.000+00:002009-03-22T20:45:00.000+00:00This is a brilliantly thought out and executed pie...This is a brilliantly thought out and executed piece of work, Chris! <BR/><BR/>Thanks you for doing this heavy lifting.Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-72503863086189084332009-03-22T00:34:00.000+00:002009-03-22T00:34:00.000+00:00Yes a bigger pulley will give more grip, but it re...Yes a bigger pulley will give more grip, but it requires more torque and less speed so probably more gearing.<BR/><BR/>I don't want to bend the filament around the wheel because I would like to be able to extrude materials that might not bend, for example acrylic rod.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-47647464261941627082009-03-21T11:13:00.000+00:002009-03-21T11:13:00.000+00:00A problem may be that only one or two teeth are us...A problem may be that only one or two teeth are used due to the small diameter of the wheel. If you change the orientation of the axis you may be able to use a larger wheel where more teeth are in contact with the fibre. Or you could guide the fibre around a part of the circumference of the wheel so that more teeth are in contact. Here you would have the same problem of friction as in the old extruder.<BR/><BR/>KlausAnonymousnoreply@blogger.com