tag:blogger.com,1999:blog-4339813531032979196.post3196180842321468906..comments2024-02-28T07:32:59.864+00:00Comments on HydraRaptor: Lead kebabsnopheadhttp://www.blogger.com/profile/12801535866788103677noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-4339813531032979196.post-20586011289099043262009-02-20T15:10:00.000+00:002009-02-20T15:10:00.000+00:00A great read! I'm always looking forward to your p...A great read! I'm always looking forward to your posts.<BR/><BR/>I love the way you just create those parts to do an experiment. It clearly shows how research into robotics and replication can be powered by rapid prototyping. It also shows that you're a pro. :)<BR/><BR/>B.t.w. I'd be interested in HDPE results, too. I love its' springy strength too. It's not too rigid, but you can't break it even if you tried.Erik de Bruijnhttps://www.blogger.com/profile/09433438819279256757noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-8846872740476783712009-02-19T18:27:00.000+00:002009-02-19T18:27:00.000+00:00Thank you I will try drilling the 3mm counter bore...Thank you I will try drilling the 3mm counter bore tonight as the taper on the Wellding tip is 2mm my 0.6 section will be 2mm else the drill will break through.<BR/><BR/>If this is still too much I will have to file the tip down I guess it would be nice to leave it as sold though. I noticed they have 0.8 mm bore tips as well.<BR/><BR/>May be using a 0.8mm tip for the more viscus plastics would be a viable comparmise?<BR/><BR/>Amazed by speed you desiging parts in co-create I know co-create was easier for me than AOI but it takes a while to use. You really demonstrate the Power of RepRapping.Anonymoushttps://www.blogger.com/profile/11790019375326311849noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-60817687531737200902009-02-19T13:51:00.000+00:002009-02-19T13:51:00.000+00:00It worries me that pinch wheel drive was rejected ...It worries me that pinch wheel drive was rejected in the past because it didn't work with PCL but now is being found to work. ABS is very easy to extrude compared to all the other platics I have tried, for diffrent reasons in each case. HDPE is the hardest because it is the most viscous and is also very slippery and somewhat flexible so gripping it is more difficult.<BR/><BR/>I still want to retain the ability to work with all four plastics and try some more as well.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-32525453390979879252009-02-19T13:45:00.000+00:002009-02-19T13:45:00.000+00:00Remember this is HDPE, ABS is a lot easier to extr...Remember this is HDPE, ABS is a lot easier to extrude because it is far less viscous. I will publish some ABS figures soon.<BR/><BR/>I drill as close as I dare, probably between 0.5 and 1mm. My recently gained knowledge of viscosity tells me that flow rate through a pipe is directly proportional to presure, the cube of the bore and inversly proportional to the length and viscosity.<BR/><BR/>So opening out from 0.6mm to 3mm increases the flow by 125, so most of the resistance is in the 0.6mm section that is left and is directly proportional to it length. Obviously if it is too thin it will rupture under the pressure. For HDPE I think I am right in saying it is about 100 bar.<BR/><BR/>I hope to confirm this stuff experimentally with this setup.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-21958787071508556062009-02-19T13:24:00.000+00:002009-02-19T13:24:00.000+00:00Wow.. such a lot of work.. looks like my HD steppe...Wow.. such a lot of work.. looks like my HD stepper is not going to drive ABS then ;-(<BR/><BR/>Ive not counter bored the Welding Tip looking at the experimental Alu drawing as It looked right.<BR/><BR/>What length would you sugest for the 0.6mm part the tip to be?Anonymoushttps://www.blogger.com/profile/11790019375326311849noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-11164805400112157942009-02-19T12:35:00.000+00:002009-02-19T12:35:00.000+00:00Pliers are mostly needed because HDPE is slippery....Pliers are mostly needed because HDPE is slippery. :-)Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-14898490231739789722009-02-19T08:50:00.000+00:002009-02-19T08:50:00.000+00:00I can easily push ABS by hand. HDPE is hard work b...I can easily push ABS by hand. HDPE is hard work but still doable with a pair of pliers.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-63975094189016905092009-02-19T05:19:00.000+00:002009-02-19T05:19:00.000+00:00I've done it by hand.I've done it by hand.Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-48068170983351048192009-02-19T05:08:00.000+00:002009-02-19T05:08:00.000+00:00I have been wondering how much fource it would tak...I have been wondering how much fource it would take, so you could not realistically be able to apply the required force by hand for ABS?Fredshttps://www.blogger.com/profile/08092731901892918338noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-91527984948739273912009-02-19T04:30:00.000+00:002009-02-19T04:30:00.000+00:00"You need some margin so it would be the top end o..."You need some margin so it would be the top end of what a Nema 17 can provide."<BR/><BR/>Put a 1:2 gear pair on it and you should be home and dry.Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-73387220775304626622009-02-19T04:20:00.000+00:002009-02-19T04:20:00.000+00:00What WOULD Reprap do without you. Thank you for t...What WOULD Reprap do without you. Thank you for this. Aside from the 163 outlier, those are pretty good numbers. I don't know about you, but I always get a few outliers like that with I do experimentation like that. :-)Forrest Higgshttps://www.blogger.com/profile/17208965471464716174noreply@blogger.com