tag:blogger.com,1999:blog-4339813531032979196.post12771537349722149..comments2024-02-28T07:32:59.864+00:00Comments on HydraRaptor: Dinosaur?nopheadhttp://www.blogger.com/profile/12801535866788103677noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-4339813531032979196.post-80210870060515926312012-09-05T23:29:23.163+01:002012-09-05T23:29:23.163+01:00Love the blog.
If you want a thread the whole leng...Love the blog.<br />If you want a thread the whole length of the 'bolt' then you don't actually want a bolt, you want a 'set screw'<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-33864718310179096512009-04-22T09:02:00.000+01:002009-04-22T09:02:00.000+01:00> I had thought of using a very small bearing a...> I had thought of using a very small bearing at the bottom end ,but I must admit I hadn't thought it through to use them at both ends.<br /><br />In my Bits From Bytes 1.0 extruder, the one with the thread crossing the filament slightly diagonally, I've added a very small bearing around the end of the drive screw that I threaded (sharper, more grip). I filed the end of the thread a bit smaller (now in a drill press, using the vice to push the file against the end of the rod). A first it would be retained by a 'retainer washer'. I thought it was an awful way to keep the drive screw from pushing out. Now it is held at all sides with minimal friction. The thread seems to have such a good grip that I can file off the side of my filament when the nozzle is blocked. After solving the block I need to push it through manually.Erik de Bruijnhttps://www.blogger.com/profile/09433438819279256757noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-90504800150021243002009-04-14T23:20:00.000+01:002009-04-14T23:20:00.000+01:00Vik,
I did consider that but thought the anti-cl...Vik,<br /> I did consider that but thought the anti-clockwise torque would unscrew the nuts. But I suppose if I extend the coupler so that it goes over both nuts it will lock them together.<br /><br />I will try that method next time, thanks.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-29612132346995952372009-04-14T01:48:00.000+01:002009-04-14T01:48:00.000+01:00> It is hard work tapping stainless steel
>...> It is hard work tapping stainless steel <br />> though. You need a split die, set to its <br />> biggest diameter to start with, and you <br />> need cutting compound.<br /><br />I would really like some pictures about this "split die", or better a short tutorial or photos of the tapping process. I am asking because (maybe im lame) but I never successed tapping steel. I even bought four different die kit, and I destroyed the steel rod at the end. <br /><br />So Im certainly lacking some knowledge/skills when working with hard materials (steel). I would like to see a walkthrough of the process. I hope it is not much to ask;)<br /><br />KhiralyAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-86917388096489966982009-04-14T00:21:00.000+01:002009-04-14T00:21:00.000+01:00To fix a nut on the end of the SS threaded rod, yo...To fix a nut on the end of the SS threaded rod, you can always lock a couple of nuts off against each other.<br /><br />Vik :v)vik-olliverhttps://www.blogger.com/profile/14574212494833831824noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-22283116230463178022009-04-13T17:42:00.000+01:002009-04-13T17:42:00.000+01:00I had thought of using a very small bearing at the...I had thought of using a very small bearing at the bottom end ,but I must admit I hadn't thought it through to use them at both ends.<BR/><BR/>It would require a lathe and as you say it would increase the frictional loss greatly and also the torque required. That is why I chose this method as it only seems to have advantages over the original design. The rollers do rotate with the shaft so the wear on it should be minimal. Also it starts at 4mm diameter compared to the original 3mm, so more surface area to spread the wear over.<BR/><BR/>The offset drive method allows two proper bearings and needs no lathe work, so that would be preferable if it gives the same grip.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-89499031644975787292009-04-13T17:06:00.000+01:002009-04-13T17:06:00.000+01:00I was wondering if you had though of using a much ...I was wondering if you had though of using a much larger, fine thread bolt? If you had a bolt that was larger in diameter than your bearing, you can just use one bearing on each side. Perhaps something like an M24-1.0 bolt? Or here in the US a 1"-14 bolt. You could us a bolt much smaller but with a M24 you could use skate bearings. <BR/><BR/>You would still have to turn down the ends of the screw to fit the bearings. Or you could drill a 8mm hole threw the M24 bolt(you would only need the section of the M24 bolt to be 20mm long or so...) and attach the M24 bolt onto a 8mm drive shaft for the bearings. <BR/>The downside to this option is that you will loose a little more power to the friction work of the screw against the plastic as the surface speed of the screw against the plastic will be higher with a larger diameter screw.<BR/><BR/>Just an idea.geo01005https://www.blogger.com/profile/05207244129346213313noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-10213778361398596262009-04-13T15:51:00.000+01:002009-04-13T15:51:00.000+01:00Nice work. I don't think the screw drive is dead: ...Nice work. I don't think the screw drive is dead: it seems to provide the best grip, and the more grip/power you have, the more variation you can accept with heaters/insulators/nozzle sizes.<BR/>My current drive is a modified BfB screw thread, so there's a lot of this type out there. Moving from this to a stepper/pinch wheel is a moderate investment: a new stepper driver board and motor, plus a couple of RepRapped parts are required. Improvements to the existing extruder are a lot easier.<BR/><BR/>Nice use of the bearings at the bottom landing. I was looking for something like that at the bottom of my coach bolt.<BR/><BR/>Thanks mate.Anonymoushttps://www.blogger.com/profile/10046079586632841601noreply@blogger.com