tag:blogger.com,1999:blog-4339813531032979196.post2707576844978343686..comments2024-02-28T07:32:59.864+00:00Comments on HydraRaptor: Sticking pointnopheadhttp://www.blogger.com/profile/12801535866788103677noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-4339813531032979196.post-32904038487782193052008-12-22T14:34:00.000+00:002008-12-22T14:34:00.000+00:00I got it from Farnell for about £16.It isn't the s...I got it from <A HREF="http://uk.farnell.com/jsp/search/browse.jsp?N=2823+500006+1003384" REL="nofollow">Farnell</A> for about £16.<BR/><BR/>It isn't the same make as Metalab uses so I don't know if it works yet.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-78055451253677750392008-12-22T14:10:00.000+00:002008-12-22T14:10:00.000+00:00Hi, yes PEEK looks like it will work well, MetaLab...Hi, yes PEEK looks like it will work well, MetaLab guys are doing good work.<BR/><BR/>I looked at getting some but was scared away by the price. where did you get yours?Davehttps://www.blogger.com/profile/11987514110079695313noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-40458035042147890062008-12-21T21:52:00.000+00:002008-12-21T21:52:00.000+00:00Interesting, one of things I have been meaning to ...Interesting, one of things I have been meaning to try was to simply shorten the stainless steel pipe in my high temp design. Looks like it would work but wastes a fair bit of energy. I was only losing about 1.4W with 50mm so if I reduced it to 12mm I would lose 5.8W which is about 50% of the heater power required. Still not much compared to the total power to run the machine.<BR/><BR/>I am making a PEEK insulator at the moment as the MetaLab guys report good results with it. It is a lot stronger than PTFE. Quite nice to machine.nopheadhttps://www.blogger.com/profile/12801535866788103677noreply@blogger.comtag:blogger.com,1999:blog-4339813531032979196.post-62167223742392944882008-12-21T21:07:00.000+00:002008-12-21T21:07:00.000+00:00Hi, Nop:Right after I got into RR work, I reviewed...Hi, Nop:<BR/><BR/>Right after I got into RR work, I reviewed most of the patents available from stratasys.<BR/><BR/>They of course solved the thermal gradient problem as well. They did it by doing two things:<BR/><BR/>(1) they use smaller diameter filament, and<BR/><BR/>(2) they use cooling air flow to allow cool filament to enter a hot nozzle. In the strat machines, it appears that there is about 1/2" of stainless steel thin-wall tubing exposed to cooling air, and the thermal gradient from 270C to ambient is accomlished in that small length. The strat machines use a thin walled tube that is bolted into an alum. block.<BR/><BR/>I do not know to what extent the diameter of the filament contributes to the fact that their design works. In my extruder, I'm currently still using PTFE, but designed it with the extruder barrel assembly not mechanically connected via the PTFE so that later I could experiment with cooling air instead of the PTFE piece. <BR/><BR/>At a minimum i've managed to remove the PTFE from being a structural member, which seems to help.Davehttps://www.blogger.com/profile/11987514110079695313noreply@blogger.com