On 01/02/2015 12:10 PM, John Kasunich wrote: > > > On Fri, Jan 2, 2015, at 01:03 PM, andy pugh wrote: >> On 2 January 2015 at 17:58, John Kasunich <jmkasun...@fastmail.fm> wrote: >>> Also, I have a simple mechanical question: How is the cutting wire >>> kept tight? Cable bipods don't have any ability to resist tension >>> perpendicular to their plane. >> >> The archetypical version uses a wooden C-frame to tension and weight the >> wire: >> http://www.cnc-hotwire.de >> > > In that case, you only have the errors caused by the controlled point(s) > moving > out-of-plane when the cutting wire is tilted. Small for modest tilts, but > increasing > rapidly with angle. Dan mentioned angles up to 22.5 degrees. > > If one controlled point could be constrained in all three directions, then > the kins > to compute the location of the other controlled point (and all four bipod > cable > lengths) are relatively straightforward. > > re hotwire foam cutter xyuv like wedm stuff our german friend left for the forest and took down most of his videos but heres some info on his implementation i saw videos of the two xy pairs in motion he was magic33de or ??? in the irc ichgoodlive?? he mad a boatload of linuxcnc videos and tutorials https://code.google.com/p/emc2hotwinch/ hth tomp tjtr33
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