The position of D vertically determines the swing in due to the radius shortening as each point gets higher and the center of gravity shifting. The CG is another issue that I haven't brought up yet but yes it is a concern however I think I can solve that mechanically if need be with pivoting counter weights. I just figured 1 step at a time to begin with.
Each builder will build a bow that will have a different CG so my thought was to require that the bow be balanced with counter weights so each machine configuration would be starting at the same point. That would allow us to concern ourselves only with swing-in due to the radius changing. In fact, it may be so small, that by accounting for it by shifting the CG enough, it is possible that it could be dismissed altogether. I believe I have solved the error that occurs as the wire moves toward the end of the table due to how the cable leaves the pulley which means we can have a larger cutting area with a given size table. If we can solve the positioning errors that we are discussing then the cutting area/options increase dramatically and cheaply since it leaves out rails, bearings, threaded rod, timing belts and gears, wire carriers, etc. My gift is in mechanics, not programming!:-( On Wed, Jan 7, 2015 at 11:41 AM, andy pugh <[email protected]> wrote: > On 7 January 2015 at 16:28, poormansairforce H > <[email protected]> wrote: > > I did not connect Virtual D1 and D2 since it was getting confusing. > > Obviously, the virtual position isn't 22.5 degrees. > > I wonder what determines the position of the wire in the Z-direction? > > is the swing-in angle always symmetrical? I suspect not, and that the > centre of gravity of the stretching frame matters. > > The solution would be more deterministic with one end of the wire > constrained to a plane, but that isn't easy to achieve. > > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming! The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is > your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
