CAD CAM EDM DRO - Yahoo Group Archive

Re: Re: Hexapod question

Posted by Ray Henry
on 2003-12-13 06:56:21 UTC
> From: "ballendo" <ballendo@...>
>
> Ray,
>
> That is the only one that is going to be accurate without
> compensation. As Mikkelson's machine shows, you can do without ball
> ends. BUT every fullsize realworld machining oriented hexapod I've
> ever seen or heard about uses ballends. (I don't know the details of
> Till F's full size mill.)

Till uses fixed length struts that ride on vertical linear motors. His
geometry is constantly changing as the motor ends of the strut slide.
While the kinematics equasions are slightly different, changing angle,
same length, the principal of passing a world coordinate in x,y,z through
some set of equasions is the same. So long as the equasion used matches
the nature of the physical geometry, the translation will be accurate.
With some Stewart geometries this may be quite a trick.

When I was there, Till was refining the constants in his kinematic
equasions by drilling a set of holes at fixed distances over a surface
and then measuring actual position with a CMM.

Ray

Discussion Thread

Simon M. Arthur 2003-12-09 06:56:50 UTC Hexapod question Jon Elson 2003-12-09 09:40:28 UTC Re: [CAD_CAM_EDM_DRO] Hexapod question Graham Stabler 2003-12-09 11:37:45 UTC Re: Hexapod question Graham Stabler 2003-12-09 11:45:25 UTC Re: Hexapod question Kevin Martin 2003-12-09 13:23:54 UTC RE: [CAD_CAM_EDM_DRO] Hexapod question Simon M. Arthur 2003-12-09 21:55:33 UTC Re: Hexapod question Simon M. Arthur 2003-12-09 21:55:34 UTC Re: Hexapod question Graham Stabler 2003-12-10 05:07:25 UTC Re: Hexapod question Ray Henry 2003-12-10 05:43:54 UTC Re: Hexapod question Asim Khan 2003-12-10 06:32:58 UTC EMC related Question G54 G55,... and use of 5241, 5242, 5243 variables [asimtec] Tim 2003-12-10 08:38:43 UTC Re: Hexapod question Madhu Annapragada 2003-12-10 09:13:24 UTC RE: [CAD_CAM_EDM_DRO] Re: Hexapod question Mariss Freimanis 2003-12-10 10:03:33 UTC Re: Hexapod question Carl Mikkelsen 2003-12-10 10:38:13 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Jon Elson 2003-12-10 10:59:20 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Chuck Knight 2003-12-10 11:00:07 UTC Re: [CAD_CAM_EDM_DRO] Hexapod question Jon Elson 2003-12-10 11:03:17 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Chuck Knight 2003-12-10 11:47:04 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Carl Mikkelsen 2003-12-10 13:10:45 UTC Re: [CAD_CAM_EDM_DRO] Hexapod question industrialhobbies 2003-12-10 14:08:30 UTC Re: Hexapod question Jon Elson 2003-12-10 14:59:06 UTC Re: [CAD_CAM_EDM_DRO] EMC related Question G54 G55,... and use of 5241, 5242, 5243 variables [asimtec] Graham Stabler 2003-12-10 15:31:11 UTC Re: Hexapod question Simon M. Arthur 2003-12-10 15:34:45 UTC Re: Hexapod question Paul 2003-12-10 16:42:46 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Richard L. Wurdack 2003-12-10 17:27:51 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Harvey White 2003-12-10 18:45:58 UTC Re: [cad-cam] [CAD_CAM_EDM_DRO] Re: Hexapod question Simon M. Arthur 2003-12-10 19:07:39 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Ray Henry 2003-12-10 22:43:36 UTC Re: Re: Hexapod question Jon Elson 2003-12-11 03:55:25 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Ray Henry 2003-12-11 06:52:18 UTC Re: Re: Re: Hexapod question alex 2003-12-11 07:32:39 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Hexapod question ballendo 2003-12-11 11:48:35 UTC Re: Hexapod question Jon Elson 2003-12-11 14:43:33 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Hexapod question Kevin Martin 2003-12-11 16:18:35 UTC RE: [CAD_CAM_EDM_DRO] Re: Hexapod question afaIII 2003-12-11 18:12:22 UTC Re: Hexapod question (joints) alex 2003-12-11 18:37:32 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Hexapod question Graham Stabler 2003-12-11 19:11:43 UTC Re: Hexapod question Raymond Heckert 2003-12-11 20:46:06 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question industrialhobbies 2003-12-11 21:09:05 UTC Re: Hexapod question (joints) Don Rogers 2003-12-11 23:11:54 UTC Re: Hexapod question Graham Stabler 2003-12-12 02:29:01 UTC Re: Hexapod question Indy123456 2003-12-12 05:18:32 UTC Re: Hexapod question ballendo 2003-12-12 06:41:38 UTC Re: Hexapod question ballendo 2003-12-12 06:42:22 UTC Re: Hexapod question ballendo 2003-12-12 06:42:31 UTC Re: Hexapod question ballendo 2003-12-12 06:42:55 UTC Re: Hexapod question ballendo 2003-12-12 06:42:56 UTC Re: Hexapod question afaIII 2003-12-12 07:31:08 UTC Re: Hexapod question Raymond Heckert 2003-12-12 18:07:07 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Ray Henry 2003-12-13 06:56:21 UTC Re: Re: Hexapod question cadcracker@l... 2003-12-13 12:49:33 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question Dave Dillabough 2003-12-15 13:24:20 UTC Re: [CAD_CAM_EDM_DRO] Re: Hexapod question doug98105 2003-12-15 16:23:07 UTC Re: Hexapod question