CAD CAM EDM DRO - Yahoo Group Archive

Re: Re: Hexapod question

Posted by Ray Henry
on 2003-12-10 22:43:36 UTC
> From: "industrialhobbies" <admin@...>
>
> Although I know nothing about a hexapod design or uses, it would
> appear that in order to maximize effectiveness of the machine it
> would need to be built with the struts on the bottom, so the material
> can be supported on the top and pushed towards a fixed cutter.
>
> In the example sites that were given the hobby uses seem to want to
> mount the cutter on the movable platform facing down, but the
> professionals put the struts on the bottom and either the flight sim
> pod or the robot arm atop.
>
> If you were to look at the pro versions that use a simple Y base, it
> would be much easier to construct than the cage type assembly as
> shown by the hobbyists. A smaller Y can be made to be the moveable
> platform and a table of sorts mounted on that.
>
> Bringing up an arm from the back would provide a mounting point for
> the cutter.
>
> Next Point:
> Someone mentioned measuring the EXACT positions of the mounting
> points to be of paramount concern and difficulty.
>
> I would have to say that it could easily be done using a rotary table
> (or some other angle fixture), a concave mirror, a laser pointer and
> some basic trig. By using the same basic technique that is used to
> test the parabola of a telescope mirror. That test can be easily
> done one night and will easily get the positions of the strut anchor
> points down to the 1/10,000 range. And the cool thing about using
> optical measurement techniques is when we talk mirror error we talk
> millionths of an inch or better (the really good guys talk amstrongs,
> which is the width of an atom), so 1/ 1,000 is a walk in the park.

Seems to me that we're drawing an artificial distinction between hobby
machines and ones that the pros might use. Ingersol, K&T, and Giddings
and Lewis built and sold Stewart platform machines have designed them
with the spindle on the movable platform rather than the work residing
there.

When I visited Till's lab in Stuttgart he had designed and was running a
machine that was about 16 foot tall, had linear motors for the six fixed
length struts, and ran a movable spindle motor rated more than 20 kw.

A Swedish firm was installing a machine there that also used a relative of
the Stewart platform with a 30 kw motor that also moved on the platform.
That machine had at least 8 degrees of freedom of movement.

I also saw a standardized g-code program and a sample part made using it.
That program was written by a group of auto manufacturers that provided
some standard testing of the ability of these kinds of mills.

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