CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] degrees of freedom Was: Angle Iron Ways

on 2006-08-20 18:31:38 UTC
Look closer... If you have 'fixed' length struts (I mean really fixed, not
extensible or retractible) the platform cannot move. On a hexapod, at least
two adjacent struts must be extensible to have even one degree of freedom.
four adjacent extensible struts should allow you 3 degrees of freedom, and
all 6 struts movable should give you your 6 degrees of freedom. ...Unless
my observations are greatly in error...

RayHex

-----Original Message-----
From: Dennis Schmitz <denschmitz@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date: Friday, August 18, 2006 9:52 PM
Subject: [CAD_CAM_EDM_DRO] degrees of freedom Was: Angle Iron Ways


>I was reading the description of hand tooling a precision flat and was
>trying to figure out what he meant by "kinematic" since it could be
>lots of different things, and one of my google searches lead here:
>
>http://www.hexel.com/
>http://www.prsco.com/rotopod.html
>
>Call me sheltered, but I've never seen a positioning stage anything
>like this. I've seen these things (which I now know are called
>"stewart platforms" or "hexapods") in optics labs, but never on a
>machine tool. But then again that shouldn't be too surprising because
>I design high performance processors and systems for in my day job
>rather than CNC machines.
>
>What's neat about this one is that there aren't any hydraulic
>cylinders or otherwise complicated mechanical strut actuators, but
>simple fixed length struts. And what look to be very expensive ball
>joint bearings, but I don't think they're really necessary.
>
>Then I looked around some more and found this router. It looks like a
>giant robotic spider took over his shop, but in a cool way. The lead
>screws are enormous.
>
>http://www.foxkid.net/cmm/platform/project-notebook.html
>
>You obviously don't need REALLY need a 6-deg freedom system for a
>router, but it might come in handy if you needed to carve a couple
>dozen wooden indians or something.
<snip>

Discussion Thread

Dennis Schmitz 2006-08-18 21:52:10 UTC degrees of freedom Was: Angle Iron Ways Dennis Schmitz 2006-08-18 22:02:54 UTC Re: degrees of freedom Was: Angle Iron Ways Graham Stabler 2006-08-19 13:54:26 UTC Re: degrees of freedom Was: Angle Iron Ways Graham Stabler 2006-08-19 14:06:13 UTC Re: degrees of freedom Was: Angle Iron Ways leslie watts 2006-08-20 03:15:21 UTC RE: [CAD_CAM_EDM_DRO] Re: degrees of freedom Was: Angle Iron Ways Dennis Schmitz 2006-08-20 13:24:48 UTC Re: [CAD_CAM_EDM_DRO] Re: degrees of freedom Was: Angle Iron Ways Raymond Heckert 2006-08-20 18:31:38 UTC Re: [CAD_CAM_EDM_DRO] degrees of freedom Was: Angle Iron Ways Stephen Wille Padnos 2006-08-20 19:12:57 UTC Re: [CAD_CAM_EDM_DRO] degrees of freedom Was: Angle Iron Ways Dennis Schmitz 2006-08-20 20:30:53 UTC Re: [CAD_CAM_EDM_DRO] degrees of freedom Was: Angle Iron Ways Graham Stabler 2006-08-21 02:41:41 UTC Re: degrees of freedom Was: Angle Iron Ways Graham Stabler 2006-08-21 02:42:08 UTC Re: degrees of freedom Was: Angle Iron Ways Alan Marconett 2006-08-21 08:02:25 UTC RE: [CAD_CAM_EDM_DRO] degrees of freedom Was: Angle Iron Ways Stephen Wille Padnos 2006-08-21 08:15:49 UTC Re: [CAD_CAM_EDM_DRO] Re: degrees of freedom Was: Angle Iron Ways turbulatordude 2006-08-21 09:09:36 UTC Re: degrees of freedom - Hexapod Graham Stabler 2006-08-21 11:37:52 UTC Re: degrees of freedom - Hexapod Dennis Schmitz 2006-08-21 18:38:59 UTC Re: [CAD_CAM_EDM_DRO] Re: degrees of freedom Was: Angle Iron Ways Raymond Heckert 2006-08-22 22:20:27 UTC Re: [CAD_CAM_EDM_DRO] Re: degrees of freedom Was: Angle Iron Ways Graham Stabler 2006-08-23 04:05:03 UTC Re: degrees of freedom Was: Angle Iron Ways Raymond Heckert 2006-08-23 07:24:49 UTC Re: [CAD_CAM_EDM_DRO] degrees of freedom Was: Angle Iron Ways Graham Stabler 2006-08-23 11:43:57 UTC Re: degrees of freedom Was: Angle Iron Ways