[CAD_CAM_EDM_DRO] Re: CNC robotic welding arms
Posted by
Mark Ehle
on 2002-05-17 08:56:02 UTC
OOOH! EMC can do that? It has that built in?
Can anybody tell me more?
Mark
instead of a two jointed planar arm, it will not interpolate
correctly.
For instance, if you want to cut a straight line from a position 45
degrees to the left of the base to a position the same distance from
the base but 45 degrees to the right, your G code would command the
base axis to move +90 degrees and the elbow joint zero degrees.
Instead of a straight line you would get an arc whose center point is
the base of the machine.
A way around this is to break things up into very short segments line
a constant-contouring file. A better way is to use a controller that
knows what kind of mechanism it is driving ie feed it XY and let it
do the rectangular to angular conversion itself. I understand that
EMC can do this easily.
- Tom Scarince
Can anybody tell me more?
Mark
>>> thscarince@... 05/17/02 11:38AM >>>If your controller software still thinks its driving an XY machine
instead of a two jointed planar arm, it will not interpolate
correctly.
For instance, if you want to cut a straight line from a position 45
degrees to the left of the base to a position the same distance from
the base but 45 degrees to the right, your G code would command the
base axis to move +90 degrees and the elbow joint zero degrees.
Instead of a straight line you would get an arc whose center point is
the base of the machine.
A way around this is to break things up into very short segments line
a constant-contouring file. A better way is to use a controller that
knows what kind of mechanism it is driving ie feed it XY and let it
do the rectangular to angular conversion itself. I understand that
EMC can do this easily.
- Tom Scarince
--- In CAD_CAM_EDM_DRO@y..., "rainnea" <rab@r...> wrote:
> These would seem in theory to be ideal for plasma or laser cutting.
> Realising that calculating the movement coordinates can be pretty
> straightforwards set me thinking about these robot arms in the
first
> place. Just generate G Code that contains all rotational
coordinates,
> and most any controller would work in the same way that many folks
> use their controller's Y-axis to rotate a rotary table.
> However, how the controller handles the velocity calculations is
> another matter when you start using rotational axes, as the
> controller really needs to know the distance it's moving to
calculate
> the velocity. ie. many controllers have problems with a large
> rotational move combined with a very small linear move.
> Can anyone shed some light as to how high-end controller handle
this
> problem ?
>
Addresses:
FAQ: http://www.ktmarketing.com/faq.html
FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it
if you have trouble.
http://www.metalworking.com/news_servers.html
http://groups.yahoo.com/group/jobshophomeshop I consider this as a
sister site to the CCED group, as many of the same members are there,
for OT subjects, that are not allowed on the CCED list.
Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
Moderator: jmelson@... timg@... [Moderator]
URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
bill,
List Mom
List Owner
Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
Discussion Thread
Shelbyville Design & Signworks
2002-05-15 12:36:25 UTC
Re: [CAD_CAM_EDM_DRO] CNC robotic welding arms
Unterhausen Umberto
2002-05-16 04:52:43 UTC
Re: CNC robotic welding arms
rainnea
2002-05-16 09:39:05 UTC
Re: CNC robotic welding arms
Mark Ehle
2002-05-16 11:18:43 UTC
[CAD_CAM_EDM_DRO] Re: CNC robotic welding arms
rainnea
2002-05-16 21:39:46 UTC
Re: CNC robotic welding arms
ths992001
2002-05-17 08:38:19 UTC
Re: CNC robotic welding arms
Mark Ehle
2002-05-17 08:56:02 UTC
[CAD_CAM_EDM_DRO] Re: CNC robotic welding arms
Jon Elson
2002-05-17 10:19:52 UTC
Re: [CAD_CAM_EDM_DRO] Re: CNC robotic welding arms
Ray Henry
2002-05-17 13:25:59 UTC
Re: Re: CNC robotic welding arms
rainnea
2002-05-18 06:49:55 UTC
Re: CNC robotic welding arms
Sven Peter
2002-05-18 12:19:20 UTC
Re: [CAD_CAM_EDM_DRO] Re: CNC robotic welding arms