Re: [Emc-users] Keyboard shortcuts - Axis
I'm watching the table. I know the jog is working as if it were the tool but my mind seems to want to think in terms of which way the table moves. Also, the inconsistency between the XY axes and the Z axis often confuses me (i.e. the arrow keys work reversed w.r.t. the table but the page down button brings the Z axis down) and I'm apt to run the tool into the work accidentally. The work I am doing is tiny and so are the distances I'm moving (like 6mm or less most of the time) so, if I accidentally send an axis the wrong way on continuous jog thinking I'm going to send the tool away from the work, I can easily wipe out yet another 0.3mm carbide drill before the axis grinds to a halt! :-( I just think I might get on better if the axes buttons were reversed - I could always change them back if not. I've just been drilling 0.4mm holes in a couple of 1mm ball bearings - now there's a fun occupation!!! and no, I'm not aiming to shoot a Russian spy in the leg with an umbrella gun.. Best wishes, Ian Ian W. Wright Sheffield UK The difference between theory and practice is much smaller in theory than in practice... -- Best wishes, Ian Ian W. Wright Sheffield UK The difference between theory and practice is much smaller in theory than in practice... - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Keyboard shortcuts - Axis
Put this line in the file ~/.axisrc, with no whitespace at the beginning of the line: bind_axis(Right, Left, 0) Create the file ~/.axisrc if it doesn't exist yet. Jeff - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear motors with EMC
What I like about linear motors is the non-contact, low maintenance, no backlash, high speed, and high accuracy. It may be overkill, but I like that. The extra speed may be useful for thin soft materials and reducing slew time when cutting lots of holes. The extra accuracy may be helpful in doing just a little better than typical waterjets. The main problem with waterjets is the water and the fine mist of abrasives that travels into the bellows. Other problem are inaccuracies in the width of the cut (kerf) due to abrasive flow, speed changes, cutting head offset above the material (usually about 1/16 inch), and vibration of the table and part. Add it all up and you are soon wishing for no backlash and infinite accuracy from your motion system just to gain some sanity. Since I don't want a 16ft ballscrew or belt drive system on the long y-axis I am designing, I think a rack and pinion would be my next best option. I don't want to take a chance that this would wear out quickly and start showing backlash. Does anyone know what the difference in price between a high accuracy rack and pinion and a low accuracy linear motor would be (+/-.0005 inches or better)? If I had enough incentive, it wouldn’t be too late to reconsider a cheaper drive system with adequate specs. John -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stuart Stevenson Sent: Saturday, September 29, 2007 10:14 AM To: Emc-users@lists.sourceforge.net Subject: Re: [Emc-users] linear motors with EMC Why would you use liinear motors on a waterjet? The speed and accuracy needed would allow you to use a much less expensive drive system. I ask this to educate myself. I have never used a waterjet. I am sure I don't know and understand the waterjet gotchas. I understand doing it because you want to. thanks Stuart -- --- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.13.33/1036 - Release Date: 9/28/2007 3:40 PM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.13.33/1036 - Release Date: 9/28/2007 3:40 PM - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] waterjets (was: linear motors with EMC)
On Sat, 29 Sep 2007, John Laessig wrote: waterjets etc etc linear motors and so on A major obstacle in the way of using EMC for waterjets is slowing down the cut in the corners to allow the jet to straighten out. Do you have a CAM program of some sort that does this already? - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear motors with EMC
John Laessig wrote: Since I don't want a 16ft ballscrew or belt drive system on the long y-axis I am designing, I think a rack and pinion would be my next best option. Have you priced linear motors lately? They do sell them by the foot, because either the windings or the magnets have to run the full length of the travel. You also need a position feedback device (encoder) that long, and that will also be quite expensive. Also, just because the motor itself, is non-contact, doesn't mean the entire AXIS is non-contact. There still has to be some kind of guideway with rollers of some sort to keep the motor armature from slamming into the magnets. Jon - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear motors with EMC
Hi John, Just a comment on linear glass scales. Acu-rite does make the ENC250 series in the lengths up to 6 m. with a resolution of 5 um. Really on the edge if you want to control to 0.0005. Using a 2.5 um resolution scale would be better. No idea of price but the SENC150 series goes for ~$2500 at 10'. They do need to be very well supported and aligned. I must say that they are nice if you have a truly zero backlash system. I can't imagine that linear motors will be any less expensive by the foot. Protecting the ways will be an interesting project in itself. Good luck on your project. Dave On Sep 29, 2007, at 1:12 PM, John Laessig wrote: What I like about linear motors is the non-contact, low maintenance, no backlash, high speed, and high accuracy. It may be overkill, but I like that. The extra speed may be useful for thin soft materials and reducing slew time when cutting lots of holes. The extra accuracy may be helpful in doing just a little better than typical waterjets. The main problem with waterjets is the water and the fine mist of abrasives that travels into the bellows. Other problem are inaccuracies in the width of the cut (kerf) due to abrasive flow, speed changes, cutting head offset above the material (usually about 1/16 inch), and vibration of the table and part. Add it all up and you are soon wishing for no backlash and infinite accuracy from your motion system just to gain some sanity. Since I don't want a 16ft ballscrew or belt drive system on the long y-axis I am designing, I think a rack and pinion would be my next best option. I don't want to take a chance that this would wear out quickly and start showing backlash. Does anyone know what the difference in price between a high accuracy rack and pinion and a low accuracy linear motor would be (+/-.0005 inches or better)? If I had enough incentive, it wouldn’t be too late to reconsider a cheaper drive system with adequate specs. John -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stuart Stevenson Sent: Saturday, September 29, 2007 10:14 AM To: Emc-users@lists.sourceforge.net Subject: Re: [Emc-users] linear motors with EMC Why would you use liinear motors on a waterjet? The speed and accuracy needed would allow you to use a much less expensive drive system. I ask this to educate myself. I have never used a waterjet. I am sure I don't know and understand the waterjet gotchas. I understand doing it because you want to. thanks Stuart -- --- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.13.33/1036 - Release Date: 9/28/2007 3:40 PM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.13.33/1036 - Release Date: 9/28/2007 3:40 PM -- --- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] front panel pulsecoder
Hi all, Step one is now done; the pulsecoder is connected to channel 03 encoder on the stg board and it works. 400 counts /rev. This would scale nicely to 0.100/rev. I have a nice front panel switch for X, Y, Z ,B. If I use B as a not enable then the other positions select axis and enable at the same time. The pulsecoder itself is bidirectional so I don't need a direction bit. Now I need some help on how to set up a HAL connection for this. Pointing to a relevant example on the wiki would be a good start. At least for now I don't see a need have multiple scales related to a pulse. Dave - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] front panel pulsecoder
You do need multiple scales for pulse coder at .001,.010,.1 for touch off tools or using in manual for milling. Dave Engvall [EMAIL PROTECTED] wrote: Hi all, Step one is now done; the pulsecoder is connected to channel 03 encoder on the stg board and it works. 400 counts /rev. This would scale nicely to 0.100/rev. I have a nice front panel switch for X, Y, Z ,B. If I use B as a not enable then the other positions select axis and enable at the same time. The pulsecoder itself is bidirectional so I don't need a direction bit. Now I need some help on how to set up a HAL connection for this. Pointing to a relevant example on the wiki would be a good start. At least for now I don't see a need have multiple scales related to a pulse. Dave - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear motors with EMC
if i read your request correctly it would involve a 16 foor linear motor and you'd have to be a major government to afford that ;) tomp - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] front panel pulsecoder
Hi Todd, The base movement. 0.001/detent should work but 1/4 that would be better. I can add a couple more bits for scaling; that should do it. Dave On Sep 29, 2007, at 4:47 PM, Todd Bombaci wrote: You do need multiple scales for pulse coder at .001,.010,.1 for touch off tools or using in manual for milling. Dave Engvall [EMAIL PROTECTED] wrote: Hi all, Step one is now done; the pulsecoder is connected to channel 03 encoder on the stg board and it works. 400 counts /rev. This would scale nicely to 0.100/rev. I have a nice front panel switch for X, Y, Z ,B. If I use B as a not enable then the other positions select axis and enable at the same time. The pulsecoder itself is bidirectional so I don't need a direction bit. Now I need some help on how to set up a HAL connection for this. Pointing to a relevant example on the wiki would be a good start. At least for now I don't see a need have multiple scales related to a pulse. Dave -- --- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- --- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] waterjets (was: linear motors with EMC)
I have waterjet specific cam software to handle the feedrate ramping, so that’s not a problem. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of ben lipkowitz Sent: Saturday, September 29, 2007 4:41 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] waterjets (was: linear motors with EMC) On Sat, 29 Sep 2007, John Laessig wrote: waterjets etc etc linear motors and so on A major obstacle in the way of using EMC for waterjets is slowing down the cut in the corners to allow the jet to straighten out. Do you have a CAM program of some sort that does this already? No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.13.33/1036 - Release Date: 9/28/2007 3:40 PM - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
