[Emc-users] Xylotex vs Keling Inc stepper CNC kits
Another series of questions. As a newcomer to CNC world I have a lot of those. Looking at stepper based CNC kits, I eventually separated 2 leaders in my prospective of retrofitting to Sherline Mill - Xylotex 4 axis kit - http://www.xylotex.com/4AxSysKit.htm and Keling Inc 4 axis kit - http://www.kelinginc.net/FourXCNCPackage2.html I'm trying to see if one is better then other. They are very close. In fact stepper motors seem to be the same. Power Supply doesn't make huge difference, though Keling's one has higher amperage on specs. I'm not sure how big is the difference in motor drivers. Keling's ones seem to be more powerful. I think biggest difference is in the level of integration between BOB and drivers. Xylotex has all in one board. Keling instead has BOB and all drivers separated. I believe Keling's approach has advantage of easier repair and replacement of modules. However Xylotex' integrated board could have advantages of all components placed closer together and less prone to possible noise/interference in wires. I would really like to hear about other pros and cons of each kit. Or even about other may be more capable kits. Any opinions would be greatly appreciated. Cheers - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Xylotex vs Keling Inc stepper CNC kits
On Thursday 07 August 2008, Sergey Izvoztchikov wrote: Another series of questions. As a newcomer to CNC world I have a lot of those. Looking at stepper based CNC kits, I eventually separated 2 leaders in my prospective of retrofitting to Sherline Mill - Xylotex 4 axis kit - http://www.xylotex.com/4AxSysKit.htm and Keling Inc 4 axis kit - http://www.kelinginc.net/FourXCNCPackage2.html I'm trying to see if one is better then other. They are very close. In fact stepper motors seem to be the same. Power Supply doesn't make huge difference, though Keling's one has higher amperage on specs. I'm not sure how big is the difference in motor drivers. Keling's ones seem to be more powerful. I think biggest difference is in the level of integration between BOB and drivers. Xylotex has all in one board. Keling instead has BOB and all drivers separated. I believe Keling's approach has advantage of easier repair and replacement of modules. However Xylotex' integrated board could have advantages of all components placed closer together and less prone to possible noise/interference in wires. I would really like to hear about other pros and cons of each kit. Or even about other may be more capable kits. Any opinions would be greatly appreciated. Cheers I personally use the xylotex, but built my own power supply. The kelliginc seems like a more powerful deal until you get to the power supply, the 8.3 amp rating is fine, but the fact that its a switcher bothers me. I tried to use a switcher here, but the motors throw enough currant back into the supply at the supply was doing random shutdowns, not conducive to making good parts at all. At only 24 volts, you have little or no rapids advantage over the xylotex and its 24 volt analog supply which can absorb those reverse currents from the motors much better than the switch mode supply can. If you leave out the supply, how does it compare pricewise with the xylotex, also without the supply, then cobble up a 35 volt supply from the junk box? That would almost be the best deal if you can build the supply yourself. -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Adapt. Enjoy. Survive. -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Who is W.O. Baker, and why is he saying those terrible things about me? - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Following error joint 2
hi folks i'm new to this... new to cnc new to emc2 new to linux since i've almost finished a conversion of a desktop micro mill, i tried some of the example g-code files installed from the bdi. i use brushed dc motors together with whale2 drivers in step/dir mode. so far so good - but sometimes i get a following error joint 2 (which is my z-axis). emc2 does not actually know the position of the axis in that mode (i assume) 'cos it continues anyway even if one of the drivers switches off due to a following error. that's why i want to ask you if you can help me with this nasty error which stops all movements. the error repeats every time when executing the same line in the g-code. thanks for your help andy - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Following error joint 2
When emc shows the following error on joint message for a stepdirection system, that means the system is misconfigured. There are two main causes for this error: Cause 1: Insufficient headroom for acceleration and/or velocity. Emc2 defines velocity and acceleration limits in both the trajectory planner and in the step generator. It's necessary to make the step generator's limits just a bit higher than the trajectory planner's, or you get a following error. If you used stepconf to generate your configuration file, then you have encountered a bug that will be fixed in the next release when you re-run stepconf and regenerate your configuration files. Until then, or if you did not use stepconf to generate your configuration files, simply open up the .ini file in a text editor, find the [AXIS_2] section, and for any line that starts STEPGEN_MAXVEL or STEPGEN_MAXACCEL, increase that number by 10%. If this fixes the problem, then you're done. If not, maybe you have the second cause of following error Cause 2: Your step rate in steps per second is too high There is a top limit to the number of steps per second that emc can produce. This is directly related to the BASE_PERIOD, which is the time in nanoseconds between updates to the parallel port. Unless you have really large step length or step space values, then the maximum number of steps per second is either 10/BASE_PERIOD or 5/BASE_PERIOD, depending whether the doublestep technique is used. (If you used stepconf to generate your configuration file, then your configuration file uses the doublestep technique) If you used stepconf to generate your configuration file, then you have encountered a bug that will be fixed in the next release when you re-run stepconf and regenerate your configuration files. Until then, if you used stepconf, run it again and on the basic machine information page note the value shown for max step rate in Hz. On the Z Axis Configuration page, note the value shown for Pulse rate at max speed. Change the Maximum Velocity until this number is 10% below the max step rate from the earlier page. If you did not use stepconf, then in your inifile find the [AXIS_2]MAX_VELOCITY line and decrease the value until you no longer encounter the error. Or you can do it based on the calculation MAX_VELOCITY = .90 * 5 / SCALE / BASE_PERIOD using the SCALE value from the [AXIS_2] section and the BASE_PERIOD value from the [EMCMOT] section. The other problem you mention is that emc doesn't detect that the servo amp has tripped out due to an error. If your servo drive has a fault or error output suitable for connection to a parall port input pin, you can make emc aware of these errors. For example, if you arrange to have a HIGH logic level on parallel port pin 10 when the Z-axis amplifier is in an error condition and a LOW logic level otherwise, then you can add a line like the following to your .hal file: net Zfault parport.0.pin-10-in = axis.2.amp-fault-in If you generated your configuration file with stepconf, then put this in your 'custom.hal' file. When the fault signal is seen, emc will go to machine off mode. Jeff - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Xylotex vs Keling Inc stepper CNC kits
I use the Xylotex 3-axis kit http://www.xylotex.com/3AxWPS.htm with my small router and I'm satisfied. However, I don't run with very high current -- the motors are rated 2A which is already fairly low but I've found that running them at under 1.5A doesn't actually reduce top speeds but does make the motors run much cooler when the machine is stopped. The xylotex datasheet provides the values required to properly configure emc's step timings (step length, step space, direction setup and hold). The keling datasheet does not. So you'll face some trial and error there. Jeff - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Following error joint 2
On Thu, Aug 07, 2008 at 10:12:06PM +, Andi Frommel wrote: well, i don't think it's that old if i'm not wrong, then it's this one: # MD5 checksums generated by MD5summer (http://www.md5summer.org) # Generated 10.07.2008 13:26:39 d2334dbba7313e9abc8c7c072d2af09c *ubuntu-7.10-desktop-i386.iso Ubuntu is different than BDI. BDI is an older customized linux distribution created before Ubuntu became popular. We now encourage all new users to use Ubuntu 8.04 unless its minimum requirements are too great; in that case, use 6.06 but be aware that it won't receive updates as long as 8.04 will. Jeff - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Teach-in.
where did you find the teach-in function? i have a kind of robot where that would have been wery helpfull to program the moves, i was thinking aboat how i could make that kind of programming possible, and was not aware that someone already has been working with someting like that. Bjørn. :) ti., 29.07.2008 kl. 18.02 -0400, skrev Organic Engines: Hi, Has anyone used teach-in, the jog to gcode function that comes with EMC? I can't find a man page or any info on it. Take Care, Dan - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Following error joint 2
Jeff Epler wrote: Ubuntu is different than BDI. BDI is an older customized linux distribution created before Ubuntu became popular. We now encourage all new users to use Ubuntu 8.04 unless its minimum requirements are too great; in that case, use 6.06 but be aware that it won't receive updates as long as 8.04 will. He is using a recent EMC2 distro. ONLY his TEST G-CODE file came from BDI, and that should work fine. But, it may be asking for more velocity that his ini file max velocity and step pulse resolution allows. Jon - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
