Re: [Emc-users] MAXNC Open Loop Mill
2009/10/7 Kirk Wallace kwall...@wallacecompany.com I use EMC2 quadrature output on my Shizuoka mill: http://www.wallacecompany.com/machine_shop/Shizuoka/ which is used to drive the steppers in half-step mode. Basically, there is just an amplifier between EMC2 and the stepper. If you ever find an odd function in EMC2, you can be sure Kirk uses it. :) Kirk, what are the optointerrupters for? --S -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] MAXNC Open Loop Mill
2009/10/7 Kirk Wallace kwall...@wallacecompany.com: I use EMC2 quadrature output on my Shizuoka mill: http://www.wallacecompany.com/machine_shop/Shizuoka/ which is used to drive the steppers in half-step mode. I assume this is what they are doing in the MAXNC mills, they have probably offloaded the step generation to the PC software. On the hardware side is it as simple as running phase A positive polarity when the A channel is high and negative polarity when low, and the same for B? (Not that that matters for Wayne's purposes, of course.) -- atp -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Does EMC save coordinations on program shutdown?
Hello Guys, I have question about coordination. When I start EMC it always has HOME coordinations, does not matter if I finished at home or at another place. Does exists any way to save coordinations and start emc with saved coordinations? Best Regards Evgney -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] MAXNC Open Loop Mill
On Wed, 2009-10-07 at 09:43 +0200, Sven Wesley wrote: 2009/10/7 Kirk Wallace kwall...@wallacecompany.com I use EMC2 quadrature output on my Shizuoka mill: http://www.wallacecompany.com/machine_shop/Shizuoka/ which is used to drive the steppers in half-step mode. Basically, there is just an amplifier between EMC2 and the stepper. If you ever find an odd function in EMC2, you can be sure Kirk uses it. :) Kirk, what are the optointerrupters for? --S If you mean here: http://www.wallacecompany.com/machine_shop/Shizuoka/Shizuoka_Step_Drv-1a.png (Short URL) http://preview.alturl.com/fmdb these are on the original stepper drivers. On the PC side, I have a 74ls244: http://focus.ti.com/lit/ds/symlink/sn74ls241.pdf that provides enough power to drive the LED in the opto-interrupter (/coupler). I like to have an opto-coupler somewhere in the connection between the PC and the outside world to help prevent damaging the PC. Early on, I blew out a motherboard parallel port, which bothers me to no end. Now, I try to use cheap PCI parallel port cards and opto-couplers, so I don't make the same mistake again. Plus, the couplers come in handy for voltage conversion. My guess is, one volt of noise on a 12 volt signal is less of a problem than on a three or five volt signal, the coupler makes it easy to convert the machine signal voltage to what the parallel port needs. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] MAXNC Open Loop Mill
2009/10/7 Kirk Wallace kwall...@wallacecompany.com On Wed, 2009-10-07 at 09:43 +0200, Sven Wesley wrote: 2009/10/7 Kirk Wallace kwall...@wallacecompany.com If you ever find an odd function in EMC2, you can be sure Kirk uses it. :) Kirk, what are the optointerrupters for? --S If you mean here: http://www.wallacecompany.com/machine_shop/Shizuoka/Shizuoka_Step_Drv-1a.png (Short URL) http://preview.alturl.com/fmdb these are on the original stepper drivers. On the PC side, I have a 74ls244: http://focus.ti.com/lit/ds/symlink/sn74ls241.pdf that provides enough power to drive the LED in the opto-interrupter (/coupler). It's an odd combination of this image: http://www.wallacecompany.com/machine_shop/Shizuoka/mpg_proto-1a.jpg http://www.wallacecompany.com/machine_shop/Shizuoka/mpg_proto-1a.jpgand the text The PDF for the opto-interupters is here (H22L)http://www.fairchildsemi.com/ds/H2/H22LOB.pdf., and I didn't really understand the combination. But opto couplers are nice, absolutely. If I understood your setup, You only have the EMC2 output signal, opto couplers, amplifiers and then the motors? Sounds like a really clean setup to me. How fast can you go? Regards, Sven -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Does EMC save coordinations on program shutdown?
??? ? wrote: Hello Guys, I have question about coordination. When I start EMC it always has HOME coordinations, does not matter if I finished at home or at another place. Does exists any way to save coordinations and start emc with saved coordinations? EMC saves the OFFSET between home and the various work coordinates you have set. So, if your machine is able to home to a repeatable position, then all work coordinate systems (G54, G55, etc.) will be relative to the same position on the machine. So, a fixture that is bolted to the table, the corner of the fixed vise jaw or whatever can be brought back. Without a repeatable home position, this is not of any value. Jon -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] MAXNC Open Loop Mill
On Wed, 2009-10-07 at 18:52 +0200, Sven Wesley wrote: ... snip It's an odd combination of this image: http://www.wallacecompany.com/machine_shop/Shizuoka/mpg_proto-1a.jpg http://www.wallacecompany.com/machine_shop/Shizuoka/mpg_proto-1a.jpgand the text The PDF for the opto-interupters is here (H22L)http://www.fairchildsemi.com/ds/H2/H22LOB.pdf., and I didn't really understand the combination. But opto couplers are nice, absolutely. If I understood your setup, You only have the EMC2 output signal, opto couplers, amplifiers and then the motors? Sounds like a really clean setup to me. How fast can you go? Regards, Sven This picture: http://www.wallacecompany.com/machine_shop/Shizuoka/mpg_proto-1a.jpg shows my experiment at making a cheap jog wheel (or MPG). I failed to notice that you mentioned opto-interrupters as opposed to opto-couplers, which until now, I tended to use the terms to mean the same thing. Sometimes it takes a 2x4 to the head to make me realize the obvious. I can rapid up to 70 inches per minute, so... 70/min. 5 rev./1 200 steps/rev. 1 min/60 sec. = 1166 steps/sec. I got this maximum speed by running the axis until I started losing steps, then backed off a bit. The parallel port signals should be able to go much faster. The signals between the original Bandit controller and the stepper driver boards were quadrature, so I just copied what the Bandit was doing, except the Bandit had a clever means to phase in single stepping at higher step rates (50 ipm). This gave a maximum axis travel rate of 100 per minute. I want to go to servos and 70 per minute is fine for now, so I haven't tried to figure out how to get EMC2 to to phase in single stepping. So basically, there is just a driver chip and some CAT5 between EMC2 and the original driver board and stepper motor. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] UK EMC Users Meetup
Hi all any body interested in the UK meet up a number of us will be attending on Friday 16th for all thoes interested a meet place time is yet to be agreed robert -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] UK EMC Users Meetup
On Wed, 07 Oct 2009 19:32:21 +0100, you wrote: any body interested in the UK meet up a number of us will be attending on Friday 16th for all thoes interested Saturday maybe but certainly not on Friday, I've work to do and a 250 mile round trip on the M6 in Friday traffic is not high on my list of enjoyable days out - took 2 hours to do 5 miles yesterday, road works AGAIN Steve Blackmore -- -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] UK EMC Users Meetup
I would really like to come but its just too far and on the wrong day.. but I would like to know what happens. Aaron in Cornwall - Original Message - From: Steve Blackmore To: Enhanced Machine Controller \(EMC\) Subject: Re: [Emc-users] UK EMC Users Meetup Date: Wed, 07 Oct 2009 20:37:53 +0100 On Wed, 07 Oct 2009 19:32:21 +0100, you wrote: any body interested in the UK meet up a number of us will be attending on Friday 16th for all thoes interested Saturday maybe but certainly not on Friday, I've work to do and a 250 mile round trip on the M6 in Friday traffic is not high on my list of enjoyable days out - took 2 hours to do 5 miles yesterday, road works AGAIN Steve Blackmore -- -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- An Excellent Credit Score is 750 See Yours in Just 2 Easy Steps! -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Amp Enable Wiring logic.
Seeing as how we have at least a few people here who really understand pull-ups etc (and I am not one of them) I did have everything working fine, but then I blew some drivers meddling with things, and when I replaced them I took the opportunity to get a bigger driver for the X/Z axis (what it calls itself depends on whether it is a lathe or mill config file loaded.) Previously I had the amp-enable lines all connected to the same parallel port pin and it worked fine, logic positive. Pin goes high, amp turns o. This was when all the drivers were this type. http://www.motioncontrolproducts.co.uk/pdf/MSD325_stepper_drive_datasheetV2.0.pdf Now I have added one of these drives, but I can't get it to work the same way (I daisychained all the +5 lines together externally) http://www.motioncontrolproducts.co.uk/pdf/MSD542-V2.0_stepper_drive_datasheet.pdf Ideally I would like the amps disabled if the PC is off, and only actually enabled if EMC is running and active. As far as I can see it all should be logic-negative as I had it wired, but it would seem odd to require a current through the opto-isolators to turn the drives off. That does seem to be what the 325 datasheet says, though (The 525 datasheet seems to be complete gibberish) It is no trouble to change parallel port pins if a particular one has useful boot-up behaviour, nor am I at all concerned about having to use negative logic. (I just didn't know enough about source/sink capacity of parallel ports when I built the system in the first place. I currently have +5V from a PSU connected to the three OPTO terminals. I think I have the p-port ground pins connected to the 0V of the same CPU, but on reflection I am not totally sure... I think I might have a half-witted arrangement where p-port ground is not connected to 5V ground, but the 0V lines of all the PSUs (Independent 5V, 12V and 30V ones) are common. What I possibly should have is the 5V ground connected to the P-Port ground (it only actually drives opto-isolators and reflective opto limit switches and could almost certainly float independently) and the other PSU grounds connected to chassis ground. Currently I can't turn off the MSD542 and one of the MSD325 drivers keeps randomly dis-enabling, so I need to do something slightly cleverer. I would have liked to have linked the enable optos in series to reduce the p-port load, but I don't think that is possible with the internal resistors and the internally-commoned +V on the 325 optos. -- atp -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Amp Enable Wiring logic.
On Thu, 2009-10-08 at 00:27 +0100, Andy Pugh wrote: Seeing as how we have at least a few people here who really understand pull-ups etc (and I am not one of them) I did have everything working fine, but then I blew some drivers meddling with things, and when I replaced them I took the opportunity to get a bigger driver for the X/Z axis (what it calls itself depends on whether it is a lathe or mill config file loaded.) Previously I had the amp-enable lines all connected to the same parallel port pin and it worked fine, logic positive. Pin goes high, amp turns o. This was when all the drivers were this type. http://www.motioncontrolproducts.co.uk/pdf/MSD325_stepper_drive_datasheetV2.0.pdf That seems risky to me because generally the LED in the opto-coupler needs 10 to 20 milliamps to turn on well enough to switch the coupler's output. You have three LED's to sink current for, which is 30 to 60 mA. Generally, a parallel port pin is designed to sink or source about 3mA (some can do much more, but which ones?). I would prefer to see the parallel port pin connected to three inputs of a driver chip like a 74LS244. Each of the three outputs of the 74LS244 could be connected to an opto-coupler input. You can also put a regular LED in series with each opto-coupler input, to get a visual indication of the input's state. If the LED doesn't light up or is dim, you most likely have a problem. Now I have added one of these drives, but I can't get it to work the same way (I daisychained all the +5 lines together externally) http://www.motioncontrolproducts.co.uk/pdf/MSD542-V2.0_stepper_drive_datasheet.pdf Ideally I would like the amps disabled if the PC is off, and only actually enabled if EMC is running and active. If you don't mind modifying your stepper drivers, you could cut the 5 Volt OPTO traces going to each opto-coupler and have the 74LS244 source the LED instead of sink. Also you could use a twisted pair (CAT5) with one wire from the 74LS244 output to the LED + side, then the other wire go from the - side back to the 74LS244 ground. As far as I can see it all should be logic-negative as I had it wired, but it would seem odd to require a current through the opto-isolators to turn the drives off. That does seem to be what the 325 datasheet says, though (The 525 datasheet seems to be complete gibberish) That's because of the sink arrangement. When the EMC2 output is High, both sides of the opto-coupler LED are high, so there no current will go through the LED. Generally you need around .6 Volts across the LED and between 10 to 20 milliamps for normal operation. When the EMC output is Low, the minus side of the LED is zero volts (sinking to ground), the LED + side is around .6 Volts and the + side of the 270 Ohm current limit resistor is 5 Volts. It is no trouble to change parallel port pins if a particular one has useful boot-up behaviour, nor am I at all concerned about having to use negative logic. (I just didn't know enough about source/sink capacity of parallel ports when I built the system in the first place. I currently have +5V from a PSU connected to the three OPTO terminals. I think I have the p-port ground pins connected to the 0V of the same CPU, but on reflection I am not totally sure... I think I might have a half-witted arrangement where p-port ground is not connected to 5V ground, but the 0V lines of all the PSUs (Independent 5V, 12V and 30V ones) are common. What I possibly should have is the 5V ground connected to the P-Port ground (it only actually drives opto-isolators and reflective opto limit switches and could almost certainly float independently) and the other PSU grounds connected to chassis ground. The circuit has to be closed for the opto-couplers to work. The 5 Volt OPTO supply will put 5 Volts on the opto input, the parallel port will try to sink this to the PC's ground, which will need to sink it to the 5 Volt OPTO supply's ground. Currently I can't turn off the MSD542 and one of the MSD325 drivers keeps randomly dis-enabling, so I need to do something slightly cleverer. If you go over more than 3 mA on the parallel port, 50 mA on a driver chip, or 30 mA on a opto-coupler input, you may blow the device out. A parallel port is really hard to fix, a driver chip or opto-coupler is cheep to replace. I would have liked to have linked the enable optos in series to reduce the p-port load, but I don't think that is possible with the internal resistors and the internally-commoned +V on the 325 optos. -- atp You can get more of what you want if you can modify the stepper driver inputs. Maybe they provided jumpers to allow you to do this. You will need to understand how LED's, driver chips, current limit resistors and grounds work together, but it's not rocket science if you take your time, draw out the circuits and ask questions. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/
