Re: [Emc-users] EDM Pete G
On 04.03.13 19:44, TJoseph Powderly wrote: At the time I got your email, I was writing oneshots for arduino, triggered by the beginning of current flow, an OnTimeShot runs, then a single OffTimeShot. This makes each tiny crater a uniform size, where a constant on/off/on/off will vary in diameter. Is that diameter variation with depth, and if it's due to constant mark/space ratio, are you adjusting the timing ratio of the one-shots to achieve compensation? Erik -- If you understand what you're doing, you're not learning anything. - A. L. -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] EDM Pete G
On 03/05/2013 02:48 AM, Erik Christiansen wrote: Is that diameter variation with depth, and if it's due to constant mark/space ratio, are you adjusting the timing ratio of the one-shots to achieve compensation? Erik, hello, Basically, yes :) The depth and diameter is governed by the joules expended per discharge, A fixed on time does not account for the pulse to pulse variation in ionization time ( how long it takes current flow to begin after voltage is applied). So I do not decrement the desired on time value until the current begins to flow. This makes the joules per discharge equal, and in turn, makes the craters equal. Instead of a repetitive pulser or PWM, I use one shots triggered by a detector. Tomp tjtr33 -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] EDM Pete G
Jeez tomp, that thing got a flux capacitor in it yet? Hell I'd just piss on the spark plug if I thought it would do any goodLOL that is some deep stuff you are playing with man glad and amazed that you are able to do it with linuxcnc. Keep on Merlin's on that is some very interesting work. Always liked EDM machines I have a neighbor who owns a shop with three or four wire EDM's and he does some cool stuff with those I think they were Mitsubishi models. They basically run night and day when he has work for them. None are retrofitted tho but he does have an index mill running on mach3 believe it or not...peace Pete On Tuesday, March 5, 2013, TJoseph Powderly tjt...@gmail.com wrote: On 03/05/2013 02:48 AM, Erik Christiansen wrote: Is that diameter variation with depth, and if it's due to constant mark/space ratio, are you adjusting the timing ratio of the one-shots to achieve compensation? Erik, hello, Basically, yes :) The depth and diameter is governed by the joules expended per discharge, A fixed on time does not account for the pulse to pulse variation in ionization time ( how long it takes current flow to begin after voltage is applied). So I do not decrement the desired on time value until the current begins to flow. This makes the joules per discharge equal, and in turn, makes the craters equal. Instead of a repetitive pulser or PWM, I use one shots triggered by a detector. Tomp tjtr33 -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] EDM Pete G
On 03/04/2013 08:40 AM, sam sokolik wrote: oops - here are the pictures of his edm work http://electronicsam.com/images/Pete_G/edm.jpg http://electronicsam.com/images/Pete_G/edm_xc.jpg sam On 3/4/2013 8:30 AM, sam sokolik wrote: I had a little CNC get-together Saturday mainly to help Pete G setup his 5i25. Pete G had been mentioned recently on the list about his diy edm setup. He is using rutex step/dir drives and the rutex break out board. I sent peter from mesa the pinout of the rutex BOB and he sent a new firmware for the 5i25. Updating was painless and we looked at the port with a scope to double check that the step/dir pin locations had changed. I had found someones 5i25 config on the forum and set it up for Pete_G hardware. (he isn't using any daughter boards yet.) This is the email I got back from him after running all day sunday.. Hi Sam: I set up the Rutex based controller on by Bridgeport mill, edited the scale values in the .ini file and went zooming. It went in the right directions, and fast. I ran out of nerve at 3/4 inch per second/ 45 IPM. The machine never went as fast as 35 IPM before. The linuxcnc has a much nicer interface than the ancient version I was running. I like it a bunch. Thank you for working with me on this project. This is a great improvement over where I was. So that is a big YAY - he has a Dyna 4400 that he has starting converting. Thanks Peter(mesa) for your quick firmware mod and the overall coolness of your hardware :) He also talked a bit about his edm (couple emails). (his own software) You mentioned that my name came up on the list-serve about EDM work. Attached is a picture that shows a little embossing wheel that I made with coordinated X and C motion and a sample of wire EDM work I did. In both cases, the software executes the G-code forward and backward, whatever it takes to maintain the erosion gap voltage as needed. The sinker software will back out on a programmed basis, either along the pathway in or toward pre-programmed escape points. The wire program backs up a specified distance (regardless of the number of line segments traversed) and then follows a small X, trying to clear the crud and get sparking again. If that fails, the motion stops but controlling the wire travel speed or shutting off the wire was not included in the program. One day i'll do that and add other necessary features. I also have a picture (not attached) where I eroded with coordinated Z C motion and threaded a hole in a file. Attached is a picture that shows the roll-die and the threaded hole. For flushing, the threading electrode backed its way out of the hole. When making the roll-die, it was rolled across the face of a flat electrode with coordinated X C motion, with escape moves in the +Y direction for flushing/ gap contamination. You can post either of both of the pictures. I should have explained that the escape moves and backing out for flushing are NOT part of the g-code. The programmer couldn't possibly know at what points the electrode would need to be backed out. My software monitors that gap voltage and when it is too low it will create it's own destination_X, y, z, c values to move to in order to clear the problem. Once the erosion gap returns to normal, my software erodes its way back to the where it escaped from the program path and then continues on the programmed path. The key to EDM is to monitor erosion conditions (voltage) and to move forward and backward on the programmed path to maintain erosion conditions. Or escape off to the side if needed. Some people insist that there must be a feed rate in EDM. There is not. pete Thanks to all for all the hard work on the linuxcnc project!! sam -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Sam, Please tell Pete congratulations on his work. I've harped for years here that there is no feedrate. Right on Pete! I'm developing similar by myself. At the time I got your email, I was writing oneshots for arduino, triggered by the beginning of current flow, an OnTimeShot runs, then a single OffTimeShot. This makes each tiny crater a
Re: [Emc-users] EDM Pete G
On Monday 04 March 2013 22:13:36 TJoseph Powderly did opine: On 03/04/2013 08:40 AM, sam sokolik wrote: oops - here are the pictures of his edm work http://electronicsam.com/images/Pete_G/edm.jpg http://electronicsam.com/images/Pete_G/edm_xc.jpg sam On 3/4/2013 8:30 AM, sam sokolik wrote: I had a little CNC get-together Saturday mainly to help Pete G setup his 5i25. Pete G had been mentioned recently on the list about his diy edm setup. He is using rutex step/dir drives and the rutex break out board. I sent peter from mesa the pinout of the rutex BOB and he sent a new firmware for the 5i25. Updating was painless and we looked at the port with a scope to double check that the step/dir pin locations had changed. I had found someones 5i25 config on the forum and set it up for Pete_G hardware. (he isn't using any daughter boards yet.) This is the email I got back from him after running all day sunday.. Hi Sam: I set up the Rutex based controller on by Bridgeport mill, edited the scale values in the .ini file and went zooming. It went in the right directions, and fast. I ran out of nerve at 3/4 inch per second/ 45 IPM. The machine never went as fast as 35 IPM before. The linuxcnc has a much nicer interface than the ancient version I was running. I like it a bunch. Thank you for working with me on this project. This is a great improvement over where I was. So that is a big YAY - he has a Dyna 4400 that he has starting converting. Thanks Peter(mesa) for your quick firmware mod and the overall coolness of your hardware :) He also talked a bit about his edm (couple emails). (his own software) You mentioned that my name came up on the list-serve about EDM work. Attached is a picture that shows a little embossing wheel that I made with coordinated X and C motion and a sample of wire EDM work I did. In both cases, the software executes the G-code forward and backward, whatever it takes to maintain the erosion gap voltage as needed. The sinker software will back out on a programmed basis, either along the pathway in or toward pre-programmed escape points. The wire program backs up a specified distance (regardless of the number of line segments traversed) and then follows a small X, trying to clear the crud and get sparking again. If that fails, the motion stops but controlling the wire travel speed or shutting off the wire was not included in the program. One day i'll do that and add other necessary features. I also have a picture (not attached) where I eroded with coordinated Z C motion and threaded a hole in a file. Attached is a picture that shows the roll-die and the threaded hole. For flushing, the threading electrode backed its way out of the hole. When making the roll-die, it was rolled across the face of a flat electrode with coordinated X C motion, with escape moves in the +Y direction for flushing/ gap contamination. You can post either of both of the pictures. I should have explained that the escape moves and backing out for flushing are NOT part of the g-code. The programmer couldn't possibly know at what points the electrode would need to be backed out. My software monitors that gap voltage and when it is too low it will create it's own destination_X, y, z, c values to move to in order to clear the problem. Once the erosion gap returns to normal, my software erodes its way back to the where it escaped from the program path and then continues on the programmed path. The key to EDM is to monitor erosion conditions (voltage) and to move forward and backward on the programmed path to maintain erosion conditions. Or escape off to the side if needed. Some people insist that there must be a feed rate in EDM. There is not. pete Thanks to all for all the hard work on the linuxcnc project!! sam - - Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Sam, Please tell Pete congratulations on his work. I've harped for years here that there is no feedrate. Right on Pete! I'm developing
