Re: [Emc-users] off sub geography
On Sun, Feb 16, 2014 at 12:22 PM, Jon Elson el...@pico-systems.com wrote: OK, I am sure that we saw that building, but had no idea what it was! We were mostly just sleeping there, and then we went for a horseback ride, and went to my friend's cabin every day. Way too much driving for a vacation. We did eat at a couple places there, and went to the VERY rustic grocery store a couple times. But, I don't think we will likely visit Eminence again, the main reason to go out to the Ozarks is my friend's cabin. Now that I've found the secret to cleaning the place up so that my wife and kids can tolerate it, we just stay there. No AC, no phone, no internet (ugh), but it usually has running water and electricity. My oldest son is really good at fishing, and the rainbow trout and bass are great! Jon Are you guys talking about an area anywhere near Mt Home Arkansas? I've been sorta following this discussion, but not very closely. I go out there each fall in October to visit some very close friends (they're like family to me), do some fishing with my best bud I visit, and also attend the Southern Rodmakers Gathering at Fultons Lodge, Mt Home, on the White River. We fish the White and also the Norfork river too. There is some very good trout fishing in that area. Mark -- Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BBB variable voltage output for spindle speed
On Sun, Feb 16, 2014 at 3:15 PM, MC Cason farmerboy1...@yahoo.com wrote: Gene, I did a quick rendering of it, to show you what it should look like: http://www.flickr.com/photos/46689581@N03/12571498435/in/set-72157631724417372 http://www.flickr.com/photos/46689581@N03/1257155/in/set-72157631724417372 Nice. After years of repairing electronics, the only thing I'd do differently is socket the chips. Mark -- Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] off sub geography
The two towns mentioned are Alton Missouri Eminence Missouri quite a ways from Mt Home Arkansas On Mon, Feb 17, 2014 at 6:28 AM, Mark Wendt wendt.m...@gmail.com wrote: On Sun, Feb 16, 2014 at 12:22 PM, Jon Elson el...@pico-systems.com wrote: OK, I am sure that we saw that building, but had no idea what it was! We were mostly just sleeping there, and then we went for a horseback ride, and went to my friend's cabin every day. Way too much driving for a vacation. We did eat at a couple places there, and went to the VERY rustic grocery store a couple times. But, I don't think we will likely visit Eminence again, the main reason to go out to the Ozarks is my friend's cabin. Now that I've found the secret to cleaning the place up so that my wife and kids can tolerate it, we just stay there. No AC, no phone, no internet (ugh), but it usually has running water and electricity. My oldest son is really good at fishing, and the rainbow trout and bass are great! Jon Are you guys talking about an area anywhere near Mt Home Arkansas? I've been sorta following this discussion, but not very closely. I go out there each fall in October to visit some very close friends (they're like family to me), do some fishing with my best bud I visit, and also attend the Southern Rodmakers Gathering at Fultons Lodge, Mt Home, on the White River. We fish the White and also the Norfork river too. There is some very good trout fishing in that area. Mark -- Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. -- Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] off sub geography
Not far from me... JT On 2/17/2014 7:06 AM, Stuart Stevenson wrote: The two towns mentioned are Alton Missouri Eminence Missouri quite a ways from Mt Home Arkansas On Mon, Feb 17, 2014 at 6:28 AM, Mark Wendt wendt.m...@gmail.com wrote: On Sun, Feb 16, 2014 at 12:22 PM, Jon Elson el...@pico-systems.com wrote: OK, I am sure that we saw that building, but had no idea what it was! We were mostly just sleeping there, and then we went for a horseback ride, and went to my friend's cabin every day. Way too much driving for a vacation. We did eat at a couple places there, and went to the VERY rustic grocery store a couple times. But, I don't think we will likely visit Eminence again, the main reason to go out to the Ozarks is my friend's cabin. Now that I've found the secret to cleaning the place up so that my wife and kids can tolerate it, we just stay there. No AC, no phone, no internet (ugh), but it usually has running water and electricity. My oldest son is really good at fishing, and the rainbow trout and bass are great! Jon Are you guys talking about an area anywhere near Mt Home Arkansas? I've been sorta following this discussion, but not very closely. I go out there each fall in October to visit some very close friends (they're like family to me), do some fishing with my best bud I visit, and also attend the Southern Rodmakers Gathering at Fultons Lodge, Mt Home, on the White River. We fish the White and also the Norfork river too. There is some very good trout fishing in that area. Mark -- Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Fwd: Re: Gantry Best Practices
Charles, I think you know my vote. 1) Never assume the user is anything other than a complete amateur. We are putting tons of these machines in schools now. 2) I believe this is the right way to do this. If the BBB cannot do this, we will be forced to add a secondary microcontroller in the pulse stream to apply the logic that we need to do this. Seems kinda silly since the software could do it. If I only knew more about LCNC programming, it already would. This is the one thing that's preventing us from moving all of our machines to the BBB immediately. 3) I am really surprised that this works at all without blowing the drivers. You cannot guarantee that both motors are identical. Len On 2/16/2014 7:47 PM, Dave Cole wrote: If you can control the current settings on the stepper drives, lower the torque settings and drive the gantry axes steppers together into the hard stops, set the axes to home, then reset the torque settings to normal. Dave On 2/16/2014 3:11 PM, Charles Steinkuehler wrote: With the recent release and general popularity of the ShapeOko V2 desktop mini-mill, I have several folks who are trying to use LinuxCNC running on the BeagleBone as a control. If you are unfamiliar with this machine, here's a link: https://www.inventables.com/technologies/desktop-cnc-mill-kit-shapeoko-2 Invariably, one of the first questions I get is how to setup a configuration to deal with the gantry setup of the ShapeOko. I know of at least three different ways to control a gantry system with LinuxCNC, each with it's own pros and cons: 1) Use gantrykins, and hope users are intelligent enough not to rack the gantry when moving around in joint mode. 2) Use trivkins and setup HAL to turn one axis into two by craftily combining the commanded motion with the homing switch states. This is easiest if HAL is doing software stepgen (just mask the step pulses in the base thread), but I'm pretty confident I can make this work pushing the logic in front of the PRU drive step/dir component (as a bonus, this setup would also work with Mesa hm2 cards and other hardware based controllers). 3) Ignore the gantry complexity, and just drive both servo motors from the same stepper driver. This works _OK_ for the Z axis on a 3D printer, but probably isn't a good idea for something that is actually making chips. Questions: Did I miss any significant options for controlling a gantry style machine? Which option would be recommended for novice users new to the LinuxCNC and CNC world? I'm thinking the Magic HAL Wye / Y Cable that splits one joint into two is probably the simplest for most folks to deal with, but am open to suggestions. -- Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Len Shelton Applications Engineer PROBOTIX 8800-B N. Industrial Rd. Peoria, IL. 61615 Email: l...@probotix.com Phone: (309) 691-2643 -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] off sub geography
It's only 100 miles from Mountain Home Ar. to Eminence Mo and some of the most beautiful scenery along the way JT On 2/17/2014 7:11 AM, Mark Wendt wrote: On Mon, Feb 17, 2014 at 8:06 AM, Stuart Stevenson stus...@gmail.com wrote: The two towns mentioned are Alton Missouri Eminence Missouri quite a ways from Mt Home Arkansas Ah, okay, that's too bad. I was hoping it might be closer for a possible day trip when I'm up in that neck of the woods. Thanks Stuart. Mark -- Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Fwd: Re: Gantry Best Practices
On 2/17/2014 11:41 AM, Len Shelton wrote: Charles, I think you know my vote. 1) Never assume the user is anything other than a complete amateur. We are putting tons of these machines in schools now. PEBKAM! :) 2) I believe this is the right way to do this. If the BBB cannot do this, we will be forced to add a secondary microcontroller in the pulse stream to apply the logic that we need to do this. Seems kinda silly since the software could do it. If I only knew more about LCNC programming, it already would. This is the one thing that's preventing us from moving all of our machines to the BBB immediately. Yeah, this is the solution I'm leaning towards. I appreciate the concept of gantrykins, but given how LinuxCNC deals with non-trivial kins, I don't think it's the way to go unless you really have a non-Cartesian mechanism. As soon as I'm done with the encoder stuff I'm working on, I'll whip up an N-axis HAL gantry module. My linear-delta printer will make a good test-bed for a 3-Axis gantry. In addition to avoiding the user racks the gantry in joint mode problem, the HAL component will fix problems with homing if HOME != HOMEOFFSET, at least for the simple gantry case. If anyone listening in doesn't know what I'm referring to, setup a gantrykins machine with a significant distance between the HOME and HOMEOFFSET positions, home your gantry axis, then watch in horror as one side of the gantry finishes homing and rapids to the HOME location while the other side is still poking around at HOMEOFFSET waiting for the home switch to release. ouch! 3) I am really surprised that this works at all without blowing the drivers. You cannot guarantee that both motors are identical. Yes, it's a total hack, but it works OK for things like the Z axis of a 3D printer, which moves _really slow_ most of the time. -- Charles Steinkuehler char...@steinkuehler.net signature.asc Description: OpenPGP digital signature -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Fwd: Re: Gantry Best Practices
3) I am really surprised that this works at all without blowing the drivers. You cannot guarantee that both motors are identical. You can feed two same identical step/dir inputs to multiple drivers. That is how my commercial accucut (48 sq) gantry did it. In theory, you could run an infinite number of parallel complete machines all mass producing the same thing if using steppers (signal driver fanout limitations ignored.) SMD -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] off sub geography
On 02/17/2014 06:28 AM, Mark Wendt wrote: Are you guys talking about an area anywhere near Mt Home Arkansas? I've been sorta following this discussion, but not very closely. I go out there each fall in October to visit some very close friends (they're like family to me), do some fishing with my best bud I visit, and also attend the Southern Rodmakers Gathering at Fultons Lodge, Mt Home, on the White River. We fish the White and also the Norfork river too. There is some very good trout fishing in that area. Well, Eminence is in the Mo Ozarks, not all THAT far from Arkansas. My friend's cabin is about 2 miles from Montauk Lodge, where the Current River sprouts up from a hole in the ground. That's pretty central MO. Jon -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Fwd: Re: Gantry Best Practices
True, but what happens if you stall one side out (ie tool comes loose from the collet and digs into the spoil board while off to one side of the machine). Having a proper homing sequence allows you to resquare the gantry by simply rehoming. We use this on our larger machines and it works beautifully. Len 3) I am really surprised that this works at all without blowing the drivers. You cannot guarantee that both motors are identical. You can feed two same identical step/dir inputs to multiple drivers. That is how my commercial accucut (48 sq) gantry did it. In theory, you could run an infinite number of parallel complete machines all mass producing the same thing if using steppers (signal driver fanout limitations ignored.) SMD - -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Linuxcnc and Shuttlexpress
I eventually got my shuttlexpress working with Linuxcnc today. It turned out to be so easy in the end.(Well with a little help from the nice people on here) Now i can jog and increment around the table without dragging the keyboard round. Just on adding a panel to the axis gui to give me some feedback about buttons and increments selected. -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Gantry Best Practices
On Sun, 16 Feb 2014 16:51:06 -0600, you wrote: On 2/16/2014 4:03 PM, Steve Blackmore wrote: On Sun, 16 Feb 2014 14:11:13 -0600, you wrote: With the recent release and general popularity of the ShapeOko V2 desktop mini-mill, I have several folks who are trying to use LinuxCNC running on the BeagleBone as a control. If you are unfamiliar with this machine, here's a link: https://www.inventables.com/technologies/desktop-cnc-mill-kit-shapeoko-2 Cant help with the best way to run that with LinuxCNC, but I'd be tempted to remove one stepper and run a cross shaft driving both belts with possibly a bigger stepper motor. Sorry, but I don't consider changing the machine to fit the tool to be an acceptable solution. Then your stuck with a known problematic design. I wish I had a pound for each complaint/query/moan I've seen and heard about twin steppers on a gantry machine. Other fixes include servos or closed loop steppers but keeping both sides in synch with software without any feedback is nigh on impossible. Steve Blackmore -- -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Gantry Best Practices
On 2/17/2014 4:47 PM, Steve Blackmore wrote: On Sun, 16 Feb 2014 16:51:06 -0600, you wrote: On 2/16/2014 4:03 PM, Steve Blackmore wrote: On Sun, 16 Feb 2014 14:11:13 -0600, you wrote: With the recent release and general popularity of the ShapeOko V2 desktop mini-mill, I have several folks who are trying to use LinuxCNC running on the BeagleBone as a control. If you are unfamiliar with this machine, here's a link: https://www.inventables.com/technologies/desktop-cnc-mill-kit-shapeoko-2 Cant help with the best way to run that with LinuxCNC, but I'd be tempted to remove one stepper and run a cross shaft driving both belts with possibly a bigger stepper motor. Sorry, but I don't consider changing the machine to fit the tool to be an acceptable solution. Then your stuck with a known problematic design. I wish I had a pound for each complaint/query/moan I've seen and heard about twin steppers on a gantry machine. Other fixes include servos or closed loop steppers but keeping both sides in synch with software without any feedback is nigh on impossible. Steppers are not the problem, the issues I mentioned apply equally to machines with servos and encoder feedback. I'm asking for the suggested best way to configure LinuxCNC for controlling a gantry system, that presents the user with the least opportunity to shoot themselves in the foot. For instance, how do you avoid racking the gantry when jogging in joint mode? Do you have a servo gantry config that avoids or minimizes this possibility you could point me to? I know folks are controlling gantry systems with LinuxCNC, I'm wanting to know how, and what are the pros and cons of each setup. -- Charles Steinkuehler char...@steinkuehler.net signature.asc Description: OpenPGP digital signature -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] off sub geography
alton to mt home 75 miles , i have friends and family there as well. agreed the white and norfork are beautiful with excellent fishing indeed jeremy youngs On Mon, Feb 17, 2014 at 1:24 PM, Jon Elson el...@pico-systems.com wrote: On 02/17/2014 06:28 AM, Mark Wendt wrote: Are you guys talking about an area anywhere near Mt Home Arkansas? I've been sorta following this discussion, but not very closely. I go out there each fall in October to visit some very close friends (they're like family to me), do some fishing with my best bud I visit, and also attend the Southern Rodmakers Gathering at Fultons Lodge, Mt Home, on the White River. We fish the White and also the Norfork river too. There is some very good trout fishing in that area. Well, Eminence is in the Mo Ozarks, not all THAT far from Arkansas. My friend's cabin is about 2 miles from Montauk Lodge, where the Current River sprouts up from a hole in the ground. That's pretty central MO. Jon -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] spindle drive parts for a 7x12 lathe
Greetings all; My google foo seems to be on strike, I can't even find the pulley I put on the jackshaft I made to put a 1.5hp motor on this 7x12 last year. That pulley has a 9mm bore, broached for a 3mm square key,one removable flange, 9.1mm between the flanges, with a 30mm OD flange, and 20mm long hub. This one made of ABS and was pretty well burned up last night. I count whats left of the teeth at 20 of them, but there is physical room for 24 in the area. That is the pulley on the jackshaft, located at the bottom of the old drive belt where the original motor drove it. The upper pulley is flangeless and hubless, bored for a 10mm shaft and keyed for a 4mm square key. I count 34 teeth on that one. I want to replace both pulleys with either alu or sintered steel versions, along with a fresh much higher quality belt, 3/8 or 9mm wide. I hit the top dozen or so pages google gave me, and no one has the lower pulley in a 9mm bore regardless of the material. Has anyone a better place, or a favorite place to buy such oddball stuffs? 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) Genes Web page http://geneslinuxbox.net:6309/gene NOTICE: Will pay 100 USD for an HP-4815A defective but complete probe assembly. -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] spindle drive parts for a 7x12 lathe
Try these guys out ... if they don't have it, I have other links I can dig up. Dave https://sdp-si.com/eStore/CoverPg/Drive_Components.htm On 2/17/2014 9:12 PM, Gene Heskett wrote: Greetings all; My google foo seems to be on strike, I can't even find the pulley I put on the jackshaft I made to put a 1.5hp motor on this 7x12 last year. That pulley has a 9mm bore, broached for a 3mm square key,one removable flange, 9.1mm between the flanges, with a 30mm OD flange, and 20mm long hub. This one made of ABS and was pretty well burned up last night. I count whats left of the teeth at 20 of them, but there is physical room for 24 in the area. That is the pulley on the jackshaft, located at the bottom of the old drive belt where the original motor drove it. The upper pulley is flangeless and hubless, bored for a 10mm shaft and keyed for a 4mm square key. I count 34 teeth on that one. I want to replace both pulleys with either alu or sintered steel versions, along with a fresh much higher quality belt, 3/8 or 9mm wide. I hit the top dozen or so pages google gave me, and no one has the lower pulley in a 9mm bore regardless of the material. Has anyone a better place, or a favorite place to buy such oddball stuffs? Cheers, Gene -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] spindle drive parts for a 7x12 lathe
On Monday 17 February 2014 21:54:36 Dave Cole did opine: Try these guys out ... if they don't have it, I have other links I can dig up. Dave https://sdp-si.com/eStore/CoverPg/Drive_Components.htm That is the same link someone gave me this afternoon on IRC. None with 9mm hubs can be found there. Thanks Dave. I guess I'll yell at Chris Wood tomorrow (LittleMachineShop.com), he has at times been helpful. On 2/17/2014 9:12 PM, Gene Heskett wrote: Greetings all; My google foo seems to be on strike, I can't even find the pulley I put on the jackshaft I made to put a 1.5hp motor on this 7x12 last year. That pulley has a 9mm bore, broached for a 3mm square key,one removable flange, 9.1mm between the flanges, with a 30mm OD flange, and 20mm long hub. This one made of ABS and was pretty well burned up last night. I count whats left of the teeth at 20 of them, but there is physical room for 24 in the area. That is the pulley on the jackshaft, located at the bottom of the old drive belt where the original motor drove it. The upper pulley is flangeless and hubless, bored for a 10mm shaft and keyed for a 4mm square key. I count 34 teeth on that one. I want to replace both pulleys with either alu or sintered steel versions, along with a fresh much higher quality belt, 3/8 or 9mm wide. I hit the top dozen or so pages google gave me, and no one has the lower pulley in a 9mm bore regardless of the material. Has anyone a better place, or a favorite place to buy such oddball stuffs? Cheers, Gene -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.cl ktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users 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) Genes Web page http://geneslinuxbox.net:6309/gene NOTICE: Will pay 100 USD for an HP-4815A defective but complete probe assembly. -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Fwd: Re: Gantry Best Practices
On 2/17/2014 12:15 PM, Charles Steinkuehler wrote: On 2/17/2014 11:41 AM, Len Shelton wrote: On 2/16/2014 3:11 PM, Charles Steinkuehler wrote: 2) Use trivkins and setup HAL to turn one axis into two by craftily combining the commanded motion with the homing switch states. This is easiest if HAL is doing software stepgen (just mask the step pulses in the base thread), but I'm pretty confident I can make this work pushing the logic in front of the PRU drive step/dir component (as a bonus, this setup would also work with Mesa hm2 cards and other hardware based controllers). 2) I believe this is the right way to do this. If the BBB cannot do this, we will be forced to add a secondary microcontroller in the pulse stream to apply the logic that we need to do this. Seems kinda silly since the software could do it. If I only knew more about LCNC programming, it already would. This is the one thing that's preventing us from moving all of our machines to the BBB immediately. Yeah, this is the solution I'm leaning towards. I appreciate the concept of gantrykins, but given how LinuxCNC deals with non-trivial kins, I don't think it's the way to go unless you really have a non-Cartesian mechanism. As soon as I'm done with the encoder stuff I'm working on, I'll whip up an N-axis HAL gantry module. My linear-delta printer will make a good test-bed for a 3-Axis gantry. In addition to avoiding the user racks the gantry in joint mode problem, the HAL component will fix problems with homing if HOME != HOMEOFFSET, at least for the simple gantry case. OK, I'm not done with the encoder logic yet, but I decided to take a break and make your gantry HAL module. It turned out to be slightly trickier than expected, because even at homing speed on my system and with fairly high accelerations the axis didn't just stop nicely after hitting the switch, even though it was being commanded to. Since I can't just mask the generated step signals, something more sophisticated was required. So I added some sticky multiplexing logic that uses one of the slave joints for feedback (it could be any of them), but hops around to track active joints when homing. Basically the module generates multiple commanded positions using an offset for each joint. The offset is fixed while all home switches are in the same state (either all closed or all open). If *SOME* of the home switches are closed and movement is towards the home switches (direction matches HOME_SEARCH_VEL), than the joints with closed home switches are disabled by changing their offset value rather than their commanded position, until all home switches are closed, at which point the joints are run in lock-step again. Otherwise, it's basically the same concept as the software stepgen HAL step masking code provided to me by Les Shelton, which he says came from one of the EMC lists some time ago. For best results, make sure that HOME_SEARCH_VEL and HOME_LATCH_VEL are the same sign (move in the same direction), since there is no special behavior when moving the joints off of home. I also recommend running as slow as practical for both velocities. The code is introducing discontinuities in velocity (instantly changing from commanding the home search velocity to commanding a full stop), so you wouldn't want to run very fast on something with lots of mass. It works pretty well on my linear-delta Kossel, however. Oh...and just for grins, you can have up to 7 slave joints, and I have tested with three. If it doesn't work for your dual-motor gantry, just get another motor! :) ...and I have only tested on a BeagleBone with PRU driven step/dir, but the comp should work to drive any other off-cpu based control, including Mesa hm2 step/dir and servo setups. The main drawback is only one joint is used to generate feedback into motion, so there's no alarm raised if one side of the gantry gets stuck but the other is still moving. Adding that is left as an exercise for the reader! :) Hopefully, the man page makes usage obvious, if not, let me know. The read thread should run after capturing the current position from your stepgen/encoders, and before motion. The write thread should run after motion, and before your motor controller update function. -- Charles Steinkuehler char...@steinkuehler.net /** * * Copyright (C) 2014 Charles Steinkuehler (charles AT steinkuehler DOT net) * * * This module allows multiple drive motors (joints) to be connected to a * single motion axis. This is useful for gantry style machines if you don't * want to use gantrykins * ** * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your
Re: [Emc-users] Gantry Best Practices
Charles, I use LCNC on gantry routers and plasma machines with dual steppers on the X axis all the time. I simply slave the second motor in the HAL file with an inverted DIR signal. I have my motors driving on a Rack and Pinion setup always and I have a spring loaded motor plate to apply constant tension to the pinion. If need be one can just release the motors and place the gantry in a neutral position before homing. I found that if the machine is setup to be NOT close to it maximum performance, it will never give any problems. If the gantry has racked, I simply run it into the stops slowly and the slippage will correct the skew. I have never had the need to run a router in joint mode so I dont have the problems that come with that. For my sake please explain the use of joint mode with the router. On 2014-02-18 01:19, Charles Steinkuehler wrote: On 2/17/2014 4:47 PM, Steve Blackmore wrote: On Sun, 16 Feb 2014 16:51:06 -0600, you wrote: On 2/16/2014 4:03 PM, Steve Blackmore wrote: On Sun, 16 Feb 2014 14:11:13 -0600, you wrote: With the recent release and general popularity of the ShapeOko V2 desktop mini-mill, I have several folks who are trying to use LinuxCNC running on the BeagleBone as a control. If you are unfamiliar with this machine, here's a link: https://www.inventables.com/technologies/desktop-cnc-mill-kit-shapeoko-2 Cant help with the best way to run that with LinuxCNC, but I'd be tempted to remove one stepper and run a cross shaft driving both belts with possibly a bigger stepper motor. Sorry, but I don't consider changing the machine to fit the tool to be an acceptable solution. Then your stuck with a known problematic design. I wish I had a pound for each complaint/query/moan I've seen and heard about twin steppers on a gantry machine. Other fixes include servos or closed loop steppers but keeping both sides in synch with software without any feedback is nigh on impossible. Steppers are not the problem, the issues I mentioned apply equally to machines with servos and encoder feedback. I'm asking for the suggested best way to configure LinuxCNC for controlling a gantry system, that presents the user with the least opportunity to shoot themselves in the foot. For instance, how do you avoid racking the gantry when jogging in joint mode? Do you have a servo gantry config that avoids or minimizes this possibility you could point me to? I know folks are controlling gantry systems with LinuxCNC, I'm wanting to know how, and what are the pros and cons of each setup. -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Regards /Groete Marius D. Liebenberg +27 82 698 3251 +27 12 743 6064 -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] spindle drive parts for a 7x12 lathe
I suspect that someone will have to drill/ream some standard bore pulleys for you to get 9mm. I think that they will do that for you. Click on the quote request and ask them to supply them with 9mm bores. Dave On 2/17/2014 9:58 PM, Gene Heskett wrote: On Monday 17 February 2014 21:54:36 Dave Cole did opine: Try these guys out ... if they don't have it, I have other links I can dig up. Dave https://sdp-si.com/eStore/CoverPg/Drive_Components.htm That is the same link someone gave me this afternoon on IRC. None with 9mm hubs can be found there. Thanks Dave. I guess I'll yell at Chris Wood tomorrow (LittleMachineShop.com), he has at times been helpful. On 2/17/2014 9:12 PM, Gene Heskett wrote: Greetings all; My google foo seems to be on strike, I can't even find the pulley I put on the jackshaft I made to put a 1.5hp motor on this 7x12 last year. That pulley has a 9mm bore, broached for a 3mm square key,one removable flange, 9.1mm between the flanges, with a 30mm OD flange, and 20mm long hub. This one made of ABS and was pretty well burned up last night. I count whats left of the teeth at 20 of them, but there is physical room for 24 in the area. That is the pulley on the jackshaft, located at the bottom of the old drive belt where the original motor drove it. The upper pulley is flangeless and hubless, bored for a 10mm shaft and keyed for a 4mm square key. I count 34 teeth on that one. I want to replace both pulleys with either alu or sintered steel versions, along with a fresh much higher quality belt, 3/8 or 9mm wide. I hit the top dozen or so pages google gave me, and no one has the lower pulley in a 9mm bore regardless of the material. Has anyone a better place, or a favorite place to buy such oddball stuffs? Cheers, Gene -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.cl ktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Gantry Best Practices
On 2/17/2014 3:47 PM, Steve Blackmore wrote: On Sun, 16 Feb 2014 16:51:06 -0600, you wrote: Sorry, but I don't consider changing the machine to fit the tool to be an acceptable solution. Then your stuck with a known problematic design. I wish I had a pound for each complaint/query/moan I've seen and heard about twin steppers on a gantry machine. Other fixes include servos or closed loop steppers but keeping both sides in synch with software without any feedback is nigh on impossible. It's such a simple design concept to run a shaft across the gantry to connect to a chain or belt or rack on both sides, or to use a screw down each side and connect them at one or both ends with a chain or belt. Never racks, ever, and doesn't use up two motor control outputs from the control electronics. A friend of mine has a big Torchmate table, uses a rod across the gantry with a rack on each side, rod is turned by a cogged belt. Don't ask me why they used an ACME threaded rod when nothing runs on the threads! Plain shaft would work just as well. A while back on this list, someone was attempting to replace the control on a Thermwood gantry router with a PC and LCNC. Thermwood used a motor on each end of the gantry, and to make it especially challenging the gantry stretched across the long dimension of the table. Never had any racking problems with the OEM control but the person doing the refit couldn't get it to work with LCNC. I would have just got out the tools etc and fixed the @#%$@% thing to use a cross shaft rather than screw around trying to use software to fix a hardware design problem. What might provide some insight into an anti-racking system is to study how pivot sprinkler lines are made to handle fields which are not perfectly flat. They have sensors at each wheel pylon that detect if that point is advancing or lagging then the speed is adjusted to get it back in line so the pipe doesn't end up kinking and wound up around the pivot like a dog that's too dumb to change directions when it gets its chain wound up. Design the gantry with the end bases long and stable then have the cross bar mounted so it can pivot just a little. Add sensors to detect the tiniest amount of racking then have a system to automatically adjust the speed of each side to straighten it out. That could be completely independent of the CNC control. But still far more complex than mechanically coupling the ends of the gantry. -- Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
