Re: [Emc-users] Outrunners
On 25 February 2012 02:55, Jon Elson el...@pico-systems.com wrote: The effect of this is (I think) that the back-emf is very small, and the current very high, for a given torque. HUH? On a permanent magnet motor, the back EMF is determined entirely by the magnets, and will be the same with or without driving current. The back-emf in any particular field winding will be independent of the current, but the field windings which are driven by the H-bridge at any one time will be different between a properly commutated bldc with a 90 degree phase shift and one being driven effectively as a low-pole-count infinite-microstepping stepper motor. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On 25 February 2012 10:15, andy pugh bodge...@gmail.com wrote: The back-emf in any particular field winding will be independent of the current, but the field windings which are driven by the H-bridge at any one time will be different between a properly commutated bldc with a 90 degree phase shift and one being driven effectively as a low-pole-count infinite-microstepping stepper motor. Thinking further, whilst I think the above is correct, a bigger effect might be that a VFD runs at a fixed current and a speed-controlling PID in LinuxCNC can only vary the frequency (which increases torque at a constant load speed in an induction motor, but doesn't in a synchronous motor, which can only lose synch if drive frequency and spindle speed don't match). In the case of a bldc drive the PID loop varies the current (and it will typically be low at low load) and the field is always in synch. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
100K / 60 * 2(poles) = electrical rpms. You'll need to run the pwm well over 100Khz to do this. The lowly dspic33f mc motor series will struggle to do this, let alone any additional processing. My thought was to not run PWM but only direct switching at a base frequency of a few kHz and without any sensing of rotor angle. The rotor will run well once it is locked in to the rotating field from the stator. Crude, but it works. What is the reference to ancient times? The BLDC core design is perceived as a very late principle but the basic design with a constantly magnetized rotor and a three phase excited stator is very old. Of course hall sensors and MOSFET H-bridges came in a little later than 1910. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
While 10 RPM is pretty impressive mechanicalvise, it is only 1700 Hz on a two-pole motor. A BLDC is similar to a syncronous three phase motor that was used much for really high power apps in ancient times, maybe even today. Typical example is a city water supply pump. They had to be brought up to the right speed before being connected to the supply, they were not self starting. You can run a BLDC from a dumb fixed frequency three phase supply if only you can get it to spin in the first place. // Lars -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
100K / 60 * 2(poles) = electrical rpms. You'll need to run the pwm well over 100Khz to do this. The lowly dspic33f mc motor series will struggle to do this, let alone any additional processing. I think there is something else though, it seems that a bldc has less torque from a fixed frequency than a sinusoidal wound 3 phase, but I don't really understand it completely. What is the reference to ancient times? On Fri, Feb 24, 2012 at 12:30 PM, Lars Andersson l...@larsandersson.comwrote: While 10 RPM is pretty impressive mechanicalvise, it is only 1700 Hz on a two-pole motor. A BLDC is similar to a syncronous three phase motor that was used much for really high power apps in ancient times, maybe even today. Typical example is a city water supply pump. They had to be brought up to the right speed before being connected to the supply, they were not self starting. You can run a BLDC from a dumb fixed frequency three phase supply if only you can get it to spin in the first place. // Lars -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
Of course, if you use hall effect sensors it would be easier. Some folks add hall effect sensors to outrunners, it works fine. On Fri, Feb 24, 2012 at 1:08 PM, andy pugh bodge...@gmail.com wrote: On 24 February 2012 17:30, Lars Andersson l...@larsandersson.com wrote: You can run a BLDC from a dumb fixed frequency three phase supply if only you can get it to spin in the first place. It will probably start from rest, certainly with a soft-starting VFD, and will run synchronously. However, running synchronously the phase lead will depend only on load, and will be very small. The field will be almost 100% direct and zero quadrature. The effect of this is (I think) that the back-emf is very small, and the current very high, for a given torque. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
andy pugh wrote: It will probably start from rest, certainly with a soft-starting VFD, and will run synchronously. However, running synchronously the phase lead will depend only on load, and will be very small. The field will be almost 100% direct and zero quadrature. The effect of this is (I think) that the back-emf is very small, and the current very high, for a given torque. HUH? On a permanent magnet motor, the back EMF is determined entirely by the magnets, and will be the same with or without driving current. The BEMF will be exactly proportional to RPM. That's not the case with an induction motor, of course. Jon -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
Hi Kirk, saw that you are strugling for outrunners for model air planes, cars or boats. Look at http://www.hobbyking.com/hobbyking/store/index.rc for quite good and afordable motors and ESC's. The number of rpm's depend on the type of motor and the aplyed voltage. You can calculate this by multiplying the voltage with value of kv (e.g. 1024kv). For the ESC take one that has some reserve, meaning when the motor takes a maximum current of 60A take an ESC for 80A continuous or more. Cheaper motors also have cheaper bearings. Some motors have a fan mounted on the housing. These are normaly designed for helicopters, because in a helicopter you don't have a cooling air current. Just as an example http://www.hobbyking.com/hobbyking/store/__9021__Turnigy_Typhoon_450H_2215H_ Heli_Motor_3550kv_450_class_.html. Regards Peter -Ursprüngliche Nachricht- Von: Eric Keller [mailto:eekel...@psu.edu] Gesendet: Donnerstag, 23. Februar 2012 00:22 An: Enhanced Machine Controller (EMC) Betreff: Re: [Emc-users] Outrunners On Wed, Feb 22, 2012 at 4:34 PM, andy pugh bodge...@gmail.com wrote: Bear in mind that cooling might be inadequate without a huge propellor on the front, so expect to derate. RC cars use inrunners with heat sinks, so air must not be an absolute requirement. Probably a good idea though Eric -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On 23 February 2012 19:56, Kirk Wallace kwall...@wallacecompany.com wrote: If I where to stick with an outrunner solution, one thing comes to mind, I could get a kit and wind the motor for 220 and use a VFD. Can you? I thought they were brushless? A VFD will rotate them, but the phase lead will be about zero, so the efficiency will be awful. A flux-vector VFD _might_ be enough like a sensorless BLDC controller to work, I wouldn't know about that. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
It has been mentioned in this thread already, but I think it can be clarified. Outrunners when they appeared were a blessing for the R/C plane builder, since a propeller wants to run at speeds below 10 000 RPM for best efficency and earlier motors did maybe 20-30 000 RPM so they had to be geared. The new outrunners had the torque already at lower RPM so no downgearing was needed anymore. For PCB milling on the other hand with carbide bits of 0.3 mm dia or so you cannot get to much RPM really, 50-100 000 RPM is desirable to get a decent cutting speed. This is not what outrunners are optimised for. You would be better off with a long narrow inrunner of the same power as the short fat outrunner. // Lars -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On 23 February 2012 21:04, Lars Andersson l...@larsandersson.com wrote: For PCB milling on the other hand with carbide bits of 0.3 mm dia or so you cannot get to much RPM really, 50-100 000 RPM is desirable to get a decent cutting speed. This is not what outrunners are optimised for. You would be better off with a long narrow inrunner of the same power as the short fat outrunner. You can probably bury the motor up inside the taper too, for a nice big heat-sink. Were you going to use external bearings, or rely on the motor bearings? -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
Another advantage of inrunners is that you can directly cool the stator which is where you're generating all the heat. On bigger motors (Im talking from forktruck/golfcar motor size experience), DC armatures had a similar problem (as outrunners). You're dumping a lot of heat into something thats impossible to heatsink. It was a lot easier to cool the separately excited dc stator since you can simply fin the motor housing. AC motors, both PM and induction, can be designed so there is very little heat in the rotor that you have to get rid of. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On Thu, 2012-02-23 at 20:10 +, andy pugh wrote: On 23 February 2012 19:56, Kirk Wallace kwall...@wallacecompany.com wrote: If I where to stick with an outrunner solution, one thing comes to mind, I could get a kit and wind the motor for 220 and use a VFD. Can you? I thought they were brushless? A VFD will rotate them, but the phase lead will be about zero, so the efficiency will be awful. A flux-vector VFD _might_ be enough like a sensorless BLDC controller to work, I wouldn't know about that. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On Thu, 2012-02-23 at 20:10 +, andy pugh wrote: ... snip Can you? I thought they were brushless? They are. A VFD will rotate them, but the phase lead will be about zero, so the efficiency will be awful. Maybe that's why it didn't work when I tried using a VFD on a normal brushless motor. A flux-vector VFD _might_ be enough like a sensorless BLDC controller to work, I wouldn't know about that. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
I doubt any vfd would handle high rpms anyway. I think you would need to stay with a 2 pole for those rpm's, or you would have to have a pretty fancy driver. Bldc's aren't the right wave shape for vfds. On Thu, Feb 23, 2012 at 7:46 PM, Kirk Wallace kwall...@wallacecompany.comwrote: On Thu, 2012-02-23 at 20:10 +, andy pugh wrote: ... snip Can you? I thought they were brushless? They are. A VFD will rotate them, but the phase lead will be about zero, so the efficiency will be awful. Maybe that's why it didn't work when I tried using a VFD on a normal brushless motor. A flux-vector VFD _might_ be enough like a sensorless BLDC controller to work, I wouldn't know about that. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Outrunners
I want to mount an outrunner (or other) to a NMTB40 tool holder to try some circuit board routing. I like the outrunner form because it looks like the motors seem shorter for the same power. I haven't flown model planes for over twenty years so I've lost my feel for sizes and capacities. Does anyone have any experience with outrunners for milling applications? I'm looking at getting a cheap motor to experiment with then build on the experience, so the motor will need to be in the disposable price range. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
Le 22.02.2012 21:48, Kirk Wallace a écrit : I want to mount an outrunner (or other) to a NMTB40 tool holder to try some circuit board routing. I like the outrunner form because it looks like the motors seem shorter for the same power. I haven't flown model planes for over twenty years so I've lost my feel for sizes and capacities. Does anyone have any experience with outrunners for milling applications? I'm looking at getting a cheap motor to experiment with then build on the experience, so the motor will need to be in the disposable price range. for PCB routing, inrunner will be better, as you need as much speed as possible (40k to 100k rpm). I do some trials by the past with a cheap inrunner, abd even without load the temperature rise was too quick to allow any real use. I was strongly suspecting the VFD, as cheap as the motor... but I never spend more time on it, I got a 24'000 rpm spindle that is OK (but way too slow to make fast routing) I'm right now waiting for a chinese spindle than must reach 60'000 rpm, will see, this shall give a big up to ma PCB routing speed. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
You could take a look at the marine applications (inrunners), there are some water cooled. What will your supply be? You'll want to decide what rpm you want to run, as the higher kv, the lower the torque. Are you going to belt drive, or direct drive some way? On Wed, Feb 22, 2012 at 3:58 PM, Claude Froidevaux men...@bluewin.chwrote: Le 22.02.2012 21:48, Kirk Wallace a écrit : I want to mount an outrunner (or other) to a NMTB40 tool holder to try some circuit board routing. I like the outrunner form because it looks like the motors seem shorter for the same power. I haven't flown model planes for over twenty years so I've lost my feel for sizes and capacities. Does anyone have any experience with outrunners for milling applications? I'm looking at getting a cheap motor to experiment with then build on the experience, so the motor will need to be in the disposable price range. for PCB routing, inrunner will be better, as you need as much speed as possible (40k to 100k rpm). I do some trials by the past with a cheap inrunner, abd even without load the temperature rise was too quick to allow any real use. I was strongly suspecting the VFD, as cheap as the motor... but I never spend more time on it, I got a 24'000 rpm spindle that is OK (but way too slow to make fast routing) I'm right now waiting for a chinese spindle than must reach 60'000 rpm, will see, this shall give a big up to ma PCB routing speed. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On 22 February 2012 20:48, Kirk Wallace kwall...@wallacecompany.com wrote: I want to mount an outrunner (or other) to a NMTB40 tool holder to try some circuit board routing. Bear in mind that cooling might be inadequate without a huge propellor on the front, so expect to derate. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On Wed, 2012-02-22 at 16:18 -0500, Erik Friesen wrote: You could take a look at the marine applications (inrunners), there are some water cooled. What will your supply be? You'll want to decide what rpm you want to run, as the higher kv, the lower the torque. Are you going to belt drive, or direct drive some way? ... snip The supply will be whatever it needs to be. I don't think torque would be a problem because the etching bit will most likely be small at the tip. I suppose the RPM will need to be in the 100k range to get decent cutting feed rates? I have model car motor I used for drilling circuit boards which worked well. I want to mount the motor on axis with the tool holder and keep the overall length as short as possible. I was thinking about doing this a while back and I'm now beginning to remember some the issues I faced back then. I may have come to the conclusion that the outrunner was not ideal. I need to think about this some more. I think my last plan was for a backyard version of a Tormach speeder: http://www.tormach.com/product_pcnc_acc_speeder.html Thanks for the replies. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
You might want to check out this site: http://www.logicnc.com/home.html They have a parallel port to rc servo converter so LinuxCNC can control an outrunner spindle speed. Cheers, Jim -Original Message- From: Erik Friesen [mailto:e...@aercon.net] Sent: Wednesday, February 22, 2012 3:19 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Outrunners You could take a look at the marine applications (inrunners), there are some water cooled. What will your supply be? You'll want to decide what rpm you want to run, as the higher kv, the lower the torque. Are you going to belt drive, or direct drive some way? On Wed, Feb 22, 2012 at 3:58 PM, Claude Froidevaux men...@bluewin.chwrote: Le 22.02.2012 21:48, Kirk Wallace a écrit : I want to mount an outrunner (or other) to a NMTB40 tool holder to try some circuit board routing. I like the outrunner form because it looks like the motors seem shorter for the same power. I haven't flown model planes for over twenty years so I've lost my feel for sizes and capacities. Does anyone have any experience with outrunners for milling applications? I'm looking at getting a cheap motor to experiment with then build on the experience, so the motor will need to be in the disposable price range. for PCB routing, inrunner will be better, as you need as much speed as possible (40k to 100k rpm). I do some trials by the past with a cheap inrunner, abd even without load the temperature rise was too quick to allow any real use. I was strongly suspecting the VFD, as cheap as the motor... but I never spend more time on it, I got a 24'000 rpm spindle that is OK (but way too slow to make fast routing) I'm right now waiting for a chinese spindle than must reach 60'000 rpm, will see, this shall give a big up to ma PCB routing speed. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users This communication is for the use of the intended recipient only. It may contain information that is privileged and confidential. If you are not the intended recipient of this communication, the disclosure, copying, distribution or use hereof is prohibited. If you have received this communication in error, please advise me by return e-mail or by telephone and then delete it immediately. -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On Wed, 2012-02-22 at 16:02 -0600, James Louis wrote: You might want to check out this site: http://www.logicnc.com/home.html They have a parallel port to rc servo converter so LinuxCNC can control an outrunner spindle speed. Cheers, Jim This is what I've done with RC so far: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?RC_Servo_Test Probably good enough for spindle control. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Outrunners
On Wed, Feb 22, 2012 at 4:34 PM, andy pugh bodge...@gmail.com wrote: Bear in mind that cooling might be inadequate without a huge propellor on the front, so expect to derate. RC cars use inrunners with heat sinks, so air must not be an absolute requirement. Probably a good idea though Eric -- Virtualization Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
