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
[Emc-users] Spindle speed interfaces
Greetings all; The spindle controller in a 7x10-12-14 is quite a bit different from the one in my mill, so my question is: Can it be controlled by essentially the same controller (in this case a PMDX-106) as has worked so well on the mill? And if so, how hard is it in hal, to tie the encoder's output back into the speed logic in LinuxCNC? In a manner that looks like a constant SFM control even. 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) My web page: http://coyoteden.dyndns-free.com:85/gene I'll see you... on the dark side of the moon... -- Pink Floyd -- 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] Signing Off
I am heading off tomorrow to do a bit of sailing. I won't have any internet at all for 7 weeks. I will be back in April. -- 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] Signing Off
On Sat, 25 Feb 2012, andy pugh wrote: Date: Sat, 25 Feb 2012 00:49:58 + From: andy pugh bodge...@gmail.com Reply-To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Subject: [Emc-users] Signing Off I am heading off tomorrow to do a bit of sailing. I won't have any internet at all for 7 weeks. I will be back in April. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. Sounds wonderful, have a great time! Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your ()_() signature to help him gain world domination. -- 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] Signing Off
On Sat, 25 Feb 2012, andy pugh wrote: I am heading off tomorrow to do a bit of sailing. I won't have any internet at all for 7 weeks. I will be back in April. Could you please elaborate Are you sailing between planets, 7 weeks Being a land locked farm boy it sounds interesting Richard -- 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] Signing Off
On Sat, 2012-02-25 at 00:49 +, andy pugh wrote: I am heading off tomorrow to do a bit of sailing. I won't have any internet at all for 7 weeks. I will be back in April. I hope you have a great adventure. Bon voyage. -- 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
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] Signing Off
andy pugh wrote: I am heading off tomorrow to do a bit of sailing. I won't have any internet at all for 7 weeks. I will be back in April. Hope you are in the southern hemisphere, the weather in the northern is still a bit cool for me. Enjoy 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] Signing Off
On 2/24/2012 7:49 PM, andy pugh wrote: I am heading off tomorrow to do a bit of sailing. I won't have any internet at all for 7 weeks. I will be back in April. You consider that a bit of sailing!?!? Good Luck, keep the harness on, and stay warm. Dave -- 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] Mesa 5i25 with Generic stepper board
Here is a hand built XML file for 5i25 with prob_rfx2 firmware. You need to add the folder '5i25' to /lib/firmware/hm2 then add the XML file to that folder. You will need administer privileges to do this. one way is to open a terminal and typesudo nautilus and then your password. after that when you run PNCconf you will be able to select the 5i25 board and the prob_rfx2 firmware. Chris M From: chrisinnana...@hotmail.com To: emc-users@lists.sourceforge.net Subject: RE: [Emc-users] Mesa 5i25 with Generic stepper board Date: Thu, 23 Feb 2012 10:56:38 + I'm a bit shaky on how to configure this as I just started studying it last night, however it appears to me that if I created a prob_rfx2.xml file, that I could utilize pncconf to build my emc2 configuration. I have the prob_rfx2.pin file that describes all of the pins that the firmware defines. Am I on the right track here? Also are there any references or tips that anyone is aware of to help me along? I'm linux savvy and a programmer, so any work that could be reusable I'd like to share and provide for others that may follow down this path. I took a look at the firmware you quoted. Yes if you make an XML file PNCconf will help you configure it. I'll try to find time to build one this weekend. Chris M ?xml version=1.0? hostmot2 boardname5i25/boardname ioports2/ioports iowidth34/iowidth portwidth17/portwidth clocklow/clocklow clockhigh2/clockhigh modules module tagnameWatchdog/tagname numinstances1/numinstances /module module tagnameEncoder/tagname numinstances2/numinstances /module module tagnameStepGen/tagname numinstances8/numinstances /module module tagnamePWMGen/tagname numinstances2/numinstances /module module tagnameLED/tagname numinstances1/numinstances /module /modules pins pin connectorP3/connector secondarymodulenameNone/secondarymodulename secondaryfunctionname???/secondaryfunctionname /pin pin connectorP3/connector secondarymodulenamePWMGen/secondarymodulename secondaryfunctionnamePWM/Up (out)/secondaryfunctionname secondaryinstance0/secondaryinstance /pin pin connectorP3/connector secondarymodulenameStepGen/secondarymodulename secondaryfunctionnameStep (out)/secondaryfunctionname secondaryinstance0/secondaryinstance /pin pin connectorP3/connector secondarymodulenameNone/secondarymodulename secondaryfunctionname???/secondaryfunctionname /pin pin connectorP3/connector secondarymodulenameStepGen/secondarymodulename secondaryfunctionnameDir (out)/secondaryfunctionname secondaryinstance0/secondaryinstance /pin pin connectorP3/connector secondarymodulenamePWMGen/secondarymodulename secondaryfunctionnameDir/Down (out)/secondaryfunctionname secondaryinstance0/secondaryinstance /pin pin connectorP3/connector secondarymodulenameStepGen/secondarymodulename secondaryfunctionnameStep (out)/secondaryfunctionname secondaryinstance1/secondaryinstance /pin pin connectorP3/connector secondarymodulenameNone/secondarymodulename secondaryfunctionname???/secondaryfunctionname /pin pin connectorP3/connector secondarymodulenameStepGen/secondarymodulename secondaryfunctionnameDir (out)/secondaryfunctionname secondaryinstance1/secondaryinstance /pin pin connectorP3/connector secondarymodulenameStepGen/secondarymodulename secondaryfunctionnameStep (out)/secondaryfunctionname secondaryinstance2/secondaryinstance /pin pin connectorP3/connector secondarymodulenameStepGen/secondarymodulename secondaryfunctionnameDir (out)/secondaryfunctionname secondaryinstance2/secondaryinstance /pin pin connectorP3/connector secondarymodulenameStepGen/secondarymodulename secondaryfunctionnameStep (out)/secondaryfunctionname secondaryinstance3/secondaryinstance /pin pin connectorP3/connector secondarymodulenameStepGen/secondarymodulename secondaryfunctionnameDir (out)/secondaryfunctionname secondaryinstance3/secondaryinstance /pin
Re: [Emc-users] Brass finish question?
sulfuic acid (battery acid) wont eat copper. might make a matte surface on brass. then, if silver blackens better than copper, so might a silver plating applied over matte copper/brass. http://www.swdinc.com/black_oxide.htm if you have a tin can and a pressure cooker. --- On Thu, 2/23/12, gene heskett ghesk...@wdtv.com wrote: From: gene heskett ghesk...@wdtv.com Subject: Re: [Emc-users] Brass finish question? To: emc-users@lists.sourceforge.net Date: Thursday, February 23, 2012, 5:28 AM On Thursday, February 23, 2012 08:25:14 AM Mark Wendt did opine: On 02/22/2012 04:23 PM, gene heskett wrote: On Wednesday, February 22, 2012 04:22:08 PM Greg Bernard did opine: There are numerous solutions that work, the most common being liver of sulfur (I don't remember what the modern name is). The easiest would be the stuff by Birchwood-Casey which should be available at any good gunsmith shop. That, or the G96 clone, is what I'll go shopping for tonight. Thanks. Cheers, Gene Walmart has Birchwood Caseys Brass Black in the sporting goods section by the gun counter. Mark 2nd choice, I'll check at the local pharmacy's for K2S first, aka liver of sulpher. I have seen that work on silver, and the finish is fairly durable. Thanks Mark. 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) My web page: http://coyoteden.dyndns-free.com:85/gene I know you believe you understand what you think this fortune says, but I'm not sure you realize that what you are reading is not what it means. -- 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] Film Emulsion for Encoder Wheels?
I wonder if one could make an encoder wheel with a thin glass disk, coat it with a film emulsion, expose it to an image of an encoder wheel, and develop it like regular film? Or, use a thin sheet metal disk with photoresist and etch the slots? I know these techniques are use commercially, I'm just wondering if one of us shed based folks might be able to pull it off. -- 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
