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Re: MotionMaster Gantry Router
D.F.S.
Hey, That thing should be able to build the shop for itself ;-). The way I see it, the physical machine, the lead screws or other linear motion mechanism is the hard part. Don't sweat the motors or even encoders much, even if you have to replace them all, you are well on your way to a killer machine, IMHO. Marc |
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Larken amps
Harrison, Doug
I have been studying the Larken website and am interested in their stepper
drivers. They have a model that is rated for 4-8 amps at 50V and sells for $199. It has quarter stepping, idle cutback and (supposedly) easily replaceable FET's. Sounds pretty good. Has anyone used these, and if so, what's your opinion? Having been burned with Microkinetics, I tend to be careful these days. My other concern is whether these amps will drive the OEM motors on a Bridgeport. The L/R system of the old BOSS-5 was set up at about 90V and 8A. Has anyone tried running the Bridgeport step motors at 50V or less? Doug Harrison |
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MotionMaster Gantry Router
John Ross
Wow as of this morning it looks like I'm the new owner of one beast of a
gantry router. 114" x 60" bed and 7,000 Lb. The Fadal controller is burned up along with the z axis motors. Looks like a candidate for a PC/EMC conversion. Does anyone know what kind of motors MotionMaster uses? I should probably ding one out of the gantry and look for a label or something. Now I just need to convince the wife I need to build a bigger shop. John Ross |
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Re: Austrailian bipolar driver Kits
Darrell
I remember the instructions had a value in amps that was the limit before
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you needed heat sinks. I think heat sinks were only required above 2 amps. I am working with Bridgeport CNCs and they have about 80 volt power supplies and the motors draw 8 amps. Darrell ----- Original Message -----
From: Joe Vicars <jvicars@...> To: <CAD_CAM_EDM_DRO@...>; <dgehlsen@...> Sent: Monday, March 06, 2000 2:42 PM Subject: Re: [CAD_CAM_EDM_DRO] Austrailian bipolar driver Kits From: Joe Vicars <jvicars@...>discussion of shop built systems in the above catagories. To Unsubscribe, read archives, change to or from digest. |
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Re: Austrailian bipolar driver Kits
In a message dated 06-March-00 15:40:28 Central Standard Time,
jvicars@... writes: << From: Joe Vicars <jvicars@...> Any idea what it's good for? 1.5 A per phase? >> Not sure of the "complete question", so, here's at least a "partial answer": See the ST L298 "dual full-bridge driver" which is a "multiwatt" package (kinda like a wide t0-218 with 15 leads). |
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Re: Austrailian bipolar driver Kits
Darrell
Joe,
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I bought one of the Oatley single axis boards on the claim of 80+ volts and 10+ amps. When I asked them for specific instructions on how to set things up for 8 amps using an 80 volt power supply they said it would take major modifications and offered to take the kit back for a full refund. It looks like you have to replace all of the MOSSFETS, add heat sinks to everything that carries any current and the amperage is controlled by resistors (it is not a chopper driver) so you need some high watt resistors with heat sinks. For small motors, it looked like an ok board. Darrell ----- Original Message -----
From: Joe Vicars <jvicars@...> To: <CAD_CAM_EDM_DRO@...>; <diazden@...> Sent: Monday, March 06, 2000 6:43 AM Subject: [CAD_CAM_EDM_DRO] Austrailian bipolar driver Kits From: Joe Vicars <jvicars@...>discussion of shop built systems in the above catagories. To Unsubscribe, read archives, change to or from digest. |
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Re: Version 2.2.* EMC
George Fouse
Hi Ian,
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1. I'm a little confused ... when the install script makes the directory emc, I think the only directories it creates in the secondary directory "emc/plat" is "java", "linux_2_2_13", and "rtlinux_2_0". Did you have the directory "emc" around from an earlier version? To avoid confusion, uncompress and untar the download in its own (fresh) directory. 2. "install_rtlinux_base" is the name of the script to install the required rtlinux modules - was "install_rtl_base" a typo? For our purposes, we could just use the 5 line script: /sbin/insmod rtl_time /sbin/insmod rtl_sched /sbin/insmod posixio /sbin/insmod rtl_fifo /sbin/insmod mbuff If all your rtlinux demos work ok, then the modules should be functional. 3. It REALLY sounds as if you aren't getting a success build during execution of the install script. Did you generate a log file when running ./install [./install &> logfile]? Scan that, looking specifically for any errors, undefined references, etc. Also make sure that the flags in rcslib/etc/rtlinux_2_0.def are compatable with your kernel and your file structure. for example - did you enable smp on your kernel build [CFLAGS defines __SMP__ ,which will generate unresolved references in a non-smp kernel]? And note that the .def file actually defines the rtlinux include path as "/usr/src/rtlinux-2.0/rtl/include". You might need to change that to match you directory tree (or modify your tree with some symlinks). But you really need to scan your install log - messages fly by on the screen too fast to be useful. Good luck. George Ian Wright wrote: Hi, George, --
------------------------------- George Fouse, President G F I Consulting ------------------------------- |
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Austrailian bipolar driver Kits
I bought the K109 two axis driver kit. I am assuming it runs on
step/dir based on the description of the K142 (the two are supposed to be very similar) I will let everyone know how it goes together. I was a little skeptical about the 14 amp claim myself and I am wondering what needs to be heatsink-ed and how much? Just the switching FET's ? I have zero board building experience so the probability of frying this board is high I am afraid. If I send out the circut diagram and component list would that be worthwhile? Should I get permission from Oatley? Mariano, is there any way you can get me an email copy of the article on the Oatley boards you mentioned? |
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removing encoders from motor shaft
I have the same problem Terry described removing delicate glass
encoder wheels from old plotter servo motors. I successfully removed one that was already broken by gently prying it off with a little stanley nail puller. It takes a little pressure to break the RTV-type adhesive, but once you get it going it comes off smooth. It is very dicey however, the encoders on the ones I have are only .007" thick. I think there is a better way. I am going to make a wedge type tool to remove the other encoders, like a Jacobs taper chuck key. Looks like a little horseshoe with shallow ramps on both sides. Good luck. |
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Homebrew STG card - Electronics Australia
Doug Fortune
m.d.c wrote:
From: "m.d.c" <diazden@...>I just went to Electronics Australia website, and they seem to haveyes; I have made about 4 or five of them, I and they are very goodFrom: Joe Vicars <jvicars@...> all kinds of projects. Presumably they always need more material for their magazine. Perhaps their people will design a board to our I/O specs. A win-win situation, as we will get a board design and publicity for EMC, and they will full pages. If not them, then maybe Nuts & Volts, or Popular Electronics, or ... Doug |
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Australian Oatley 14 Amp/axis kit
Doug Fortune
It sounds like you got two of the two-axis per card units. Does that implyFrom: Joe Vicars <jvicars@...> its parallelport to phase output, or Step & Direction? Mariano "m.d.c" <diazden@...> wrote yes; I have made about 4 or five of them, I and they are very good Mariano: Which ones did you get? : (K142) $45 per axis kit. or the dual driver PCB & all on-board components kit: (K109) $40 Their K142 with a 5V to 100V 2 Amp to 14 Amp kit must be either a typo or a Mother of a setup. Assuming its the K142 you guys bought, does it take Step & Direction? Half or Micro stepper? Does it work well with EMC? Dimensions? Always hungry for details.... Doug |
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Re: release9j.tgz
Jan
Thanks Dan.
Jan, I just put a copy of release9J.tgz in the dropbox at linuxcnc.org. I will put a copy of the rtlinux source for 2.2.13 asap too. Dan At 06:50 PM 3/5/00 +0100, you wrote: >From: "Jan" <postmaster@...> > >Hello all, > >Can anyone point me where I can download the release9J.tgz file, as I can't find it in the ftp-directory of EMC. > >Thanks in advance. > >Jan. > ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems in the above catagories. To Unsubscribe, read archives, change to or from digest. Go to: Log on, and you will go to Member Center, and you can make changes there. For the FAQ, go to bill, List Manager |
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Re: release9j.tgz
Dan Falck
Jan,
I just put a copy of release9J.tgz in the dropbox at linuxcnc.org. I will put a copy of the rtlinux source for 2.2.13 asap too. Dan At 06:50 PM 3/5/00 +0100, you wrote: From: "Jan" <postmaster@...>can't find it in the ftp-directory of EMC.
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Re: DRO UPDATE
Terry May
Art,
Here I am again asking questions... How did you get the encoder wheel off of the motor shaft? I got the retaining ring off without destroying the disc but can't seem to get the disc off the shaft. It appears to be bonded to the aluminum disk underneath it and that acts like it is a press fit on the shaft. I hesitate to apply too much force trying to pry it off but am looking for clues. On the other hand I have a bunch of small plastic pulleys with ball bearing centers that came out of the plotter that yielded the cable I plan to use. Since they have an ID enough larger than 5mm that I think I can bush them to fit the encoder shafts, I plan to use those to run the cable over, seems like they would be less likely to have any slippage since HP designed them to be used with the cable. Does this sound reasonable to anyone, just looking for ideas. Thanks Terry --- In CAD_CAM_EDM_DRO@..., "A. G. Eckstein" <axtein@s...> wrote: Ward,nyx.net/~slindsay/dro.html give them a try as well.OLDER THAN DIRT |
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