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Re: Servo Motors
Robert Neidorff
Those Indiana General tape drive motors are VERY NICE DC brush motors.
They are very well made and durable. However, as previously said, they are low horsepower. I have one which I got surplus. I ran it from a bench variable supply to see what it would do. I put as much as +60V on it and got it up to over 1500 RPM. With a belt speed reduction 5:1 or 10:1, it should have enough torque to move a Bridgeport table, but surely not direct drive. -- Bob Neidorff |
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Re: 10 amps to drive steppers
Dan Mauch
I used an A/C fan that comes on as soon as the power comes up. That way if
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the thermal switch should trip the fan continues to run. The only problem with this set up is that once it shuts down then when it cools off it starts running the axis again . Dan -----Original Message-----
From: Tim Goldstein <timg@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Monday, June 14, 1999 7:33 AM Subject: Re: [CAD_CAM_EDM_DRO] 10 amps to drive steppers From: "Tim Goldstein" <timg@...>wiring the fans off the incoming power ahead of the thermal cut-off device.line. aboutDan discussion of shop built systems in the above catagories.discussion of shop built systems in the above catagories.wired$1.30 ea.Dan, To Unsubscribe: |
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Re: 10 amps to drive steppers
"Mo" <[email protected]
Any of you guys integrating hi power stepper drive units such as Dans or
others with custom power supplies, should consider 2 areas of disconnection which will cause problems, 1 Driver board driving the phases without a motor connected - can happen inadvertantly - I've been there 2 Reconnecting a driver board with the motor voltage present - the high value smoothing capacitor(s) on your power supply is charged to the full supply voltage and carries a serious amount of charge - unless you take action to get rid of it it will stay charged for a very long time. Both of these situations seriously endanger your valuable boards. To protect against the driver driving without a motor connected, a good idea is to use a plug and socket connection for the motor with a couple of pins more than you need - so if you need 4 pins for your 4 wire motor get a 6pin plug and socket. Use the 2 unused pins as a loopback - shorting them together in the plug which is connected to the motor and the socket which is mounted on the case can then use this short to enable the board. You could have your DC supply voltage going into the socket via one pin, looping back in thro the plug when it is connected and then taken from the second pin of the socket and sent to your board, no motor connected = no DC voltage to board....the boards I use have an output inhibit pin which must be held low 0v for the board to drive the motors - a high or no connection will disable the boaard from driving. I use the above method to feed a ground wire into the socket that then loops back via the motor plug and then back onto that pin. With the other issue of main motor suopply capacitors remaining charged after switch off, you should use a bleed resistor connected across the motor supply voltage - eg across the capacitor (s). The trick here is to get a value of resistor which is low enough to allow the capacitor to discharge quickly thro it but without drawing too much current from the capacitors and getting too hot. I use a 70v supply and a 2.2k resistor gives me about a 30 second disharge time - 2 in series (4.4k) gives about a minute. The amount of current tro the 2.2k = 70/2200 = 30mA which i can afford to waste. But when we calculate the wattage of the resistor it shows 70v x 0.03A = 2.1W that is a big ceramic covered resistor and 2w is hot - very hot, it will burn you if you touch it. Also if you shed 2w you need the resistor to be double that for reliablity e.g a 4watt. So I use 2 2.2k 2watt resistors in series to give 4.4k and it takes a minute to disharge the cap, the current tro is halved to 0.015A therfor the total power dissipation is also halved to 1W. Now I have less heat, more reliability and less current waste and a minute is enough. Be warned, these reistors still get hot so should be kept away from heat sensitive stuff and in the cooling path. Mo |
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Re: 10 amps to drive steppers
Tim Goldstein
Dan,
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That is what I thought you were indicating, but I just wanted to be sure. Seems to me that I would want the fans to keep running after a thermal shutdown to help the temperatures get back down. So, guess that means wiring the fans off the incoming power ahead of the thermal cut-off device. Thanks, Tim [Denver, CO] ----- Original Message -----
From: Dan Mauch <dmauch@...> To: <CAD_CAM_EDM_DRO@...> Sent: Monday, June 14, 1999 7:18 AM Subject: Re: [CAD_CAM_EDM_DRO] 10 amps to drive steppers From: "Dan Mauch" <dmauch@...>discussion of shop built systems in the above catagories. To Unsubscribe: |
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Re: Past items????
Dan Mauch
I will have the hardware sherline retorfit kits this week about thursday. I
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have bandsawed about 40 plate and machined all the blanks to the proper width. I just need to machine the 1" bore and drill the holes. Dan -----Original Message-----
From: WAnliker@... <WAnliker@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Sunday, June 13, 1999 12:08 PM Subject: [CAD_CAM_EDM_DRO] Past items???? From: WAnliker@...I was wondering about the status of the work on it. If my memory is wrongdiscussion of shop built systems in the above catagories. To Unsubscribe: |
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Re: 10 amps to drive steppers
Dan Mauch
The +36 supply to the 5 amp controller. Or if you used +24 then that line.
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Dan -----Original Message-----
From: Tim Goldstein <timg@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Sunday, June 13, 1999 9:48 AM Subject: Re: [CAD_CAM_EDM_DRO] 10 amps to drive steppers From: "Tim Goldstein" <timg@...>hot-----Original Message----- wiredclimates like india, I included some thermal cutoff switches. I simplyDan, them into the Vin to the controller."?discussion of shop built systems in the above catagories. To Unsubscribe: |
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Re: EMC C Code
From mshaver@... Mon Jun 14 03:26:23 1999CAD_CAM_EDM_DRO-owner@... Delivered-To: mailing list CAD_CAM_EDM_DRO@...It shouldn't really be called "write once,run anywhere". It should be " write once, test everywhere, work around the bugs, run anywhere". But I still think it is easier to get graphical programs written in Java to run on multiple platfroms than C++ programs. Having xemc run on an NT platform for instance either requires installing an X server on NT and I don't know of one that's free or rewriting it to use the Win32 or MFC interfaces which would be almost as bad as starting from scratch. To intercept keyboard input. Add "implements keyListener" to your applet class. In either init() or the constructor add addKeyListener(this); and three functions to your applet class. public void keyPressed(KeyEvent evt) public void keyReleased(KeyEvent evt) public void keyTyped(KeyEvent evt) There is another problem that you need to be aware of. If you hold down a key for several seconds. Instead of just a single keyPressed after a few seconds you may get a keyReleased even though you didn't release the key followed quickly by another keyPressed. Fred solved this in xemc by ignoring the equivalent of key released for a few milliseconds so you wouldn't get jerky starts and stops while holding the jog key. I think the same thing would probably work in Java. Also, would you mind making the source code publically available? I think I might modify it to make a few commands and status fields actually connect to the EMC and repost it hoping someone else would finish the job. -- Will ------------------------------------------------------------------------of shop built systems in the above catagories. To Unsubscribe: |
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Re: Past items????
In a message dated 6/14/99 6:25:10 AM Pacific Daylight Time,
dmauch@... writes: I should also asked you the price, and what is included. Visited your web site yesterday noticed you now have servo drivers, maybe next time I will go that route, but this time will do steppers on my EMCO FB-2 mill. bill List Manager |
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Re: Past items????
In a message dated 6/14/99 6:30:36 AM Pacific Daylight Time,
TADGUNINC@... writes: Log in on ONELINE, and go to member center, and click on the CAD_CAM_EDM_DRO list, that will take you to the list center, and click on archives. Or just enter the following URL: good luck, bill list manager |
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Re: EMC C Code
Well I left myself open for that hair splitter. I was wondering if somebody was going to jump on it. You did notice I said 'running OS'? Perhaps 'grafted' was a poor choice of words, considering the implementation. And really, the implementation details are not important in this context. Once you load the RT extensions, you have a RT OS and it wouldn't matter to an application if you were emulating the whole thing on a virtual CPU. The important point is that these are capabilities provided by the OS (whether Linux+RT or NT+RT) and cannot be emulated or supplied by the application. Which, getting back to the original point, is the reason code written in C or C++, which is rumoured to be portable, may not be portable to specific platforms (e.g. Win95 et al) since they lack the underlying facilities required by the code to operate, even though compilers may be available. -- Paul Amaranth | Rochester MI, USA Aurora Group, Inc. | Software Development paul@... | Unix / C / Tcl-Tk |
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Re: EMC C Code
Matt Shaver
From: Jon Elson <jmelson@...>Having played with it enough to write this program, I'd have to say that the promise of "write once, run anywhere" was considerably overstated. It ran great in Applet Viewer. which is the utility that comes with Java Development Kit (JDK) you are supposed to use to test your applets with. It also, oddly enough, worked great in IE. I've seen it run OK in the Windows version of Netscape, but act weird in Netscape on Linux and SunOS. The Advanced Windowing Toolkit (AWT) comes with a Button object, but it only supports ButtonDown events, not ButtonUp. I need ButtonUp for the jog buttons so I had to create a whole new class of button I called TextButton that had the features (called methods in Javaspeak) I needed. I also never figured out how to add support for keyboard KeyUp/KeyDown events which are all but required (I'll bet Jon would be less than enthusiastic about a mouse-only GUI for the EMC!). Matt |
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Re: EMC C Code
Jon Elson
paul@... wrote:
Well, not exactly. The real time patch for Linux isn't really part of theFrom: "Robert N. Ash" <esccmail@...>The Java program did not do real time machine control. operating system. the only OS feature that it really uses is the ability to have loadable modules which run at kernel priority. This is mostly used for loadable device drivers. What the real time code does is build an entire new real-time environment underneath the operating system, and allow the entire Linux system to run as one of the real-time processes, although the lowest on the priority list. Other real-time processes can be created, but they run pretty much OUTSIDE Linux. They have no ability to allocate/free memory, do I/O, or any of the things Linux programs usually are able to do. All communication with the rest of Linux and user programs is through a shared memory area which is created by telling the Linux boot loader program LILO to leave a chunk of memory unused at the top of the system memory. The real time patch has functions to create memory windows and fifos in this area. So, in fact, the real time feature WAS grafted on later to Linux. It was only possible, of course, because the source to the Linux kernel is available to anyone who wants to read it (or change it). The real time extensions to Windows NT was done in a very similar way, but Microsoft charged the outfit that created it a bunch to see what they needed to change, and they then have to charge the customer to cover this cost. Jon |
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Re: EMC C Code
Jon Elson
"Robert N. Ash" wrote:
From: "Robert N. Ash" <esccmail@...>No, the whole EMC package is not run in Java, only a section of the user interface. Java, as far as I know, has no features to deal with real time processing. As long as the program it is talking to has the real time stuff working, then it would be OK, but the Java component has no knowledge of it. Now, the trick is that the Java interface can run on a different computer. But, then, the X-windows interface (Xemc) could run on another computer, too, and it is almost as portable as Java. Jon |
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Re: Newbee, Laser Machining Anyone?
Don Hughes
Although my applications are mostly related to developing micro radio andMario: I am in the process right now of amassing all my parts to build a 24 x 48 table with a CO2 laser head on it. What I am toying with is, do I want to buy my laser head commercially and pay about $6000.00 for it, or build it from scratch myself as a "flowing gas" laser at 1/4 the cost. I am still searching out some answers to questions, but yes, at least one person is doing this in the group here. I am also building from scratch a mini-mill to machine wax and wood plugs for forming parts. Regards, Don Hughes Vancouver, BC Canada |
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Re: NESTER/Lathe??
Charles Gallo
Bill,
At this time, stepster does not support a lathe Charlie At 06:45 PM 6/13/99 EDT, you wrote: From: WAnliker@...discussion of shop built systems in the above catagories. To Unsubscribe:PGP Key Avalible upon request |
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Re: Past items????
Charles Gallo
The pin numbers can be set in the config file, so that's no problem!
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Kevin's code just wasn't reading the right register, and then was assuming a pin, even though there was a setting, and even then, was doing the check incorrectly. I need maybe 1/2 hr to 1 hr to fix it, and then I need to send it out for alpha test. I made a LOT of changes, and I'm almost sure I broke something or another Charlie At 06:20 PM 6/13/99 EDT, you wrote:
<snip> It has Home and Limit switches, any chance that STEPSTER can support the<snip> PGP Key Avalible upon request |
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Re: Newbee, Laser Machining Anyone?
Tim Goldstein
Hey Mario,
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Glad to see you on the list. I follow your postings to the Slow Fly Radio Control list quite closely. I just love your micro helicopters. Tim [Denver, CO] -----Original Message----- |
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Re: electrical help needed: kinda ot
Steve Gunsel
You have 220 vac - 3 PHASE power available? Or is the motor converted to
single phase? You can run 220 vac single phase power through a transformer and get 440 vac - SINGLE PHASE. You can't get THREE PHASE power from SINGLE PHASE without a "phase converter". At 09:32 PM 6/14/99 -0500, you wrote: From: mike grady <mgrady@...>110(DC) hardinge is tring to find a wiring diagram, they said not to hold mybreath. thats why they said a step up transformer from 220 to 440 would be the way to go just hook it up 440v 3 ph of rewiring the control boxhardinge recommended using a transformer to convert it to 220 instead hopefully cheapon 440 it uses no more than 4 amps where can i get a transformer, It mite get converted to cnc but I have to get it running first |
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