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New file uploaded to CAD_CAM_EDM_DRO
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the CAD_CAM_EDM_DRO group. File : /StepperCalcs.xls Uploaded by : alenz2002 <alenz@...> Description : You can access this file at the URL To learn more about file sharing for your group, please visit Regards, alenz2002 <alenz@...> |
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Re: Refitting a Lynx
hllrsr@... wrote:
Guys,You need to find out what feedback devices are on the servo motors. If they have both encoders and tachometers, then almost any servo amp (Westamp, Servo Dynamics, Kollmorgen, Copley Controls) should work. Assuming these are brush motors, you need amps that will drive that motor type. If no tachometers are fitted, that narrows the choice a bit. Geckos will work if you want to use a stepper-oriented CNC program. But, you get a bit more flexibilty using a program that accepts encoder feedback, such as DRO-like operation when the servo amps are off, and sensing of position error when they are on. Jon |
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Re: AutoCAD compatibility
qwerty12345612
Have you tried right clicking on the setup program for AutoCAD and
running it in compatability mode(under "properties" after right clicking)? its worked for me a bunch of times when I tried to install a stubborn program that didnt want to install on XP, giving me the old "Not a compatable OS"error dialog. --- In CAD_CAM_EDM_DRO@y..., "Zafar Salam" <info@s...> wrote: With XP you can run AutoCAD 2000iMach1. AutoCADThe problem with this is that now I can't install my copy of Is2000 (educational version). It says that XP is an "invalid OS". appreciatedthere any way I can get around that? Any help would be
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Re: G-Code Examples
Mr.G
Here's a site that gives you the some info on
RS-274D, which is the standard for most numerically controlled machines Hope this helps --- B Snowden <bsnowde@...> wrote: Can anyone point me towards Books or web sites that __________________________________________________ Do you Yahoo!? HotJobs - Search new jobs daily now |
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Re: Polar Coordinate based CNC
Lee:
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I've been doing some preliminary work on this, and it's like a lot of engineering problems in that optimizing for one variable makes another one squirt out. But there's some promise there. The big advantages are that only rotary joints are required, and that the load paths can usually be shorter (not in all cases though). The chips stay out of the motion stuff as a bonus. The big drawback is that since the coordinated motion to generate a +1" move in X (say), changes depending on where you are on the table - the machine must be initially calibrated to some absolute angles. This is the Achilles Heel, since the degree of precision required to do that is pretty sobering. No insurmountable problems, but at the end of the day it seems easier just to get along with the good old prismatic joints. So nice and linear. Someday I'll get around to building a prototype to test the idea. As another poster pointed out, it puts the metal where it counts to build the work envelope. Dave Kowalczyk Everett WA TurboCNC software --> ----------From: Lee Wenger <wenger2k@y...>be based on a polar coordinate system rather than a |
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Re: Stepper motor speeds
Marv Frankel
Tim,
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I presently have no $ invested in any equipment other than the mill. Why would the servo/G320 scenario be better for me. Marv Frankel ----- Original Message -----
From: "Tim Goldstein" <timg@...> To: <CAD_CAM_EDM_DRO@...> Sent: Sunday, November 03, 2002 6:20 PM Subject: RE: [CAD_CAM_EDM_DRO] Re: Stepper motor speeds Sounds like I was thinking of someone else's project. Seems to me theaol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Re: Stepper motor speeds
Carol & Jerry Jankura
Hi, Brian:
No, I'm using the $160 three axis driver kit. This uses LS297/298 chips. I'm running in 1/2 step mode (i.e. the steppers are 200 steps/rev but is being run at 400 steps/rev). -- Jerry |At 8:13 PM -0500 11-03-02, Carol & Jerry Jankura wrote: |>I'm running TurboCNC into Camtronics 2 amp drivers into |Sherline's 100 oz-in |>motors. The power supply is a 24vdc regulated supply that's turned up to |>around 26->28 volts. I get 4500 sps on X and Z and 2600 on Y. | |Jerry- | |Very good! Is this the $400 driver on their website? Do you know what |driver chips are used? | |Are you using full, half, 1/4, or 1/8 step mode? |
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Re: AutoCAD compatibility
Marv Frankel
Seth,
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If you have enough space on the hard drive, you might consider creating a dual-boot computer, or call AutoDesk tech support, and ask for a solution. Marv Frankel Los Angeles ----- Original Message -----
From: "dgmachinist" <scsm@...> To: <CAD_CAM_EDM_DRO@...> Sent: Sunday, November 03, 2002 5:09 PM Subject: [CAD_CAM_EDM_DRO] AutoCAD compatibility Hi all,aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Re: Flashcut
Matt Shaver
On Sunday 03 November 2002 07:12 pm, you wrote:
It does seem that users of Flashcut rave about it. I also have not quiteI think you have it figured out... It's expensive, it must be good! Matt |
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Re: Stepper motor speeds
B Snowden
Bryan,
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I wanted to point out something I found out about voltage. I am running CamTronics board with the L298 driver, driving 23 frame motors at 90oz. I have a Power Supply that was feeding 38v into the steppers. Had a problem with missing steps on my y axis. I decided that I was getting too much feedback inductance when the motors were slowing down, causing a lost of steps. It took some observation to see the motor skip only when slowing down. I lowered the voltage to 33v and was able to gain control of my y axis. I am unable to provide you with a max on my motor speed, as I am still testing and have not tried to set the speed to the max. Bruce Bryan Mumford wrote: My motors are rated for 3.2 volts at 2 amps, driven with 24 volt choppers. |
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Re: Stepper motor speeds
Shelbyville Design & Signworks
nema 34 stepper, running with gecko's, running 10:1 reduction reliable at
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200 ipm (scary, but reliable) so 200 ipm /3.9 (30 tooth 24 d.p. pinion) *10 =500 +- rpm, moving a 800+ lb gantry. Erie Patsellis Shelbyville Design & Signworks 1309 W. S. 7th Street Shelbyville, IL 62565 (217)774-4444 visit our website at www.shelbyvilledesign.com ----- Original Message -----
From: "Tim Goldstein" <timg@...> To: <CAD_CAM_EDM_DRO@...> Sent: Sunday, November 03, 2002 8:11 PM Subject: RE: [CAD_CAM_EDM_DRO] Re: Stepper motor speeds aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Re: AutoCAD compatibility
Zafar Salam
With XP you can run AutoCAD 2000i
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Zafar Hi all, |
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Re: Stepper motor speeds
Sounds like I was thinking of someone else's project. Seems to me the
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sizes I have heard used successfully with a mill that size is 800+ in/oz. I would probably want to use about an 1100 in/oz motor or bigger. Definitely in the range where if you don't have money invested in motors or drives you are likely to get by for less and get better performance by going with servos and Gecko G320/340 drives. Tim [Denver, CO] -----Original Message----- |
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Re: Stepper motor speeds
The new Camtronics drive is built on the new Allegro 3977 chip.
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Tim [Denver CO] -----Original Message-----
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Re: Stepper motor speeds
Bryan,
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The motors are higher voltage than ideal if your goal is high speed. They will sure make a workable setup, just not the fastest on the block. I agree with you that virtually all the low cost drives are limited to a low voltage. I am currently running 8000 steps/second on my Sherline and am far from being at the maximum it is capable of. I tried it at 10000 steps/second and that seemed fine, but a little much for the little machine. My set-up at the moment is API CMD-260 drives running at 55 v with Pacific Scientific PowerMax II motors wired in bipolar series. I don't have a voltage on the motors, but would guess they are in the low 2 v range. Just like with cars the question is how fast can you afford to go. Higher voltage will do the trick, but you have to throw money at it for drive that will run the higher voltage. Tim [Denver CO] -----Original Message-----I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner |
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Re: Polar Coordinates CNC?
Fred Smith
--- In CAD_CAM_EDM_DRO@y..., Ray Henry <rehenry@u...> wrote:
along that vector so in effect it is a polar move. I can't for thelife of me see how specifying three angles and a distance would be moremilling or turning.It's the machine that is simpler. Think of a turntable (like a lazy susan) with the part mounted in place on the turntable. The rotation is C axis Now place a single horizontal linear axis parallel to the face of the turntable (X) above the work piece, and mount a Vertical Z axis onto the X. (R is not a valid CNC linear axis so I will refer to it as X.) The machine is simplified to a single linear X and a bearing for C. Instead of at least 4 precision linear guide components for a linear gantry style machine, you reduce it to 2 (shortest possible) plus the bearing (Actually only 1 if you use a dove tail arrangement like a Bishop-Wisecarver rail). The Z axis is the same mechanism in this case. The intriguing part is how to accurately position the work piece because there are no straight edges to indicate, away from the central X axis. I'm thinking of mounting a vise. How to indicate it in, is a much different thought process if only one horizontal axis is linear. I guess you could indicate one face, set zero degrees, rotate 180 degrees and tram for centrality, or rotate 90 degrees and use an edge finder to set the X distance and angle to a part edge. I would guess that you would want to have an axis transform for the vise to avoid going nuts trying to mount it square to the X axis. Logically it's the same as setting X & Y, but it's still a mind twister. Fred Smith - IMService |
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Re: Stepper motor speeds
Bryan Mumford
At 8:13 PM -0500 11-03-02, Carol & Jerry Jankura wrote:
I'm running TurboCNC into Camtronics 2 amp drivers into Sherline's 100 oz-inJerry- Very good! Is this the $400 driver on their website? Do you know what driver chips are used? Are you using full, half, 1/4, or 1/8 step mode? -- Bryan Mumford Santa Barbara, California |
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Re: (unknown) g43-44
Ray Henry
Tim
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I seem to recall something about there being a difference in the function of these g-codes on this side of the pond from the way that they are used on the other side. Ray ? ?From: "Tim Goldstein" <timg@...> |
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