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Steve Gunsel
OK, I've got the mill drill, a 9" SB lathe, computers (mostly old but
probably plenty good for this), and the software appears to be available. I guess the next step is to locate some suitable stepper motors and then build mechanical mounts and the electrical motor drive units. Questions: Just how big of a stepper motor is really needed (x, y, z, cross feed, etc.)? Where can the stepper motors be obtained at a reasonable price? Are servos preferred? If so, where can servos be obtained? Actually, I think the biggest question is how to find the time to play more with this stuff. Thanks. BTW this is one of the best forums I have ever seen! |
If you look hard enough, you can get lucky. If you're in a hurry, you can spend $$$. I got four or five huge steppers for $5 ea from a shop that was clearing out a lot of "junk". I bought a pallet(!) of printers from a school auction for $25. I salvaged a whole box of useful parts out of that (including gears, belts, guide rods, driver parts and power supplies on top of the steppers themselves). I still have a dozen printers sitting on the queue for dismantling, just no time for it. Actually, I think the biggest question is how to find the time to play moreYeah, that's the biggest problem I have. I have too many projects ahead of it, but I want to build a PCB mill to make printed circuit boards without using etchant. This should be a really neat project, but I don't see even getting to a starting point for at least 6 or 7 months.. Then there's the DRO for the lathe based on an 8051 microcontroller driving a small LCD screen. PCs are ok, available and cheap, but they take up a little too much room in my shop for my tastes. And then there's the SFM readout for my vertical bandsaw based on a PIC microcontroller. -- Paul Amaranth | Rochester MI, USA Aurora Group, Inc. | Software Development paul@... | Unix / C / Tcl-Tk |
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Jon Elson
Steve Gunsel wrote:
From: Steve Gunsel <gunsel@...>Well, as a bit of a pioneer in this area (for home shop use) I might just be a bit biased. But, I think they are worth the effort (and cost). The advantage is that you can have just about infinite resolution (limited only by the cost of whatever encoders you can come up with) with no affect on maximum rapid feed rate. You don't have to worry about losing steps. Even if the machine crashes, or binds up, it won't lose position, it will declare a fault and stop. If so, where can servos be obtained?Well, the motors themselves are everywhere. They are used in all sorts of machinery, but some of the best motors for Bridgeport-size applications are from 1/2" mag tape drive reel motors. The direct-drive reel motors are optimized for high torque at low speeds, just what we need. As for servo amps, they are floating around on the surplus market, too. I ended up building my own, as I couldn't find any suitable units when I needed them. I made a group project, but nobody else has completed theirs yet, as far as I know (I expect I'd get questions, etc. when they get close). I still have some of the boards left. Actually, I think the biggest question is how to find the time to play moreI was lucky to have a lull in my home business at the right time to throw my CNC together. Jon |
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Dan Mauch
I used 300 oz in stepper on my mill drill with a 2/1 ratio timing belts and
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pulleys. See the pictures at www.metalworking.com in the drop box. I think they are in the 1998 retired pictures. Dan -----Original Message-----
From: Steve Gunsel <gunsel@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Thursday, May 20, 1999 12:16 PM Subject: Re: [CAD_CAM_EDM_DRO] Still not started From: Steve Gunsel <gunsel@...>etc.)? discussion of shop built systems in the above catagories. |
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In a message dated 5/21/99 3:36:21 AM Hawaiian Standard Time,
dmauch@... writes: << I used 300 oz in stepper on my mill drill with a 2/1 ratio timing belts and pulleys. >> Dan, Just how fast does this setup go? I tried 300's on a FB-2 direct drive with poor results. I figured it was a smaller machine. I will be installing the 2:1 reduction in a week or so... I'm fighting the backlash also. The z axis is worst on climbing to home. I'm gonna try nitrogen springs from a hatch back car. Peter |
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Dan Mauch
My mill drill did at least 66 IPM . But I have ballscrews on the x and Y
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axis and was using my 5 A drivers for the motor power . The motors were 300 ounce inch motors. I have solved the quill backlash problem and now have .0019 backlash in the quill. Dan -----Original Message-----
From: PTENGIN@... <PTENGIN@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Friday, May 21, 1999 9:24 PM Subject: Re: [CAD_CAM_EDM_DRO] Still not started From: PTENGIN@...and pulleys. >>discussion of shop built systems in the above catagories. |
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