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edm wire .002 Wire EDM gantry (1 viewing) (1) Guests
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TOPIC: edm wire .002 Wire EDM gantry
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edm wire .002 Wire EDM gantry
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Hello all, I'm designing a CNC wire EDM gantry, and I have a bit of a problem. With wire EDM, the wire must be supported both above and below the work piece (In my case, it will probably be copper sheet, <0.025 thick). I would like to make the wire move, rather than the work piece (Which will probably be a sheet about 18 X12 or so). The problem is that the wire mounts above and below must move EXACTLY the same amount, at exactly the same time. So, should I make 2 identical slides, and hope the two motors can stay in sync, or should I use one motor and use it to drive both slides? I know this seems rather obscure, but perhaps someone has run into this and has some advice. Also, along the same lines, I think I'm going to use 2 ~3/8 ground drill rods for the minor axis slides (the one(s) I was talking about above, so they would be ~12 long). I'm wondering if 3/8 would be big enough not to deflect substantially. I'm not quiet sure about the load on them. It shouldn't be too big, but it may include a spool of EDM wire. Again, precision and repeatability are important. Another consideration is the bearings. I would ideally be using linear ball bearings, but they are too expensive, so I'm looking into other ideas. I was thinking of making Teflon thrust bearings, as I can get Teflon nice and cheap. I would like to have the system running very smoothly for good precision and repeatability, so I'm not to sure about the Teflon. Does anyone know of a supplier for bearings or some alternative? Lastly, driving the slides... Ball screws would be nice, but they are far Far FAR to expensive for this project. I need the highest precision possible for a reasonable price. I was thinking about both toothed belts, and acme rod. The system will have to be able to move as fast as the wire can cut, so any ideas on what I should use? I will have to drive both the major axis (18-24 ) and the minor (12-18 ). This wire EDM gantry is for a rapid tooling project I'm trying to build for this coming April's Science Fair. No, I can't go into specifics - yes, you're welcome to call me paranoid. Sincerest regards, Robin P.S. Does anyone know how much wire for wire EDM costs? What makes this wire so special as opposed to electrical wire? I.E. what's the diff between uncoated copper wire from the surplus shop, and copper EDM wire?
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edm wire .002 Wire EDM gantry
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P.S. Does anyone know how much wire for wire EDM costs? What makes this wire so special as opposed to electrical wire? I.E. what's the diff between uncoated copper wire from the surplus shop, and copper EDM wire? IIRC, EDM wire is brass or some fancier alloy, depending on the type. You can buy spools of it at Active Surplus, at least last time I was there. I think it was ~C$25 a spool, but my memory could be off on that. Best regards,
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The administrator has disabled public write access. |
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edm wire .002 Wire EDM gantry
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Hello all, I'm designing a CNC wire EDM gantry, and I have a bit of a problem. With wire EDM, the wire must be supported both above and below the work piece (In my case, it will probably be copper sheet, <0.025 thick). I would like to make the wire move, rather than the work piece (Which will probably be a sheet about 18 X12 or so). The problem is that the wire mounts above and below must move EXACTLY the same amount, at exactly the same time. So, should I make 2 identical slides, and hope the two motors can stay in sync, or should I use one motor and use it to drive both slides? I know this seems rather obscure, but perhaps someone has run into this and has some advice. Also, along the same lines, I think I'm going to use 2 ~3/8 ground drill rods for the minor axis slides (the one(s) I was talking about above, so they would be ~12 long). I'm wondering if 3/8 would be big enough not to deflect substantially. I'm not quiet sure about the load on them. It shouldn't be too big, but it may include a spool of EDM wire. Again, precision and repeatability are important. Another consideration is the bearings. I would ideally be using linear ball bearings, but they are too expensive, so I'm looking into other ideas. I was thinking of making Teflon thrust bearings, as I can get Teflon nice and cheap. I would like to have the system running very smoothly for good precision and repeatability, so I'm not to sure about the Teflon. Does anyone know of a supplier for bearings or some alternative? Lastly, driving the slides... Ball screws would be nice, but they are far Far FAR to expensive for this project. I need the highest precision possible for a reasonable price. I was thinking about both toothed belts, and acme rod. The system will have to be able to move as fast as the wire can cut, so any ideas on what I should use? I will have to drive both the major axis (18-24 ) and the minor (12-18 ). This wire EDM gantry is for a rapid tooling project I'm trying to build for this coming April's Science Fair. No, I can't go into specifics - yes, you're welcome to call me paranoid. Sincerest regards, Robin P.S. Does anyone know how much wire for wire EDM costs? What makes this wire so special as opposed to electrical wire? I.E. what's the diff between uncoated copper wire from the surplus shop, and copper EDM wire?
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The administrator has disabled public write access. |
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edm wire .002 Wire EDM gantry
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Lastly, driving the slides... Ball screws would be nice, but they are far Far FAR to expensive for this project. I need the highest precision possible for a reasonable price. I was thinking about both toothed belts, and acme rod. The system will have to be able to move as fast as the wire can cut, so any ideas on what I should use? I will have to drive both the major axis (18-24 ) and the minor (12-18 ). Timing belts work well if the accuracy requirements aren't too high, you can usually assume they are backlash free, but keep in mind that they do stretch. You may also be able to come up with a serpentine drive to _link_ your top and bottom wire guides using belts. Ned Simmons
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The administrator has disabled public write access. |
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edm wire .002 Wire EDM gantry
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|
Hello all, I'm designing a CNC wire EDM gantry, and I have a bit of a problem. With wire EDM, the wire must be supported both above and below the work piece (In my case, it will probably be copper sheet, <0.025 thick). I would like to make the wire move, rather than the work piece (Which will probably be a sheet about 18 X12 or so). The problem is that the wire mounts above and below must move EXACTLY the same amount, at exactly the same time. So, should I make 2 identical slides, and hope the two motors can stay in sync, or should I use one motor and use it to drive both slides? I know this seems rather obscure, but perhaps someone has run into this and has some advice. Also, along the same lines, I think I'm going to use 2 ~3/8 ground drill rods for the minor axis slides (the one(s) I was talking about above, so they would be ~12 long). I'm wondering if 3/8 would be big enough not to deflect substantially. I'm not quiet sure about the load on them. It shouldn't be too big, but it may include a spool of EDM wire. Again, precision and repeatability are important. Another consideration is the bearings. I would ideally be using linear ball bearings, but they are too expensive, so I'm looking into other ideas. I was thinking of making Teflon thrust bearings, as I can get Teflon nice and cheap. I would like to have the system running very smoothly for good precision and repeatability, so I'm not to sure about the Teflon. Does anyone know of a supplier for bearings or some alternative? Lastly, driving the slides... Ball screws would be nice, but they are far Far FAR to expensive for this project. I need the highest precision possible for a reasonable price. I was thinking about both toothed belts, and acme rod. The system will have to be able to move as fast as the wire can cut, so any ideas on what I should use? I will have to drive both the major axis (18-24 ) and the minor (12-18 ). This wire EDM gantry is for a rapid tooling project I'm trying to build for this coming April's Science Fair. No, I can't go into specifics - yes, you're welcome to call me paranoid. Sincerest regards, Robin P.S. Does anyone know how much wire for wire EDM costs? What makes this wire so special as opposed to electrical wire? I.E. what's the diff between uncoated copper wire from the surplus shop, and copper EDM wire?
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The administrator has disabled public write access. |
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