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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Replacement motor w/ higher rpm/VFD
Awl--
I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? TIA! ---------------------------- Mr. P.V.'d formerly Droll Troll |
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Proctologically Violated©® wrote:
Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? I have a pair of Hitachi 1hp VFD's on my lathe and mill. They were NOS and were about $100/ea They work fine. That said, a VFD would probably work. I have no problem with torque at 50% speed. OTOH, I'd be scared ****less that some sort of malfunction or missuse would give the motor 100% speeed, or worse - 150% or 200% speed and detonate the wheel... |
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"Jim Stewart" wrote in message ... Proctologically Violated©® wrote: Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? I have a pair of Hitachi 1hp VFD's on my lathe and mill. They were NOS and were about $100/ea They work fine. What is "NOS"? Where'd you get'em from? ---------------------------- Mr. P.V.'d formerly Droll Troll That said, a VFD would probably work. I have no problem with torque at 50% speed. OTOH, I'd be scared ****less that some sort of malfunction or missuse would give the motor 100% speeed, or worse - 150% or 200% speed and detonate the wheel... |
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Proctologically Violated©® wrote:
"Jim Stewart" wrote in message ... Proctologically Violated©® wrote: Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? I have a pair of Hitachi 1hp VFD's on my lathe and mill. They were NOS and were about $100/ea They work fine. What is "NOS"? Where'd you get'em from? ---------------------------- New/old stock. Old stock that has never been used. http://cgi.ebay.com/ws/eBayISAPI.dll...8332 921&rd=1 Same seller I've done business with, no problems. That said, a VFD would probably work. I have no problem with torque at 50% speed. OTOH, I'd be scared ****less that some sort of malfunction or missuse would give the motor 100% speeed, or worse - 150% or 200% speed and detonate the wheel... |
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"Proctologically Violated©®" wrote in message ... Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? TIA! ---------------------------- Mr. P.V.'d formerly Droll Troll You did not say what the original motor horsepower was, but a 1 horsepower 3450 motor will have half the torque that a 1 horsepower 1700 RPM motor does, because torque, motor speed, and horsepower are all related. The motor is designed to supply the nameplate horsepower at the full rated speed. If you slow the motor down with a VFD, the torque will be the same at a lower speed, or nearly the same, but the calculated horsepower changes. If you are running the motor with encoder feedback and a vector drive, you will have more torque available at very low speeds than if you are running open loop. |
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On Thu, 14 Apr 2005 17:51:30 -0400, "Proctologically Violated©®"
wrote: Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? TIA! ---------------------------- Mr. P.V.'d formerly Droll Troll I'm no expert by any means, but when looking into this solution for replacing a DC spindle drive on a CNC lathe with an AC drive the big problem would be the loss of power at lower rpm. I.E. the slower the motor went, while maintaining constant torque, the lower the HP delivered to the spindle. Now, VFDs have progressed much since then. It may be that the torque will be doubled with the halved RPM. If that's so then then it's all good, just provide enough cooling with an extra fan. But, if the torque remains the same, HP will be half. If you need the full 1 HP at 1750 rpm then maybe a two HP 3 ph motor would be best. ERS |
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Proctologically Violated©® wrote:
Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? If you need 1 HP at 1700 RPM, then get a 2 Hp 3450 RPM motor and a 2 or 3 HP VFD. (2 HP is fine if you have 3 phase power, 3 Hp is better if you are going to run it on single phase.) You can probably get the VFD for less than $150 on eBay or Dealers Electric. Maybe a LOT less, it just depends on who is selling at the moment. Jon |
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In article ,
Jim Stewart wrote: Proctologically Violated©® wrote: Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? Probably not a good idea -- but slower speeds might be an advantage at times -- for certain plastics to prevent melting. What are people paying for these sized VFDs? I have a pair of Hitachi 1hp VFD's on my lathe and mill. They were NOS and were about $100/ea They work fine. That said, a VFD would probably work. I have no problem with torque at 50% speed. OTOH, I'd be scared ****less that some sort of malfunction or missuse would give the motor 100% speeed, or worse - 150% or 200% speed and detonate the wheel... But most VFDs have the ability to set a maximum allowed frequency (you have to spend some time in the manual to find which parameter to change and how to change it), so there would be no risk of running at 200% speed. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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"Jon Elson" wrote in message ervers.com... Proctologically Violated©® wrote: Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? If you need 1 HP at 1700 RPM, then get a 2 Hp 3450 RPM motor and a 2 or 3 HP VFD. (2 HP is fine if you have 3 phase power, 3 Hp is better if you are going to run it on single phase.) Sounds like a plan. Cupla people have mentioned programmable/vector drive stuff. I would imagine this "costs extra". Is it worth it? Is there anything ito of older/cheaper VFDs that I should avoid? ---------------------------- Mr. P.V.'d formerly Droll Troll You can probably get the VFD for less than $150 on eBay or Dealers Electric. Maybe a LOT less, it just depends on who is selling at the moment. Jon |
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#12
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If you're repairing the unit to put it to work for your own use, you could
probably fabricate a mount for a common 1725 RPM TEFC motor and use a coupler to connect it to the input shaft. Almost any good quality 1/2 to 1 HP motor should be adequate for a belt sander, depending on how big the parts are that you want to grind/sand. Don't be too easily impressed by HP, a 1/2 or 3/4 HP motor delivers a lot of power for a belt sander. TEFC is highly recommended because the grinding dust will get into a open-frame motor. If you decide you need other speeds, a jack shaft can be added to almost any application with some parts and additional base plate area. Otherwise, you might also consider a variable speed DC drive. WB ................. "Proctologically Violated©®" wrote in message ... Awl-- I acquired this incredible Engleberg 4" pedestal belt sander, but w/ shot motor, shot driveshaft, on which I've posted elsewhere. The replacement motor is proving to be a problem. Direct replacment is possible, but expensive. (Cast iron finned, 1700 rpm, 143 frame). Rewinding is expensive. But I've been finding possible motors, but w/ 3450 rpm, 3 ph, 1 hp. Would this motor on a VFD be a viable solution? As a direct drive unit, I don't have the luxury of mixing pulley ratios, so would torque be a problem, at dialed-down speeds--actually, 50% speed? Would the higher speeds be any advantage for some materials?? What are people paying for these sized VFDs? TIA! ---------------------------- Mr. P.V.'d formerly Droll Troll ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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