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    Mechanical Engineering Lab Manager -- University of San Diego

    Mechanical Engineering Lab Manager Department: School of Engineering Admin/Full-Time Job IRC #16769 Job Description: The Mechanical Engineering Lab Manager is responsible for the management and operations of the all mechanical engineering laboratories, the...
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    WTB: ProLight 3000 Turning Center with tailstock

    I'm looking to buy 1 or 2 Light Machines ProLight 3000 Turning Centers, with tailstock. The tool turret is preferable but not essential. The tailstock is essential. They don't need to be running, but their mechanical and cosmetic conditions need to be good (some surface rust and scratched lexan...
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    Engineering Technician and Shop Manager at University of San Diego

    University of San Diego School of Engineering IRC 14227 Description The mechanical engineering technician and shop manager is responsible for the management and operations of the all Mechanical Engineering laboratories, the engineering shop, and the Industrial and Systems Engineering...
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    Wanted: ProLight 3000 Turning Center

    I'm looking to possibly buy 1 or 2 Light Machines ProLight 3000 Turning Centers, preferably with the tool turret. Their mechanical and cosmetic conditions need to be good (surface rust and scratched lexan is ok, as long as it's easily restorable). I don't need the control box or software. Please...
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    Laboratory Engineer Technician at University of San Diego

    Job Opening: Laboratory Engineer Technician at University of San Diego (a machinist background is likely appropriate) Start at: USD: Business Services & Administration: Human Resources: Job Opportunities: Current Openings Select: "I have never been employed at USD" or whichever link is...
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    VFD noise and motor frame material?

    Thanks for the clarification on equipment v motor noise. Does anyone else have experience about the effect of motor frame material on noise from a VFD-driven motor? Thanks, David
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    Missing RPC Threads

    Something may be amiss with the site's software/hardware... I had a recent thread that disappeared over the weekend, and is now back.
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    VFD noise and motor frame material?

    Thanks for the replies and info! I’d like to control blade speed between 500 fpm and 3500 fpm (7:1), with at least 1 HP at 500 fpm. The Baldor motor I’m looking at is good for 20:1 turndown. 1 HP would be at 20% speed; 7 x 20% is 140% speed. Hopefully the fan noise will be reasonable...
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    VFD noise and motor frame material?

    For a VFD driven motor, does the material of the motor frame make much difference in the noise emitted from the carrier frequency? I know cast iron has higher damping than steel or aluminum, but I'm not sure how much this damping actually affects the acoustic noise in practice. If the effect...
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    Stirling engine: Boring a 4" pipe, 12" deep?

    Thanks for the quick replies and tips. Sorry, I should have said option #1 would also have holes(s) through the displacer cylinder to allow air passage (area equivalent to ~3% of bore... seems to be what most are using). Or, have the displacer touch the cylinder wall at 90 deg intervals with...
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    Stirling engine: Boring a 4" pipe, 12" deep?

    Thanks, all, for the helpful replies. The "appropriate technology" goal limits design freedom for some of the ideas. The diesel wet liner is a great idea if there were a local source for a lot of used ones, but we can't control that, unfortunately. Thanks for the tip on machining pipe... I...
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    Stirling engine: Boring a 4" pipe, 12" deep?

    I teach a senior design class and have a team designing/making a Stirling engine, as an "appropriate technology" project (to be produced and used in a developing country). So the overall goal is to keep things low cost and low tech. We are assuming the engine would be made in a job shop in a...
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    VFDs: used high-end vs new low-end?

    Thanks for all the quick replies. I got a 20HP Reliance SP500 tonight for $110 delivered -- worth a try for sure at that price. Good to hear the AC Techs have been working well out there... amazing that the lowest cost product is made in USA. >Why VFD a dust collector? This is a custom job...
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    VFDs: used high-end vs new low-end?

    We need a VFD to power a 15HP 460V blower (dust collector). I've been planning on getting a used/recent Allen-Bradley or Reliance or the like on ebay ($100-$200) but I just noticed the AC Tech 15HP SM4 for $510: http://www.wolfautomation.com/Product.aspx?ProductID=10262 Seems like a very low...
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    Collet closers- Lever vs handwheel

    I think it depends on what the lathe is used for. For production work, doing the same part over and over, no question lever is the best. But for prototype work, where you are switching between collet sizes frequently, or switching between collets and chucks, I prefer a good handwheel over a...
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    OT- Alternatives to computer mouse ?

    I have CTS and I like the Wacom tablets a lot. I have a Graphire3 4x5 at home and an Intuos3 4x5 at work. For replacing a mouse, I find the 4x5 size is just right -- any bigger and my hand is moving too much. Or if you want a larger tablet for drawings, you can set an active area of 4x5 for...
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    Vertical milling: change Z with knee or quill?

    Thanks for the replies... very interesting. Like the answers to most questions, "it depends...". On using the knee, I'm trying to understand why the knee would be any less accurate than the X or Y dovetails for the saddle/table. It seems to me the knee would be at least as accurate as X and...
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    Vertical milling: change Z with knee or quill?

    Thanks for the replies... very interesting. Like the answers to most questions, "it depends...". On using the knee, I'm trying to understand why the knee would be any less accurate than the X or Y dovetails for the saddle/table. It seems to me the knee would be at least as accurate as X and...
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    Vertical milling: change Z with knee or quill?

    When changing the Z dimension on a manual mill (ours are Laguns), is it better to move the quill or the knee? I was taught to keep the quill locked unless drilling, and to do all Z changes with the knee. Actually, drill with the knee if it needs to be a perpendicular hole. Occasionally I hear...
  20. D

    Vertical milling: change Z with knee or quill?

    When changing the Z dimension on a manual mill (ours are Laguns), is it better to move the quill or the knee? I was taught to keep the quill locked unless drilling, and to do all Z changes with the knee. Actually, drill with the knee if it needs to be a perpendicular hole. Occasionally I hear...

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