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  1. neomoses

    Wire rope - why not aluminum?

    The main thing that puts aluminum ahead of steels is the strength to weight ratio. I'm not sure what references you're using, Philrock, but mine are saying that most aluminum alloys have a higher strength to weight ratio than most stainless steels. corrosion resistance was one criteria that...
  2. neomoses

    Wire rope - why not aluminum?

    I'm in a DFM class at the moment and am actually trying to use all of the 'tools' they have taught us to this point to select a material and process for manufacturing all the parts in our design. So.... we're stuck at the wire rope (cable). All of the material properties are pointing us in the...
  3. neomoses

    Help with building a current supply

    I'm looking to build an adjustable current power supply for anodizing. I've got everything to make a 12V, 10A, unregulated power supply (Transformer, Bridge Rectifier, 27,000 uF Capacitor to smooth out ripple). I now need some help with the closed loop current control. Basically I'm wanting...
  4. neomoses

    How to Control a Relay with a PC

    I think I'm gonna go with kit 108 from Kitsrus. It looks like it'l do exactly what I want, and is under $60. I had no luck finding a "programmable relay" with basic internet searching (google, yahoo, etc...) Everything I saw while searching for that was quite expensive, over $100...
  5. neomoses

    How to Control a Relay with a PC

    Thanks gezcooke and OperaHouse, that's almost exactly what I was looking for. The MPJA kit looks nice (especially the price.) It even looks like they have a program available for windows NT/2000! Melone, could you tell me more about programmable relays? I may be able to make them work. I'm...
  6. neomoses

    How to Control a Relay with a PC

    I need help. I'm trying to do some development on a project, and I would like to be able to energize a circuit with a PC or other device that would give me an adjustable and repeatable on/off signal. For example, I may want to turn the circuit on for 1 minute, then off for 5 minutes, or I may...
  7. neomoses

    Centrifugal pump impeller design

    QUOTE: "reflection indicates that he actually must INCREASE flow if he wishes to improve cooling." Yes, this is obviously true. after reading my initial post, I see that I was unclear in my statement. My pump currently can deliver a MAX flow of 2650 LPH at 0 head and a MAX head of...
  8. neomoses

    Centrifugal pump impeller design

    heat sinks that utilize heat pipes have been used successfully with high RPM fans, but even the best aircooled heatsinks have trouble keeping temperatures low enough at high heat loads. In order for aircooling solutions to be viable, they require very loud fans or blowers (50-70 DbA), which is...
  9. neomoses

    Centrifugal pump impeller design

    I'm working on an interesting problem which involves cooling very small areas, specifically electronics components. The current method involves using water circulating through copper heat exchangers (waterblocks). The constraints I must work in demand: 1. small size. Everything must fit...

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