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Recent content by tgwms

  1. tgwms

    standard sheet impression dies?

    Hi, i'm designing a very low quantity and low cost device from thin sheet metal, and i need to give the flat sides some rigidity. i've seen in stamped parts a designer can bend/press ribs, small folds, or other small impressions to give the metal some third dimension for rigidity... but if im...
  2. tgwms

    motor type selection - laboratory instrument

    yup... once a day. an average user would only use this device for 3 mins (average) per day each day for the 5 year life of product. thanks for the electrical hints towards control schemes... i wont be doing the design myself; we will contract that. i simply wanted to research relative...
  3. tgwms

    motor type selection - laboratory instrument

    aaahh... yes i should look up these electrical terms before i ask dumb questions. thanks keith and wikipedia. so off 'topic', but to control a DC motor closed loop to 10% accuracy do i need an encoder or can it be done with back EMF? - - - - - - - - - - - - - - - - - - - - - "Imagination is...
  4. tgwms

    motor type selection - laboratory instrument

    wow skogsgurra... i wasnt expecting someone to go so far as even recommend a part number- thanks! and yes, that indeed looks well suited. now if the bosch website would just cooperate and give me a US distributor! ha can your H-brige control solution meet the 10% speed accuracy needed? thanks...
  5. tgwms

    motor type selection - laboratory instrument

    Good points... sorry, some things I take for granted as I am around these projects everyday. The device could most easily be compared to a kitchen blender in size and useage, however unlike the blender, noise must be kept to a minimum. Efficiency is not a concern. Annual volumes are below 100...
  6. tgwms

    motor type selection - laboratory instrument

    We are planning a benchtop laboratory product which turns a special processing device for grinding and homogenizing various tissues and plant matter. I am doing research to find the best type of motor to do the job. My experience is with direct-drive brushless motors and gearhead DC motors, but...
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