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  1. BreadboardPerson

    How to properly use a digital caliper?

    Hi, I zero the caliper at the beginning of each use. I noticed that depending on where I use it and even at the same location, depending on how much force I use to close the caliper, I get different values. So I get different readings all the time. What is the proper way to get the measurements...
  2. BreadboardPerson

    Why drill bits bought from Amazon cannot even drill IKEA wood?

    Hi, I bought a set of drill bits from Amazon: Hymnorq 1.0 to 10mm Metric Jobber Twist Drill Bits Set of 19pcs Titanium Coated HSS 4241, Straight Shank for General Purpose in Wood Plastic and Soft Metal Sheet To my disappointment, they could not even drill IKEA wood! How come? Are there any...
  3. BreadboardPerson

    Is there any advantage buying screws from McMasters vs from Home Depot and Amazon?

    The screws from McMasters are quite expensive. Any advantage buying from them vs. from Home Depot and Amazon?
  4. BreadboardPerson

    Where can I find shorter tapered heat set inserts for plastic?

    Hi, where can I buy tapered heat-set inserts of about 2-3mm short for M2.5 screws? So far, I cannot find anything shorter than 3.5mm. How come?
  5. BreadboardPerson

    What are the pros and cons of coreless vs. cored DC motors?

    Hi, what are the pros and cons of using careless DC motors over cored counterparts?
  6. BreadboardPerson

    Washers thickness tolerance

    Hi, I am looking for washers. On McMaster webpage, for each washer they list a range of thickness of about 0.4mm difference. Is it all by luck in getting the thickness I want? Can't they make exact thickness? When designing mechanical devices that use washers, which thickness value should I use...
  7. BreadboardPerson

    Countersink M2-M2.5 screws not able to tighten the frames

    Hi, I assembled some frames using M2-M2.5 countersink screws but I noticed that due to the countersink shape, it seems that these screws are not able to mount the frames as tightly as those flat head bolt screws. I mean I could still slide the frames around after tightening up the countersink...
  8. BreadboardPerson

    What are some of the common names for this part?

    Hello, I forgot the name of this part. what are some of the common names?
  9. BreadboardPerson

    Are Delrin Composite gears in motors as good as metal gears?

    Hello, assuming that everything of the three motors are the same except that the gears are made of different materials. The first one is made of Delrin composite gears, the second one is made of metal and plastic gears and the last one is made of metal gears. How are they ranked in terms of...
  10. BreadboardPerson

    What is this?

    Hello, how to call this in English?http://files.engineering.com/getfile.aspx?folder=2eca9013-a65d-4da4-bbbd-e114febc2dae&file=product.jpg

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