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  1. eks32

    looking for explanation of GH5 tapping spec

    Hi, We have an application that requires easy threading of a 4" 1/2 13 bolt into a 4" long coupling nut. My problem is that every time I read the GH specs I find on the web, I can't tell which way the extra .0005" goes and/or whether it's a tap or die that is being discussed. We're looking...
  2. eks32

    simplest circuit to simulate an RS232 signal

    it won't get productized. Each serial channel was going to have it's own serial channel. Yes, it's inelegant, but I wanted to avoid having to pick out a uC and get a development board. The choices are completely bewildering in their scope, but I completely understand why you'd suggest the uC...
  3. eks32

    simplest circuit to simulate an RS232 signal

    Hi, I've got a timing application for a few sensor channels. The circuit to monitor the event at each channel works fine, and I'm thinking that if each channel could just send "some" data over the serial lines, then a central PC could take care of all the timestamping. Is there a dirt simple...
  4. eks32

    US equivalent to 65Mn (Chinese steel) ?

    Hi, I've got hold of some samples of 65Mn stock (.050" thick) that seem "almost" like stainless. I'm told in China it's considered a cheap,tough steel good for a lot of applications requiring some temper. By this page http://www.castingsqd.com/products.htm it seems that 1065 is the closest...
  5. eks32

    Die casting questions: choice of Al-Zi-Mg alloys

    thanks for the additional references. I'll review and let people know how it turns out...
  6. eks32

    Die casting questions: choice of Al-Zi-Mg alloys

    Hello, I apologize for not being too clear in my initial description. The required internal complexity (keys, lips & webbing) is equivalent to those utility knives. Since, the outside surface can't be stamped in, this part would require at least two stampings,so I think the best candidates...
  7. eks32

    Die casting questions: choice of Al-Zi-Mg alloys

    Hi, I'm designing a part with a size and complexity comparable to a standard retractable utility knive. These knives seem to be diecast from whitemetal (some alloy of Al,Zi,Mg) but my spec on surface hardness is tougher than the samples I've tested. This app is cost sensitive, and my reading...
  8. eks32

    easiest way to rustproof carbon steel that can withstand scraping

    I have been reviewing my original question and the very thoughtful recommendations. I went to the local hardware store today, and the shopkeeper suggested Car Wax and/or boiled linseed oil. I mentioned it was for indoor use, but I think I'm after a "farmer's almanac" approach that people...
  9. eks32

    easiest way to rustproof carbon steel that can withstand scraping

    Hello, I have some carbon steel straps (length=10" xsection: .06"x1.25") that see some friction and some humidity (indoor environment). Ideally, I'd like a wonder paint that is very tough, completely rustproof and can't be scraped off, but that all seems mutually exclusive. I could even see...
  10. eks32

    injection molded part design rule question: thickness variation

    Folks, I'm reading that people view the blowing agent (BA) as a "last measure" sort of thing; Something you can't rely on in a design. I guess I'm trying to tie my experience of the BA "magically" fixing a design that "should have worked" back into the next rev. Relating to this picture, Let...
  11. eks32

    injection molded part design rule question: thickness variation

    Mike, I really value the time anyone spends on this forum answering my gimmes. Analytically ( in solidworks) it's an extrusion, but the total length is only 14"-and it's on a curve, but the extrusion path radius is pretty large compared to the x-section, so I strongly believe the sinking...
  12. eks32

    injection molded part design rule question: thickness variation

    Absolute and vary thicknesses ? At present, the worst case is this section /| |\ __| | | |__ | | | | | p | | | \ |______| / `.z p _.' `-....-' where min thickness @ z is...
  13. eks32

    injection molded part design rule question: thickness variation

    Hi, I'm talking generic ABS, and probably with some blowing agent if I'm reading the replies correctly: The extrusion has a left and right side, so that the the same part mates into itself. When joined, there's a rectangular hole in the middle. I'm trying to do this without any slides- a...
  14. eks32

    injection molded part design rule question: thickness variation

    Hi, All the design rules I've read on injection mold design suggest maintaining uniform thickness to avoid sinking. On my first design, I toiled for hours to get a uniform thickness (within %10) , the mold house was happy and the prototypes came back with all sorts of sinking. So the mold...

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