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Recent content by Allen

  1. Allen

    Sheet Metal Box Bending DFM

    Thanks Lucky, We'll have to outsource this, we don't have bending capability.
  2. Allen

    Sheet Metal Box Bending DFM

    Hi All, Quick question regarding sheet metal bend DFM. I'm new to sheet metal design. Is attached design a doable with one piece sheet and bend + seal weld corners? Dim: ~40"x5"x1" with 14gauge SST. Many Thanks
  3. Allen

    440C SST Magnetic Strength

    Hi, I'm trying to redesign and replace bunch of locating pins which currently are made of O2 Steel with 440C SST ones to avoid corrosion, Pins must be magnetic, wonder if anybody ever compared these two materials magnetic strength? Any idea in case 440C is less magnetic? How much? Thanks Allen
  4. Allen

    10.9 vs 8.8 Grade Bolts

    What is the application? what is cold weather temp? 10.9 is more stronger Cold weather will shrink both the bolt&nuts and the components attaching, if you ONLY worry about loosening consider using spring/lock washers. see the chart from Mc Master...
  5. Allen

    Which book about threaded fasteners?

    kingnero, I am not familiar with the books you mentioned but I've downloaded two free pd e-books. Fastener Design Manual - NASA: http://gltrs.grc.nasa.gov/cgi-bin/GLTRS/browse.pl?1990/RP-1228.html Fastener Training Manual: http://www.jamesglen.com.au/training-manual/ The second one is a nice...
  6. Allen

    metal properties

    "Key to steel" may be you mean fcsuper.
  7. Allen

    Good free software

    Here are my bookmarks for freeware: http://www.nirsoft.net/utils/index.html Some useful free utilities. http://www.snapfiles.com/ Separated by freeware and shareware directory search. I always find good freeware here.
  8. Allen

    Large gear ratio

    As you are going to build a simple gear train for rotating a robot bird I guess transmitted force and torque is not the issue (they must be relatively small) if so, then you may use any diameter of gears to fit in desired box. E.g. you may use four spur (or helical) gears with combination of...
  9. Allen

    2nd speed reducer

    The only thing that I can mention is the efficiency which will reduce with two reducer so the input power needed will increase. Cheers
  10. Allen

    Question about Adobie PDF writers.

    By the way, I myself prefer to convert the drawings to TIFF file format istead of PDF, so zooming and reviewing of such files are more easier and also printing has better quality.
  11. Allen

    Question about Adobie PDF writers.

    there are tons of such convertors for free also: http://www.google.com/search?client=opera&rls=en&q=free+dwg+to+pdf&sourceid=opera&ie=utf-8&oe=utf-8
  12. Allen

    What should i do?

    I have a situation like yours in my company, since I am working in a small company I am preparing my own drawings and check them myself. My suggest is that make a checklist for yourself . the most terrible thing that I myself afraid of when prepare a drawing is “dimensioning in CAD” and “Bill of...
  13. Allen

    Read any good books lately?

    some of my favorites : The Alchemist Veronika Decides to Die By the River Piedra I Sat Down and Wept ---All by Paulo Coelho and I always review my notes on quotations.
  14. Allen

    Interviewing dilema

    Remember that interview is a formal meeting.
  15. Allen

    Dog Clutch in tandem rear diff

    Try here: http://www.eng-tips.com/threadminder.cfm?pid=78
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