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Recent content by popm

  1. popm

    Question about a Surface Finish symbol

    To powerhound, Thank you so much for your answer, looks like it is drawn by a newbie. However, I've seen more weird drawings than this. Have a nice one.
  2. popm

    Question about a Surface Finish symbol

    Hi members, can someone explain the meaning of the Surface Finish symbol in the attachment? and what does "C40" mean? Material or Rockwell hardness? Thanks a lot!
  3. popm

    Helical worm gear without ventilation

    I think the reason why people don't use expansion tank in Gearbox is just not necessary, because the pressure in it is not so high as that of pumping system, boilers and car engines. A breath valve works well why bother a bigger and some more expensive expansion tank? For your application...
  4. popm

    Helical worm gear without ventilation

    "The volume of the heated oil is thus 1*(1+(80-20)*0.7*10^-3) = 1.042 liter." I'm wondering it should be 0.8*(1+(80-20)*0.7*10^-3) = .....
  5. popm

    What's wrong with my SolidWorks 2010? Always overlapping

    Thanks a lot, CorBlimeyLimey, I installed the "new" drivers(10-2_legacy_vista32-64_dd_ccc) of the ATI card, now it's fine with SolidWorks...thank you again.
  6. popm

    What's wrong with my SolidWorks 2010? Always overlapping

    I just installed Solidworks 2010(64bit) on my laptop, but when I use 2d or 3d it always has overlapping when i roll the mouse middle button, see the attached photo. don't know why. My laptop is Toshiba Satellite L350D, AMD Turion 64X2 Dual-Core 2GHz, 4GB 800Mhz SDRAM, 250GB HDD with Vista 64...
  7. popm

    How to understand Lead Chart and Profile Chart in Helical Gear Drawing

    Thank you so much,Gentlemen! so glad to get the answers though it takes time to understand...
  8. popm

    How to understand Lead Chart and Profile Chart in Helical Gear Drawing

    Hi israelkk, I checked it online, but cannot find which AGMA standard I should look, can you give me the standard number? I appreciate your help.
  9. popm

    How to understand Lead Chart and Profile Chart in Helical Gear Drawing

    The Profile Chart, please see the attachment? My question is what the data mean ih the chats? any reference books or articles? Thanks a lot!http://files.engineering.com/getfile.aspx?folder=7cc09b3f-f9d6-4796-b2bc-76a1ece64c04&file=Profile_Chart.jpg
  10. popm

    How to understand Lead Chart and Profile Chart in Helical Gear Drawing

    How to understand Lead Chart and Profile Chart in Helical Gear Drawing? See Below Pics. Some Information of the Helical Gear: PROFILE TOLERANCE (SEE FIG. 1) 0.0038 LEAD TOLERANCE (SEE FIG.2) .01
  11. popm

    Questions about a Casting Drawings

    A call-out note for two holes on a casting drawing say: ?.468 Drill ?.500 Reground E.M. ?0.5025 Reamer 2X?.5025+/-0.010 THRU questions: 1. what's E.M. represent? 2. Reground is supposed to have a higher accuracy than "Reamer", why is the "reground" before "Reamer"? 3. Is "Reground"...

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