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  • Users: dho
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  1. dho

    impregnation of aluminum casting

    the final product will be anodized. so, my question is which process first, anodize or impregnation? thanks.
  2. dho

    ARP5935

    ARP5935 para 3.6, for type 1, requires Rmr 70 - 90% at C0=5% and C1=.25Rz. our grinder never met 70-90%. do you know any one can do it? what special process? thanks.
  3. dho

    how to do it ?

    the first Inventor file shows an endmill cutting, but it would be not the right way to model it. (the .25R corner next to the small hole) the second file, used fillet radius, but it does not represent the actual part. how to do it...
  4. dho

    HELP, HELP, HELP !

    Pin gauge. if it is marked 1.000-, what the exact diameter it is? no class is etched on it. as I read, (-) means no-go. so it would be smaller than 1.000000". but by how much? thanks.
  5. dho

    thread dimensions

    i like to define a custom thread. 1,625 major diameter, and 56 pitch. mil-s-8879 says the pitch diameter tolerance per ASTM B1-1. i could not find it in B1-1. help me to find all the diameters/tolerance, major, pitch, minor, male and female. thanks.
  6. dho

    3000 psi metal seal

    anyone knows an industry standard of this type metal seal? thanks.http://files.engineering.com/getfile.aspx?folder=cdfd9714-1c88-4871-9fc9-bae2aafd0433&file=seal_back.JPG
  7. dho

    single point thread rolling

    I tried to find more info to educate myself about SINGLE (yes, SINGLE) point thread rolling, I could not find any info. how it is done, who is doing. shine any light for me? thanks.
  8. dho

    passivation of PH13-8MO

    should passivation be done over the whole part prior to shot peen (mil-s-13165) which covers part of it ? thanks.
  9. dho

    NI SPAN C ALLOY 902

    this is constant elastic module E alloy. how about the torsional module G ? thanks.
  10. dho

    NEED HELP. BEARING AREA RATIO

    PLEASE HELP ME........... Link
  11. dho

    bearing area ratio

    need help. thanks. Link
  12. dho

    bearing area ratio

    the requirement: Ra 2 to 4 microiches Rz 40 micorinches max Rp 8 microinches max bearing ratio, shall be 70 - 90% when measured at a depth P = 0.25 Rz. where/how i interpret the attached measurement about bearing area ratio...
  13. dho

    explosion

    http://www.eng-tips.com/viewthread.cfm?qid=409154
  14. dho

    Minimum energy for explosion ignition

    the minimum ignition energy is 100 micro joules. we have a pressure switch rated 28 VDC at 0.5 amp to be installed in a fuel tank. how can we show any spark/arc (during break and make) is below 100 micro joules? thanks.
  15. dho

    Desired grain flow

    say a forging, produces a desired grain flow. annealing will not affect that grain flow, right? and keep the benefit of the grain flow, right? only solution heat treatment will remove the grain flow, right? thanks.
  16. dho

    position tolerance

    FORTUNE 500 (COUPLE DAYS AGO, I POSTED "FORTUNE 500". I WAS NOTIFIED THERE WERE 5 OR MORE FOLLOW UP THREADS, WHEN I TRIED TO OPEN IT, I GOT SYSTEM ERROR RESULTED TO RESET MY PASSWORD.... AND MY POST WAS GONE.) is this position tolerance correctly specified ? if not, the supporting ASME Y14.5...
  17. dho

    RTCA/DO-160D, section 22

    anyone know the way of this test for it is a pressure switch to monitor the hydraulic pressure. (like your home well water pump switch.) It is just a pair of on-off contacts. In old days, +28 VDC in, thru the switch out to the lamp, then go back to -28 VDC. (nowadays, maybe lower voltage and mA...
  18. dho

    testing lab

    the pressure drop of a fuel valve needs to be measured (tested). one end of it is a bellmouth and the other Gamah fitting. the flow rate in 120 gpm. searched online and could not find a lab. anyone have some info? thanks.
  19. dho

    position tolerance

    can a feature's position tolerance having itself as a datum? i like to control the hole location real tight ref to main axis and end plane, but it could be loose relative to flange orientation. if the part axis A, end surface B, the hole in concern C, the position tol of the hole "POS dia .002 S...
  20. dho

    torsion spring, autodesk inventor

    here is a SQUARE WIRE torsion spring. if you zoom in at the 90 degree bend, you can see the mis-match. any way to do it better? or do it correct? thanks. also, when i do a 3D spiral "line", how to line up the end with one...

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