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  1. allenchu

    Sub-Zero process Equipment

    My company plan to set up a sub-zero process capability and get the Nadcap certificate. I know the equipment should follow the AMS2750D, it means TUS ans SAT must be meet. but I have no idea about the detail equipment specification of the freezer. Most of my friends just have the experience in...
  2. allenchu

    Definition of 1 X 10 -3 Torr Range

    VE1BLL, Yes, we have the dispute now. the actual measurement is 7.03 X 10 -3 Torr, supplier insist this meet the specification. He said the "1 X 10 -3 Torr Range" means "1 to 9.9 X 10 -3 Torr" is the contract specification range. I thought that " the best vacuum is 1 X 10 -3 Torr Range" can be...
  3. allenchu

    Definition of 1 X 10 -3 Torr Range

    The best vacuum level I need is 1 X 10 -3 Torr. But I jsut found that I made a mistake, it was written as " 1 X 10 -3 Torr Range" in the contract. Will someone heip to let me know what the difference in between? Does the supplier still have to meet the best vacuum level? if yes, where I can...
  4. allenchu

    Fixed or Adjustable thread ring gage

    please help to provide some information below. what is the difference between the Fixed thread ring gage and the adjustable ring gage? How do I know which one will be the best to be used/purchased? Is the calibration method can be a problem? Thank you.
  5. allenchu

    Grinding problem û canÆt meet Roughness 0.2 micro mm

    The wheel dressing has been tried to every 8 pieces. I guessed the wrong wheel was selected, not relate to wheel dressing. I used the 93A60J8V7N grind wheel today, the result is not good, and the roughness is 0.6. Yes, I would like to rough in and finish grind in the same operation cycle. Does...
  6. allenchu

    Grinding problem û canÆt meet Roughness 0.2 micro mm

    Grinding problem – can’t meet Roughness 0.2 micro mm I had a problem in grinding operation. Is anybody can help me to provide your comment? Material: AMS 5659 (H1025) Corrosion Resistant Steel Dimension: (in mm) Before grinding: 11.40 Dia X 8.20 Dia Specification requirement: 11.20 Dia...
  7. allenchu

    Terms relative to Press work

    is there anyone can give me the definition or explaination about the terms below: Shell Press multi die multi die tooling die shoe conversion press system RPT SOT thank you.
  8. allenchu

    What is lonograph test?

    Is someone can let me know what lonograph test is? what specification will be used? thank you.
  9. allenchu

    UNJF Ring/Plug Gauge usage

    mcgyvr, Thank you
  10. allenchu

    UNJF Ring/Plug Gauge usage

    Is somebody can help me to confirm the following: A UNJF Ring Gauge can be used to inspect the component's UNF External Thread. A UNJF Plug Gauge can not be used to inspect the component's UNF Internal Thread. Thank you.
  11. allenchu

    [b]What's the difference among Grinding, Lapping, Honing, Polishing

    For Grinding, Lapping, Honing, Polishing and burnishing, they all make a good surface finish and just remove very little amount of material. Will somebody can help me to provide their exact definitions and the differences in between. Thank you for your help.
  12. allenchu

    What is the definition of Deep Hole manufacturing

    As I know, the term of Deep Hole Manufacturing is according to the ratio of the Diameter and the length of the hole to be manufactured. If the actual ratio value is smaller, then it can be named as Deep Hole manufacturing but a common machining or drilling. I can’t remember this ration value...
  13. allenchu

    What is the ANSI Standard # for Gage Calibration?

    I am new in calibration. A customer asked me what ANSI standard do you use to calibrate the caliper, micrometer, depth gage, etc., I can't find the answer from the internet. What I do is according to the supplier’s spec. or catalog. Is anyone can help me? Tell me the ANSI Spec. # for different...
  14. allenchu

    RUNOUT Measuring Method for a Driving Shaft

    Thank you for your suggestion,Powerhound. I don't know what it will be used for. The customer didn't provide the answer and I can not answer your question due to the NDA. Could you give me some more suggestions about this issue? Allenchu
  15. allenchu

    RUNOUT Measuring Method for a Driving Shaft

    A Drive Shaft is going to be measured, but there are some considerations that I don’t have the answers yet and don’t know if the measuring method I planed is correct or not. Please help me to provide the answers or your suggestions. Drive Shaft Description: Overall Length: 380 mm Diameter A...
  16. allenchu

    What is the difference between Runout and Concentricity???

    one more question about the concetricity vs Runout. Can I use CMM to measure the concetricity and Runout? And does CMM can get the exact measurement?
  17. allenchu

    What is the difference between Runout and Concentricity???

    1. What is difference between Runout and Concentricity, esp. just want to get a coaxiality. 2. Does Runout applied on rotating part only? If not, then I thought it is same as concentricity. Am I right?
  18. allenchu

    Specimen Spec. for Material CF8

    Hi All, I'm not familiar with the Material Test. One of the customer is asking a test. Material is cast steel CF8, and the requirements as following: Tensile Strength : 485 MPa Yield Strength : 205 Mpa Somebody told me that the NO. of specimen should be selected first. Does someone can...
  19. allenchu

    How to Gage R&R Flatness?

    Hi All, One of our customers asks me to do the Gage R&R on a sheet metal part. One of the critical requirements is Flatness. We know that flatness (.008 inch) may be inspected by CMM(program and non-program) or manually with indicator. I thought that this may not a good idea to do the Gage R&R...
  20. allenchu

    What is the differences between ASME Y14.5M and ISO 1011 ???

    As I know, ASME Y14.5M-1994 is a complete GD&T Spec., but ISO's GD&T is splited into many ISO specifications. Is any boby tell/provide me the whole ISO specification NO., which related to GD&T? And What are the differences between these two GD&T specifations? Or where I can find the answer.

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