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Recent content by Nashanas

  1. Nashanas

    Defective instrument usage in less precise works

    Hello, I have a question regarding usage of defective instruments in production line. If an operator of assembly area is using lets say a defective Vernier caliper. The caliper has an error of 0,1mm so it can not be used by machining department, but the assembly department has acceptable error...
  2. Nashanas

    Surface coating inspection

    Hello, I have a question regarding surface coating inspection. I have implemented controls in my process for wet film inspection, DFT inspection, surface adherence inspection using SSPC standards. But there is one argument which is embossed painting, as shown in the photo. How can one create...
  3. Nashanas

    Carbon steel case hardening color

    Hello, I have a question about the physical appearance of carbon steel after it is hardened with inudction hardening vs carburising. The steel grade is C45. The reason for question is we have parts with indication of induction hardening to 52 HRC on design. I control it with a portable...
  4. Nashanas

    Ball bearing repair

    Hello everyone, We have to overhaul an old machine, its a marine loading arm manufactured in 1980. On top of column there is mounted a big bearing with 3 ball races. The ball races show flase brinneling marks. The bearing is manufactured in such a way that there are 3 semicicular tracks...
  5. Nashanas

    Surface Hardness of HAZ of martensite stainless weld

    The surface hardness value can be set by any relevant customer specification or construction code. What was the hardness value of base metal before welding? And what is the hardness value that you have foundin the HAZ? Which instrument did you use to find the hardness value?
  6. Nashanas

    ASQ CQA

    Dear all, Is there any ASQ CQA here, or has anyone experience of this exam? I want to go for it. I did a sample exam and I was able to solve 60% without preperation, so a month of preperation will be enough for me to be ready for exam. I have MSc Desgree in Mechanical Engineering and 8...
  7. Nashanas

    Quality Audit for renewal ISO 9001

    Dear all, Thank you for a great dscussion. In the end the audit was as described by Mr. Gr8blu. The auditor cheked some of the documentation of the orders to verify if we in reality implement what is written in the procedures. He did not go too much in detail in to the procedures as he has a...
  8. Nashanas

    Quality Audit for renewal ISO 9001

    Hello everyone, I have recently joined a company as quality manager. We have to perfrom a renewal of our quality certification ISO 9001. This is my first time to face an audit. I was studying some books by ASQ and following some courses to prepare for the audit. The company also has a...
  9. Nashanas

    Bearing rotation problem

    Hello everyone, Is it possible that a bearing rotates 90 degrees anticlockwise, and then when rotated back 90° clockwise it does without any problem. But when it is rotated further in the clockwise direction by 10° it resists the motion as if it has some mechanical defect inside? If there is...
  10. Nashanas

    Hydraulic Cylinder piston rod plating

    But is there any standard which sets minimum limits? Or its an open path for designer to do as he likes?
  11. Nashanas

    Hydraulic Cylinder piston rod plating

    Hello everyone, Is there any standard which establishes the minimim thickness of chromium plating on the steel rods of hydraulic cylinder? We are making a machine to be installed on sea side with supposed life of 25 years. The hydraulic cylinder rods commercially available are with 20 microns...
  12. Nashanas

    Hydraulic cylinder piston rod plating

    Hello everyone, Is there any standard which establishes the minimim thickness of chromium plating on the steel rods of hydraulic cylinder? We are making a machine to be installed on sea side with supposed life of 25 years. The hydraulic cylinder rods commercially available are with 20 microns...
  13. Nashanas

    Gears load

    I have found the equation for tangential load on the gear teeth: Wt = (60000*P)/(pi*d*n) P = Power (KW) d = Diameter (mm) n = rpm Wt = Tangential load in KN Since the two idlers will not be transmitting force to there shafts, theoretically, the power of pinion will be divided equally among two...
  14. Nashanas

    Gears load

    Hello everyone, I have a very basic question about gear train design. In this design, it can be seen that there is a set of 3 gears with same ratio, which are being used to move the bigger gear. I want to usa only one gear instead of three to move the bigger gear. But I have been told that...
  15. Nashanas

    Quality Manual

    The point is that if this is a requirement of ISO 9001 or any other QMS standard? Or its just a company policy?
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