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  1. Charon99

    What is the standard for paint defect tolerance?

    I need to reference this in a specification I'm creating, but I don't know how to without recreating it and incorporating my recreation. Ideally I'd like to reference the specific standard and specify the scope and level required. p.s. English or Chinese (not Japanese).
  2. Charon99

    What is the standard for paint defect tolerance?

    I’m trying to identify the standard that this “Defect Comparator” is associated with. I want to refence it in a speciation. Any advice would be much appreciated.
  3. Charon99

    Variation of PA6 material properties between suppliers

    Hi all, I have a UL certified product that contains plastic parts (PA6). To attain citification all the relevant tests were done by UL including verifying the plastic material supplier was one from their list of certified suppliers. We wish to change the plastic supplier. UL are insisting that...
  4. Charon99

    Material with high coefficient of friction and good structural integrity for friction washer.

    Desrtfox, A compression spring would be good theoretically but in this instance it would be too thick. :)
  5. Charon99

    Material with high coefficient of friction and good structural integrity for friction washer.

    Thanks all, The plan was always to use belleville washers and a high friction washer of unknown material. Perhaps my error is proposing a high friction material. A similar mechanism has a thumb screw and steel washer that never works well. Unable to set the pressure accurately and needs a...
  6. Charon99

    Material with high coefficient of friction and good structural integrity for friction washer.

    The material would be clamped between a steel washer and the sliding face with a nut. More tension on the nut would result in more friction. I don’t want the material to crush or disintegrate over a short time. It will only slide 20 -50mm once a week so long term wear isn’t an issue. Positional...
  7. Charon99

    Material with high coefficient of friction and good structural integrity for friction washer.

    I’m looking for a material to give me high coefficient of friction (against steel) and good structural integrity in a 20mm o’d ish washer. The washers will be clamped against the steel offering functionality like car brake pads on a disk. But cheap, simple and small. Any advice the best...
  8. Charon99

    Controlling a spring clips dimensions

    I couldn’t imagine how I could loose 8mm out of tolerance in a final bend. The part is just too small. Your idea with a screws wouldn’t work because there’s no free space bellow the 3.15 flanges. I have done some tests and I think I can accept a tol as high as +0/-15mm on the 60.54dim. and it...
  9. Charon99

    Controlling a spring clips dimensions

    @drawoh This has to sit over a curved face, like a ring clip on a hose. The rad could be made with multiple flat faces (I guess 10). But I imagine that wouldn’t help (lots of bends with a tolerance on each bend to deal with).
  10. Charon99

    Controlling a spring clips dimensions

    @mfgenggear Thanks for your help. I’m trying to get details on the material they are using. They told me 65Nm. But I think that can’t be right.
  11. Charon99

    Controlling a spring clips dimensions

    @mfgenggear I'm confused. I thought you had to 1, Form the shape, 2, Anneal it to release stresses, 3, "harden" heat treat the part to make it springy. If 65Mn spring steel is already hardened, how do they form it without it springing back to its original shape? Why is the factory telling me...
  12. Charon99

    Controlling a spring clips dimensions

    Thanks for your help, These are being cold formed and then ht (as above) to make them "springy". Surely they must form them before ht otherwise they would not take form??? They can vary in either direction but normally the gap is opening but without any consistency. The supplier tells me they...
  13. Charon99

    Controlling a spring clips dimensions

    Hi, I hope someone can help me. I’m having problems with our manufacturing partners not being able to control the final dimensions of a spring clip. The clip is as shown in the image below. The problem is they can’t maintain the 60.54 dimension with in a tolerance of +0/-5mm. After forming the...
  14. Charon99

    Max torque a bar can be expected to support based on its tensile strength

    Medium carbon steel with a tensile strength of 800n/mm^2 Different diameters of the steel would support different torques. What torque could I expect a 5mm dia Bar to support before any permanent deformation. Then I’d like to be able to calculate with different tensile strengths and bar...
  15. Charon99

    Max torque a bar can be expected to support based on its tensile strength

    I wish I knew. I need help. If I was to measure the yield torque and yield tensile load on a range are bars with differing tensile yield strengths I expect to find a correlation between tensile load and torque measured. How do I calculate this correlation?
  16. Charon99

    Max torque a bar can be expected to support based on its tensile strength

    Yes. The problem is I’m comparing apples to pears. I’m trying to calculate the torque that can be expected based on a specific tensile load. Or if I have a Bar with a yield strength of “S”n/mm^2 what torque would I expect to be able to apply before yield. So can you help me?
  17. Charon99

    Max torque a bar can be expected to support based on its tensile strength

    Racookpe1978, pi*r^3/4 = (pi*(r^3))/4 and not ((pi*r)^3)/4. If I was to write (pi*(r^3))/4 on paper I would not use the brackets or the times. If r=2.5 then pi*r^3/4 =12.27.
  18. Charon99

    Max torque a bar can be expected to support based on its tensile strength

    I’m trying to calculate the max torque a bar can be expected to support based on its tensile strength. Is the following correct:- Radius of Bar (mm)= r Moment of inertia =I=pi*r^4/4 Section modulus =z= I/r= (pi*r^4/4)/r= pi*r^3/4 Torque (Nmm)= T Tensile Strength (N/mm^2)=S T=S*z
  19. Charon99

    What is LM24 & LM6 (BS1490)

    I have searched the web looking for the UNS or ASTM equivilent of BS1490 LM24 & LM6 and can't seam to find an answer. I think LM24 is the equivalent of UNS A03800 (A380.0-F) but the mechanical properties I find on LM24 do not seam to match A380.0-F on matweb.com. And perhaps LM6 is equivalent...
  20. Charon99

    Aluminum data required. Can anyone help?

    Thanks for the help. But please excuse my ignorance, where dose the link above give me the thermal expansion coefficient?

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