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  1. dogbural

    Stress relieving on SS316

    What would be your recommendation to maintain the same properties? Should use oil? For how long?
  2. dogbural

    Stress relieving on SS316

    Supplier actually confirmed the process as below Placing the SS tubes for 3 hours (this is a stage where the temperature ramps up to 980 deg) Open the furnace and cool it down for 17 hours I have not checked with raw material supplier as to how they do quenching. It seems believe or not, the...
  3. dogbural

    machining a long tube (380mm)

    Hi, Our supplier have to machine a long tube (OD: 55, ID: 53, Length 380mm) from thicker tube (OD 58, ID 50) They use a CNC lathe machine and when they machine ID, they machine from both ends - machine one end and flip it for the other end. It is apparent to see the a little bumpy line at the...
  4. dogbural

    MMC to a diameter

    Hi, I am not familiar with this "M" maximum material requirement. Given the drawing like below, I understand that if OD is machined at 40.5mm, we can apply 0.06 runout. (and at 40.53mm, apply 0.03 runout). How do I calculate if the OD is at 40.51mm, what total runout tolerance should be applied?
  5. dogbural

    Stress relieving on SS316

    Hi, If the extruded SS 316 tube is stress relieved at the following condition, can we expect to have any hardness change? - furnace @980 deg Celsius for 20 hours - cool by air
  6. dogbural

    soldering (dry joint)

    Hi, Is it a common observation that when the electrical parts are soldered but their quality is bad, it could still work at the beginning but eventually it will intermittently be failed? If the parts were soldered very well, does it still get failed due to transportation vibration or...
  7. dogbural

    profile tolerance for chamfer and radii

    Hi, The profile tolerance can cover the general chamfer and radii tolerance? The drawing used to have general tolerance for chamfer and radii but now they are removed and asked to refer to general profile tolerance.
  8. dogbural

    Acetal (POM) against Anti Rust Oil

    the part we have consists of acetal and metal. And noticed the metal is being rust. I just want to be cautious if we can apply the anti rust on the assembly. it is most likely that acetal will be oiled..
  9. dogbural

    Acetal (POM) against Anti Rust Oil

    Hi Is it okay to apply anti rust oil on the acetal material?
  10. dogbural

    HT300 casting material - normalisation and tempering

    Hi, One of the requirements in the casting drawing is that after casting with HT300 material (equivalent to GC40), the casting shall be normalised and tempered. I guess this is due to increase tensile strength. Q1. Is it a common practice in casting industry? Q2. Is it really possible to do...
  11. dogbural

    stud weld - continuous breakage

    supplier just confirmed that the parts are plated after weld. Stud is made of copper. Supplier advised that the possible reason for the broken stud is due to the stud being slanted during welding process. Every round of torque testing/ tightening process, the force that applied at the slanted...
  12. dogbural

    stud weld - continuous breakage

    thanks guys, I will have discussion with our eng team.
  13. dogbural

    stud weld - continuous breakage

    Hi all, M6x20 stud on zinc plated steel grade 250 (thickness 2mm). Supplier apply 5.71Nm according to ISO 898/1, while we apply 4Nm. 3DDave mentioned hammering to 90 degree as a typical test. Do you think this is better than checking with a torque? now supplier propose a self-clinching...
  14. dogbural

    stud weld - continuous breakage

    Hi desertfox Actually it broke off at the welded point. They checked it with a torque of 5 while we apply 4.5nm. What would be the possible reason? Contamination on welded surface? Or just poor welding? It does not happen all the time but happens time to time.
  15. dogbural

    stud weld - continuous breakage

    Hi, I have a plate with studs welded. Some of the studs ended up breakage while applying torque. Looking at the broken face, would it be any possible cause for this failure? Supplier also checked the parts by applying the torque. In their end, the parts are all conforming. But sometimes, we...
  16. dogbural

    PCD tolerance wrt true position

    Hi, I have question on tolerance of PCD Dia 225 with profile tolerance of 0.2mm. When drawing specifies the true position tolerance of Dia 6.2 holes at 0.1mm (+0.05), do we still need to measure PCD Dia 225? If so, do we still need to apply 0.2mm tolerance...
  17. dogbural

    Anti rust product comparison

    attachment for G15 datasheethttps://files.engineering.com/getfile.aspx?folder=8788398f-602c-4566-9fb6-7c1f8808adb2&file=G15-FERRO-PAK-RUST-PREVENTATIVE.pdf
  18. dogbural

    Anti rust product comparison

    Hi, I have two anti-rust products. This (G-15 Soft film rust Inhibitor oil) is what we currently use but due to shortage we need to find alternative. This (CRC Soft seal heavy film) was only available. I would like to what I should compare to see the alternative is okay for use...
  19. dogbural

    crimping issue

    my bad - when i said a different hole size, i meant the side hole - please see photo. Otherwise they are quite identical. We tested them with the same crimping tool. For the bad pins, we even sized the setting to get it right but no luck. I just wanted to know how it make the crimping...
  20. dogbural

    crimping issue

    Hi, I have identical sized pin connectors, only difference is the hole size, which I believe nothing to do with crimping quality. Once I crimped them, they turned out to be different. Please see attached image. What could be the cause of the poor crimping? Pin connector's material...

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