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

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...

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...

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?

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

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...

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.

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..

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

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...

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...

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

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...

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.

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...

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...

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

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...

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...

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...