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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...

Hi, I would like to measure air quality coming from compressed air that used for CNC machine. I am wondering if there is any hand held device to measure and check if it is compliant with ISO 8573.1 Class 1.4.1. Please advise. Thanks

Hi, I would like to know the best way to set up the tube to measure cylindricity and runnout of the tube, using CMM? Their tolerance is quite tight, like 20 micron, I would like to know the best setup. Also, the measurements supplier measured using CMM does not match what we measured using...

Yeah, there was no debris. It appears the thread was not complete. We ended up cut it open in half and confirmed this. No, drawing does not specify the projected tolerance.

Hi, We have noticed that parts machined with En36A experienced elongation (or bend) after heat treatment (case hardening), whereas the dimensional change with that machined with SAE8632 (or SNCM 220) is very little. The part has a geometry of shaft. We had even spectrometer analysis...

Hi, I have a spacer with ID 8.1 (+0.2/0). If I would like to make a Go/NoGo Gauge, what should be their diameters? If we make a Go gauge being machined at 8.10, is this the correct Go gauge? Or should it be below 8.10, say 8.09 instead?

Hi, If the steel is hardened to meet the required hardness, such hardening process will prevent the parts from rust? Regards, MK