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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.

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...

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...

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...

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...

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

Hi, I have a painted sheet metal, sitting on polyurethane foam. Ensure the painted surface is fully cured prior to putting on the foam. However, for some reason when lifting the sheet metal some of foam is stuck and left foam mark on the painted surface. The sheetmetal is around 1000kg and...

Hi, we have drawing, denoting welding requirement as attached. 1. Is it a correct denotation? Without weld size, what is default size to be? 2. Especially on left side where flush surface is required, this is kind of tight fit. At most there is a gap of 0.075mm or zero. What is something...

Hi, It is proposed by our casting foundry that they perform a pre-machine of the casting such that any defective parts (void, porosity, cracks) can be detected after pre-machining. At first thought, this is a good idea. Then, in my second thought, can they use any kind of detector to detect...

Hi, Our supplier machined and measured a shaft that require high precision accuracy. What they said is that they used plug/ring gauge as the zero value of CMM. And the gauge is calibrated as below Under D1564, nominal value : 60.001mm, measured value : 60.0031mm At the end, when we...