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  1. Mannes Karsten

    General tolerances on a drawing

    @Wuzhee: Thank you. I think it's indeed something along those lines. One of our suppliers interpreted the 'fabricating' general tolerances as tolerance for the final assembly. And now the assembly doesn't fit due to the large tolerances specified in the 'fabricating' column.
  2. Mannes Karsten

    General tolerances on a drawing

    @Wuzhee: Can't post a picture, best I can do is show a resemblance of the table: The values in above table are irrelevant/made up. But this is a resemblance of the general tolerances table on the drawing. I'm looking for what the 'fabricating' column refers to. Can't ask the guy who drew it...
  3. Mannes Karsten

    General tolerances on a drawing

    Hi, Quick question; On an old rotor assembly drawing we received, there's a table with general tolerances ('unless otherwise specified'). Now in this tolerance table there are 3 columns: Machining, fabricating, casting. I only know certain ISO-norms, such as ISO 2678-mK. I'm unfamiliar with...
  4. Mannes Karsten

    Standard for rounded keys

    The thought here at the office is that indeed the keys are placed for radial positioning only.
  5. Mannes Karsten

    Standard for rounded keys

    Main transfer of torque comes from the impellers being shrink fitted onto the shaft. I'm also starting to think that there's no standard for these types of keys.
  6. Mannes Karsten

    Standard for rounded keys

    Jboggs; the impellers have pretty decent shrink on them. The bore is at around 100mm. The shrink is 1,5 promille (not sure if that's the correct word in English, but 0/00%). Main purpose isn't to transfer torque. Seems like more of a back-up than anything else. Flat bottom key exactly. Hub of...
  7. Mannes Karsten

    Standard for rounded keys

    Oh, I'm sorry. My native language isn't English. I meant by oval the rounded top of the key. Here the scan that was made:
  8. Mannes Karsten

    Standard for rounded keys

    Thanks for the replies. The reccuring question here of why would you use an oval key is pretty much the same question we have here at the office. The impellers will be shrink fitted onto the shaft so the transfer of torque won't be totally dependant on the key. These keys don't control the...
  9. Mannes Karsten

    Standard for rounded keys

    Hi, I'm unable to find a standard concerning rounded keys. As seen by the image, the top part of the key is also rounded. Meaning the keyway in the hub has a rounded contour instead of a rectangular contour. I'm reverse engineering a shaft with impellers that have these rounded keyways...
  10. Mannes Karsten

    Metric standard for 2 keyways in a shaft (180 degrees apart)

    I'm reverse engineering an impeller, and the shaft has 2 keyways in it. Which, I agree, isn't a good idea and is troublesome to get precisely correct.
  11. Mannes Karsten

    Metric standard for 2 keyways in a shaft (180 degrees apart)

    Hello, Does anyone know if there's a metric standard for a shaft that has 2 keyways, spaced 180 degrees apart, but both in the same axial place on the shaft. I'm looking for general tolerances and stuff (if there's any). Thank you.
  12. Mannes Karsten

    Rectangular piping - flanges

    Casing will be tested with a 6-bar atmospheric pressure. I'm actually not sure if this is even sufficient information as designing pipework normally isn't in our scope, so excuse my 'ignorance'.
  13. Mannes Karsten

    Rectangular piping - flanges

    Hi everyone, We're engineering a compressor for a chemical plant. The compressor has a rectangular exhaust pipe, which by a conical nozzle turns into a 20" piping system. The rectangular exhaust has a width of 410mm x 260mm height. The idea is to create a spool piece at the rectangular exhaust...
  14. Mannes Karsten

    Shrink fit (thread on part)

    Hi, Trying to figure out how much thread will deform during shrink fit. We're reverse engineering shaft sleeves for a compressor rotor and 2 of the sleeves have thread on them. Bore diam. is around ∅110mm - thread is 4 1/2" - 12 UN (external) Will the thread be viable if we were to design it...

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