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  1. Yuyu28

    Using a complex blade surface as datum feature

    I understand. I think it should be large enough for that purpose, but I'll keep it mind, thank you. I was still referring to the aerodynamic surface. With "giving up" on it I meant not identifying the aerodynamic surface with datum feature symbol A under the profile tolerance (as opposed to...
  2. Yuyu28

    Using a complex blade surface as datum feature

    I am just seeing the posts that were written while I was typing my latest one. I will probably have to come back tomorrow to answer all of you. Unfortunately, no, they haven't implemented that yet. Which rotational DOF do you mean, for the aero surface or for the holes? Regarding purchasing...
  3. Yuyu28

    Using a complex blade surface as datum feature

    chez 311, Thank you for you clear explanations. I will discuss them with the reviewer when the time comes. For now, giving up on using the aerodynamic surface as a datum feature, suppose I define three datum targets A1, A2, A3 on that surface. They would determine a datum plane A. Datum plane...
  4. Yuyu28

    Using a complex blade surface as datum feature

    Thank you all for your answers, and apologies for the late reaction. When you all talk about the mounting surface, what exactly do you refer to? Would it be the surface on which the blade is positioned in order to check the tolerances? If so, could the bottom half of the mold used as a mounting...
  5. Yuyu28

    Using a complex blade surface as datum feature

    Hello all, Imagine a carbon-fiber rotor blade that is manufactured by laminating the layers on an inner mold, and cured inside an outer mold that will determine the outer, complex aerodynamic surface. The blade is then trimmed at the root and at the tip, forming two planes that, theoretically...
  6. Yuyu28

    Defining a datum in a 2X detail view

    Thank you again, chez, you were very helpful!
  7. Yuyu28

    Defining a datum in a 2X detail view

    Sorry I haven't answered before, but thank you for your replies. chez, I agree that the sliver at the end is too small and probably something like the <CF> modifier should be used. I just wanted to focus the question on the issue of defining a datum in a detail view. From the ISO standards that...
  8. Yuyu28

    Defining a datum in a 2X detail view

    I have the following drawing of the grooves on a shaft that hold retainer rings. I know it is not fully constrained, but that is not relevant to the question. Context: a) FUNCTION: The shaft fits with clearance into two holes to constrain two other parts radially. The axial movement is...
  9. Yuyu28

    Is the ISO fit G8/k5 combination allowed?

    dgallup, I intend to design the hole with a clearance fit for the bushing. You're right that there's some interference at MMC; I can then reformulate the question with an ISO tolerance of F8 (8 +0.035/+0.013), but the combination F8/k5 still seems uncommon. My question is focused on finding...
  10. Yuyu28

    Is the ISO fit G8/k5 combination allowed?

    My apologies if this is not the correct forum to post this. I have a bushing of 8mm nominal OD that requires an ISO tolerance of k5 (8 +0.007/+0.001) to fit into a bearing; this is a given data. I am designing another clearance hole to house the bushing outside the bearing, and I am doubting...
  11. Yuyu28

    What is a &quot;datum line&quot;?

    Burunduk, chez311, apologies for my silence; I read you at work so I don't want to take too much time from it. I still like to clarify unanswered questions, so here it goes: You were right that the beam is not floating; I was missing a part of the assembly. The beam is indeed clamped on plane...
  12. Yuyu28

    What is a &quot;datum line&quot;?

    chez311, The not shown holes are positioned in the same direction and through the same surfaces as the ones shown. Their axes are perpendicular to datum feature A and located at the sides of the beam farthest from the symmetry plane of the part, roughly below the leader of datum C symbol...
  13. Yuyu28

    What is a &quot;datum line&quot;?

    Burunduk, chez311, thank you for your discussion. I can't add anything useful to it but I am learning a lot from your posts. I will let you know what we settle for once the part has been reviewed and released. I don't like leaving questions unanswered, so... My drawing is a simplification of...
  14. Yuyu28

    What is a &quot;datum line&quot;?

    Thanks for all the answers, and apologies for not opening a new thread; I'm new to the forum so I'm not familiar with the customs. My perspective with this was like Burunduk's that, in practice, it might be easier to measure from the edge even if it's not perfect. But I guess that's a decision...
  15. Yuyu28

    What is a &quot;datum line&quot;?

    Sorry for reviving this old (but interesting thread). I wonder if the use of datum target lines as in Fig. 9-16 applies to an example like the following: To position the holes horizontally, I need some datum plane perpendicular to the plane of the view. I see two alternatives: a) using one...

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