Engineering Drawings: How to Make Prints a Machinist Will Love

Engineering drawings are the most important deliverables that a design engineer produces. They provide all the instructions needed to make your parts exactly as you intended. But bad drawings will make you look like a bad engineer, and parts made from them are sure to have problems. In addition, many machine shops refuse to quote jobs that have bad drawings, because nothing is more disruptive to them than having to call the engineer for missing dimensions or clarification. In this video, we give you some tips for making clear, complete drawings so you don’t embarrass yourself.

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4 Responses

  • very helpful I am taking a mechanical engineering class for my second semester and I am trying to make my drawings as professional as possible so this is very helpful keep making more videos and helpful notes.

  • On your drawing checklist and at 5:45 in the video you mention “tolerance stack”, can you define what that is? The video is great, can’t wait to see the GD&T.

    • Hi there! Every dimension of a feature has an upper and lower limit (either explicitly defined on the drawing like +.005″/-.000 or inferred via titleblock tolerances, or with GD&T). If we are designing a part and need to make sure everything will fit/work/operate/etc. together as intended, we perform a “tolerance stack” and add up all of these dimensions and tolerances to make sure that the upper and lower limits fall into the design intent. We also incorporate thermal expansion/contraction on features’ size limits. Tolerance stacks are a huge part of mechanical design and we plan on doing an instructional video since they get complicated quickly!

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