EML2322L-Design & Manufacturing Tips

EML2322L-Design & Manufacturing Tips - EML2322L MAE...

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EML2322L – MAE Design and Manufacturing Laboratory Design & Manufacturing Tips Following is a compilation of design & manufacturing knowledge you should accrue in this class. You should follow these rules for all parts designed and drawings submitted in this course and industry. Ask for clarification on any of these points as you work on your projects for this course. Detail Drawings 1. Finish designing the part before detailing it. This simple rule is often overlooked. Is the part ready to be “detailed” (dimensioned)? How does the part mount to the overall assembly? How do other parts attach to the part? Is there adequate room for the tools necessary to assemble the part (i.e. wrenches, sockets, screwdrivers, etc.)? Is the size of the part justified (i.e. can it be designed smaller to use less space and less raw material cost)? 2. Include necessary dimensions for every part feature. The purpose of a detailed part drawing is for someone to be able to manufacture the part without further communication with the designer . Check that every feature is dimensioned completely. Every feature requires at least two dimensions for location. If you ever find yourself dimensioning to hidden lines, you’re doing something wrong and should use an additional (section) view. 3. Include proper tolerances for each dimension. A dimension is useless without a tolerance, because the tolerance communicates the size range within which the feature geometry is acceptable. Most companies maintain a list of the typical tolerances achievable by their manufacturing facility (whether in-house or outsourced). Typical tolerance ranges for part features designed for the project in EML2322L are: ± 0.0005” to ± 0.001” for critical hole locations or sizes (i.e. dowel pin locations or holes) ± 0.002” to ± 0.005” for important hole locations (i.e. wheel hub & motor attachment bolt patterns) ± 0.005” to ± 0.020” for normal hole locations (i.e. holes to attach motor mounts to your robot) ± 0.020” to ± 0.030+” for non-important hole locations (i.e. bracket holes to arbitrarily mount a release chute motor to your robot or to specify holes through the 80/20 angle brackets) ± 0.001” to ± 0.003” for flatness specification on critical surfaces (i.e. the hub face the wheel attaches against) ± 0.020” to ± 0.050” for overall size of machined parts (this isn’t usually important to part function) ± 0.060” for (manual) sheetmetal parts produced in the lab (usually marked by eye with a tape measure and sheared) ± 0.060” for typical pieces of 80-20 cut to length (this tolerance can be achieved by cutting with the bandsaw) ± 3 to ± 5 degrees for angular bends or cuts (usually marked by eye with a protractor) Smaller (or “tighter”) tolerances require more time to produce the feature; this adds expense to a part, so always use as large of a tolerance as possible that still allows the part to perform its required function. 4.
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This note was uploaded on 10/18/2011 for the course EML 2023L taught by Professor M.braddock during the Spring '11 term at University of Florida.

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EML2322L-Design & Manufacturing Tips - EML2322L MAE...

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