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Designing for Machining A General Overview

Designing for Machining A General Overview. Holly Cheek. Overview. Typical Machined Parts Design recommendations. Typical Machined Parts. Machined parts are usually those with high accuracy specifications.

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Designing for Machining A General Overview

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  1. Designing for MachiningA General Overview Holly Cheek

  2. Overview • Typical Machined Parts • Design recommendations

  3. Typical Machined Parts • Machined parts are usually those with high accuracy specifications. • Almost always, if the part is in motion, or in contact with something in motion then machined parts are necessary. • Interchangeable parts are normally machined. • The size of machined parts varies enormously!

  4. Design Recommendations • To save on cost, avoid machining altogether! Casting and forming are MUCH cheaper. • Specify finishes and tolerances. • Design for easy fixturing and secure holding during machining operations.

  5. Design Recommendations (cont.) • Avoid sharp corners, this produces higher breakage. • Using stock dimensions eliminates the need for excessive machining operations. • Design the part strong enough to be securely clamped during the machining. • Avoid tapers and contours. • Broaching is a method used to get sharp inside corners, however expensive.

  6. Design Recommendations (cont.) • Reduce the size and numbers of shoulders. • Consider stamping a part over machining one. • Avoid hard or difficult-to-machine materials. • For parts that require surface machining, allow adequate stock for the finishing.

  7. Design Recommendations (cont.) • Try to put machined surfaces in the same plane, or at the same diameter. This will reduce the number of operations. • Provide easy burr removal from edges. • Avoid high walls, the spindle may get in the way!

  8. Homework Instructions • Due at end of class • Get into groups of two • Objective: Design a 3-D tic-tac-toe board for machining! The board that includes the most key points from the provided Design Recommendations AND has the most creative design wins! • Please be sure to include a list of the design recommendations that are incorporated into your design. HAVE FUN! This is a free-hand sketch project, only allowed ten minutes!

  9. References • http://www.omwcorp.com/how-to-design-machined-parts.html • http://www.google.com/imgres?q=stamping+metal&um=1&hl=en&biw=1600&bih=1080&tbm=isch&tbnid=g6wNzZzzyC7bvM:&imgrefurl=http://www.thomasnet.com/articles/custom-manufacturing-fabricating/precision-stamping-applications/&docid=Rz35jXgBMj71jM&imgurl=http://www.thomasnet.com/articles/image/metal-stamping-cnc.jpg&w=500&h=334&ei=enYMUKjDC5TE2QWe5rkJ&zoom=1&iact=hc&vpx=435&vpy=171&dur=3309&hovh=183&hovw=275&tx=137&ty=88&sig=110980783461520128699&page=1&tbnh=170&tbnw=228&start=0&ndsp=33&ved=1t:429,r:1,s:0,i:75

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