Machinist

[Lawrence London <lfljvenaura@gmail.com>]

MIT TechTV – Machine Shop 1
http://techtv.mit.edu/genres/24-how-to/videos/142-machine-shop-1
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Machining Skills for Prototype Development:

1) Basic
2) Layout Techniques
3) Basic Tools: Drill Press, Band Saw, Belt Sander & Grinder
4) Locating and Drilling Holes
5) Tapping Holes

duration 40:32

Comments:

Notes by Shawna 04/14/08 3:40

Machine shop 1 Machining Skills for Prototype Development

3:41 Basic 1 Intro to AI shop bridgeport milling machine grinders, buffers, polishers, deburring wheel drill press lathes bandsaw belt sander

3:45 Layout Techniques mark locations for grooves, shoulders, slots, holes

sketches-numbers for each feature you want to make "you just don't think quite as clearly in shop as elsewhere. bits of metal, tools, flying around…" sketch outside of shop=fewer mistakes.

spray surface with blue layout fluid. light coat. scratch through paint to mark surface with scribe.

simple, common tools for layout square scriber parallels-more accurate way to measure than square caliper automatic center punch compass transfer: locating bolt holes in existing part with bolt hole center punch blind holes: don't go all the way through with "heinle.." transfer punches unthreaded blind holes sheet metal: plotter

4:01 Basic Tools Drill Press: motor, transmission, drill chuck diff b/t hand drill & drill press = enough structure to hold chuck & drills perpendicular to part you are working on levers to change speed lever to feeding quill up and down by hand controls for engaging power feed work on larger parts by unlocking head and rotating it. access to much larger area. pinch clamp= up locks head in place, down releases for rotation. table has similar clamp to move table out of way. base has T slots to attach part 3-4 feet high. X-Y table add-on allows to clamp part securely, then make final adjustments using handwheels vice on table to handle smaller parts

4:06 locating and drilling holes allign spindle with center punch mark center finder: in chuck, bring it down and put end into punch hole. If there is a step b/t body and end of tool, they are not alligned. correct for this by turning feed handle to move entire bed into allignment. run fingers up and down sides of tool to check until you can't feel the transition in tool.

start drill with center drill=short and stiff. will not deflect significantly to get an accurate start to the hole. (cool little graphics tidbit showing drill bit) finish with longer drill bit.

tapping holes for threaded holes, use drill for alligment. cutting fluid for softer alloys metal/steel.

"I minimize my use because of toxicity." 4:19-end.