MEM 150 Fundamentals of Mechanical Prototyping Introduction Drawings Tolerances 1
Introduction 2
objectives learn to safely use standard manufacturing tools band saw hand tools drill press lathe mill cnc gain intuition for the prototyping process metrology drawings material selection fasteners tolerances operational sequences 3
20 individual parts = 1 big project grading is based upon: dimensions and tolerances finish quality punctuality other considerations: shop safety participation helping others 4
The Shop never work alone safety glasses and closed-toed shoes must be worn at all times no jewelry, baggy clothes, or loose long hair upon arrival, you need to sign in with the on-duty T if you are unsure about something, ask for help if something (a tool, machine, etc.) breaks, let us know you must clean up after yourself before leaving, get your machine(s) checked off and do a shop job 5
The Wiki http://alliance.seas.upenn.edu/~medesign/wiki 6
Drawings 7
Fundamentals Geometry show the shape of the object Dimensions provide relative lengths of features Tolerances give allowable variations for each of the dimensions Notes scale, material, finish, post processing.203 Tap 5-40 PROPRIETRY ND CONFIDENTIL THE INFORMTION CONTINED IN THIS DRWING IS THE SOLE PROPERTY OF the University of Pennsylvania. NY REPRODUCTION IN PRT OR S WHOLE WITHOUT THE WRITTEN PERMISSION OF Upenn IS PROHIBITED. NEXT SSY.250.375 SECTION - PPLICTION.500 USED ON.250 DO NOT SCLE DRWING 0.125 UNLESS OTHERWISE SPECIFIED: DIMENSIONS RE IN INCHES TOLERNCES: NGULR: MCH 1 BEND TWO PLCE DECIML.01 THREE PLCE DECIML.005 FOUR PLCE DECIML.0005 FRCTIONL 1/64 INTERPRET GEOMETRIC TOLERNCING PER: MTERIL 1/4" Sq C360 Brass FINISH Lathe/Mill R.125 4-40 UNC DRWN REVISED ENG PPR. MFG PPR. Q.. COMMENTS: NME T.250 DTE 3/17 mk 5/23.250 (.063) Slip fit for Connecting Rod TITLE: Displacer rod fork SIZE SCLE: 4:1 DWG. NO. 5 4 3 2 1 13 REV D SHEET 1 OF 1 8
Geometry Show all relevant sides of the part 9
Standard Projections U.S. custom - third angle projection (object rolling in a bowl) 10
Dimensions & Tolerances 11
Tolerances Real parts are never exactly like the drawing... (3x) Equally Spaced 4-40 UNC Thru.190 wall on 1.344 dia B.C..023 (8x).094(8x).189 1.62 1.181 +.001 1.115 -.000 SECTION - SCLE 2 : 1 UNLESS OTHERWISE SPECIFIED: DIMENSIONS RE IN INCHES TOLERNCES: NGULR: MCH 1 BEND TWO PLCE DECIML.01 THREE PLCE DECIML.005 PROPRIETRY ND CONFIDENTIL FOUR PLCE DECIML.0005 THE INFORMTION CONTINED IN THIS DRWING IS THE SOLE PROPERTY OF the University of Pennsylvania. NY FRCTIONL 1/64 REPRODUCTION IN PRT OR S WHOLE WITHOUT THE WRITTEN PERMISSION OF Upenn IS PROHIBITED. INTERPRET GEOMETRIC TOLERNCING PER: MTERIL NEXT SSY PPLICTION USED ON UNLESS OTHERWISE SPECIFIED: DIMENSIONS RE IN INCHES TOLERNCES: NGULR: MCH 1 BEND TWO PLCE DECIML.01 THREE PLCE DECIML.005 FOUR PLCE DECIML.0005 FRCTIONL 1/64 INTERPRET GEOMETRIC TOLERNCING PER: MTERIL FINISH L - 6061 T6 DO NOT SCLE DRWING DRWN REVISED ENG PPR. MFG PPR. Q.. COMMENTS: NME T DTE 3/6 mk 5/22 1.125 TITLE: SIZE SCLE: 2:1 Heat Sink DWG. NO. 5 4 3 2 1 10 REV C SHEET 1 OF 1 12
dimensions & tolerances 11/16 +.001.376 -.000.063.063 UNLESS OTHERWISE SPECIFIED: DIMENSIONS RE IN INCHES TOLERNCES: FRCTIONL 1/64 NGULR: MCH BEND TWO PLCE DECIML.01 THREE PLCE DECIML.005 FOUR PLCE DECIML.0005 bilateral +0.001 0.376-0.000 unilateral 0.376 +0.001 13
1-3/16 +.001 1.045 -.000.23 +.0000 1.1175 -.0010 (3x) Equally Spaced 4-40 UNC Thru.190 wall on 1.344 dia B.C. +.002 1.039 -.000.023 (8x).094(8x).189 1.62 3.417.09 1.181 +.001 1.115 -.000 SECTION - SCLE 2 : 1 PROPRIETRY ND CONFIDENTIL THE INFORMTION CONTINED IN THIS DRWING IS THE SOLE PROPERTY OF The University of Pennsylvania. NY REPRODUCTION IN PRT OR S WHOLE WITHOUT THE WRITTEN PERMISSION OF Penn IS PROHIBITED. NEXT SSY PPLICTION USED ON UNLESS OTHERWISE SPECIFIED: DIMENSIONS RE IN INCHES TOLERNCES: FRCTIONL 1/64 NGULR: MCH BEND TWO PLCE DECIML.01 THREE PLCE DECIML.005 FOUR PLCE DECIML.0005 INTERPRET GEOMETRIC TOLERNCING PER: MTERIL FINISH 304 Stainless Steel DO NOT SCLE DRWING ENG PPR. MFG PPR. COMMENTS: MK MK 2/24 5/22 SCLE: 2:1 ir Chamber DWG. NO. WEIGHT: 5 4 3 2 1 DRWN Revised Q.. NME DTE TITLE: SIZE 6 REV C SHEET 1 OF 1 1.125 PROPRIETRY ND CONFIDENTIL THE INFORMTION CONTINED IN THIS DRWING IS THE SOLE PROPERTY OF the University of Pennsylvania. NY REPRODUCTION IN PRT OR S WHOLE WITHOUT THE WRITTEN PERMISSION OF Upenn IS PROHIBITED. NEXT SSY PPLICTION USED ON UNLESS OTHERWISE SPECIFIED: DIMENSIONS RE IN INCHES TOLERNCES: NGULR: MCH 1 BEND TWO PLCE DECIML.01 THREE PLCE DECIML.005 FOUR PLCE DECIML.0005 FRCTIONL 1/64 INTERPRET GEOMETRIC TOLERNCING PER: MTERIL FINISH L - 6061 T6 DO NOT SCLE DRWING DRWN REVISED ENG PPR. MFG PPR. Q.. COMMENTS: NME T DTE 3/6 mk 5/22 TITLE: SIZE SCLE: 2:1 Heat Sink DWG. NO. 5 4 3 2 1 10 REV C SHEET 1 OF 1 14
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