DME Final Project Brief Project Summary

Transcription

1 Matthew radley Omar Ghani ME Final Project 0070 rief Project Summary Objective To design a retracting mechanism for a communication board that is to be attached to a mobile wheelchair, with the following constraints: The device must provide a way to permanently install the tablet The tablet must be secured to the wheelchair when deployed for use The tablet must be secured to the wheelchair when stowed The individual must be able to stow and deploy the tablet herself The path of the mechanism should not extend past the footprint of the wheelchair by more than in any direction in the horizontal plane Project inder ontents The contents of this design package include: brief written report summarizing work, including assumptions, description of device operation, and final results; and a short presentation selling design to the judges drawings of each component, as well as an assembly drawing ill of Materials (dimensions, materials, supplier, catalog numbers, cost) Total estimated cost and breakdown etailed analysis, including free body diagrams, stress and deflection analyses, and final factors of safety for all components esign s a response to this design problem, we made sure to meet all of the design constraints. Here are the results of those efforts: The device must provide a way to permanently install the tablet Tablet can be permanently installed to device, but it can also be removed if necessary, with the removal of just one cap screw.

2 The tablet must be secured to the wheelchair when deployed for use Tablet remains safely secured to wheelchair when deployed set screws and quickrelease pin ensure no unwanted movement. The tablet must be secured to the wheelchair when stowed Tablet remains safely secured to wheelchair when stowed quickrelease and dowel pins ensure no unwanted movement. The individual must be able to stow and deploy the tablet herself Pull Out Pin Rotate rm Insert Pin

3 The path of the mechanism should not extend past the footprint of the wheelchair by more than in any direction in the horizontal plane Mechanism extends no more than past the footprint of the wheelchair when tablet is deployed and no more than 8 when tablet is stowed. ssumptions ll assumptions are listed in the analysis portion of the project binder. escription of evice Operation See previous page. Results Typical load factor calculation: Minimum factor of safety:.79 (See calculation sheet e for more details) Total material cost: $9.7 (See OM for more detailed cost breakdown)

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8 R. (TYP. OF ). THRU (TYP.) UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 RWN HEKE ENG PPR. MFG PPR. NME MJ TE //07 ME Final Project rawing Package connector plate INTERPRET GEOMETRI TOLERNING PER: MTERIL luminum Machined Q.. OMMENTS: WG. NO O NOT SLE RWING SLE: :. WEIGHT: N/ SHEET OF

9 NOTE: LL IMENSIONS SME S PIOUS RWING UNLESS OTHERWISE NOTE THRU RILL N TP FOR /"-0 SET SREW (TYP. OF ) UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 RWN HEKE ENG PPR. MFG PPR. NME MJ TE //07 ME Final Project rawing Package connector plate INTERPRET GEOMETRI TOLERNING PER: MTERIL Q.. OMMENTS: WG. NO O NOT SLE RWING SLE: :. WEIGHT: N/ SHEET OF

10 THRU (TYP.) R...80 UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 RWN HEKE ENG PPR. MFG PPR. NME MJ TE //07 ME Final Project rawing Package uclam INTERPRET GEOMETRI TOLERNING PER: MTERIL Q.. OMMENTS: WG. NO O NOT SLE RWING SLE: : WEIGHT: N/ SHEET OF

11 .0 R.0 (TYP.) 90 EN UP THRU UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 INTERPRET GEOMETRI TOLERNING PER: MTERIL.0" l. sheet N/ RWN HEKE ENG PPR. MFG PPR. Q.. OMMENTS: NME MJ TE //07 ME Final Project rawing Package computer holder top flat WG. NO O NOT SLE RWING SLE: : WEIGHT: N/ SHEET OF

12 THRU (TYP.) EN UP. 90 EN UP UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 INTERPRET GEOMETRI TOLERNING PER: MTERIL.0" l. sheet N/ O NOT SLE RWING RWN HEKE ENG PPR. MFG PPR. Q.. OMMENTS: NME TE MJ //07 ME Final Project rawing Package computer holder clamp flat WG. NO. SLE: : WEIGHT: SHEET OF 9 8 7

13 EN OWN.0 0. THRU R0.0 (TYP.). 90 EN UP EN UP EN UP.0.0. UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 RWN HEKE ENG PPR. MFG PPR. NME TE MJ //07 ME Final Project rawing Package computer holder_flat INTERPRET GEOMETRI TOLERNING PER: MTERIL.0" l. sheet N/ O NOT SLE RWING Q.. OMMENTS: WG. NO. SLE: : WEIGHT: SHEET OF 9 8 7

14 8 7.0 R SLOT.80" WIE 0.87 THRU LL (TYP. OF ) THRU LL UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 INTERPRET GEOMETRI TOLERNING PER: MTERIL SEE OMMENTS S SUPPLIE O NOT SLE RWING RWN HEKE ENG PPR. MFG PPR. Q.. OMMENTS: NME TE MJ //07 0 lloy Steel ircraft-grade Round Tube.87" O,.0" Wall Thickness ME Final Project rawing Package WG. NO. SLE: : WEIGHT: uptube SHEET OF 9 8 7

15 I : THRU SEE NOTE 0.87 THRU LL (TYP. OF ) I SEE NOTE R NOTES ESRIPTION End of tube to be tapered (deformed) down to O.. of.80", corresponding to normal I.. of this tubing; this may also be acheived by welding together two separate peices of tubing, the smaller having an O.. of.80" Minimum hole size for dowel pin as suggested by vendor UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 INTERPRET GEOMETRI TOLERNING PER: MTERIL SEE OMMENTS S SUPPLIE O NOT SLE RWING RWN HEKE ENG PPR. MFG PPR. Q.. OMMENTS: NME TE MJ //07 0 lloy Steel ircraft-grade Round Tube.87" O,.0" Wall Thickness ME Final Project rawing Package WG. NO. SLE: : WEIGHT: turntube SHEET OF 9 8 7

16 K FRONT OTTOM TOP SLE: : 7 ITEM NO. PRT NME ESRIPTION efault/ QTY. computer ViewSonic V tablet computer holder ustom "holster" for tablet connector plate Rigid connection to wheelchair connector plate Rigid connection to wheelchair uptube.87" Upright tube from item turntube.87" L tube from uptube Push-button quick release pin Stainless Steel dowel pin 9 988K8 Snap-in finishing plug 0 computer holder top top peice of tablet "holster" 98 /"-0 x." set screw computer-tube clamp Holster-to-turntube bracket uclam ustom U-clamp /"-0 Steel Hex Nut washer /" I Steel Washer 908 /"-0X." Socket ap Screw 7 90 /"-0X" Socket ap Screw /"-0X." Socket ap Screw UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 INTERPRET GEOMETRI TOLERNING PER: MTERIL N/ N/ O NOT SLE RWING RWN HEKE ENG PPR. MFG PPR. Q.. OMMENTS: NME TE MJ //07 ME Final Project rawing Package assembly_open_ exploded_new WG. NO. SLE: : WEIGHT: SHEET OF 9 8 7

17 8 7 II. : 8 II 7 NOTE ESRIPTION Tube slides into tube such that holes/slot line up owel pin is inserted through slot on tube into hole in tube --use rubber mallet to ensure snug fit Quick-release pin is inserted into either of sets of holes (thru tubes and ) to secure tubes in place Tubes and are restricted to 90 rotation from horizontal to vertical To rotate, remove quick-release pin, rotate tube to vertical position or until dowel pin hits the stop, re-insert quick-release pin 8 7 UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 INTERPRET GEOMETRI TOLERNING PER: MTERIL N/ N/ O NOT SLE RWING RWN HEKE ENG PPR. MFG PPR. Q.. OMMENTS: NME TE MJ //07 ME Final Project rawing Package assembly_open_new ETIL SHEET WG. NO. SLE: : WEIGHT: SHEET OF 9

18 8 7 0 III :. III 8 9 NOTES ESRIPTION Tablet slides into "holster" () from top Tablet is secured by attaching (0) and () to () with nut () and /" bolt () U-clamp () is loosely attached to () with nuts () and bolts (8) Resulting assembly is slid over tube () and tightened to desired viewing angle Finishing cap (9) is snapped into tube () UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 INTERPRET GEOMETRI TOLERNING PER: MTERIL N/ N/ O NOT SLE RWING RWN HEKE ENG PPR. MFG PPR. Q.. OMMENTS: NME TE MJ //07 ME Final Project rawing Package assembly_open_new ETIL SHEET WG. NO. SLE: : WEIGHT: SHEET 7 OF 9 8 7

19 8 7 V : 7 V 9 NOTES ESRIPTION onnector plates () and () [not shown] are placed over wheelchair armrest upright and loosely secured with nuts () [not shown] washers () and bolts (7) Tube () is slid into remaining tube slot Nuts and bolts are tightened so tubes cannot slide Set screws () are inserted and tightened to further inhibit tube slippage Finishing plug (9) is snapped into tube () UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 INTERPRET GEOMETRI TOLERNING PER: MTERIL N/ N/ O NOT SLE RWING RWN HEKE ENG PPR. MFG PPR. Q.. OMMENTS: NME TE MJ //07 ME Final Project rawing Package assembly_open_new ETIL SHEET WG. NO. SLE: : WEIGHT: SHEET 8 OF 9 8 7

20 8 7 IV STEP OPERTION INSTRUTIONS ESRIPTION Grab quick-release pin and push in top button, allowing pin to slide Pull out quick-release pin; laptop arm will not move Rotate laptop arm up 90 to the vertical position, or until it stops; this is easiest if laptop itself is pushed from the bottom. The holes through the tubes should be once again lined up Re-insert quick-release pin, and release top button to secure in place ETIL IV SLE: : HOLES MUST E LIGNE EPRESS UTTON TO RELESE PIN UNLESS OTHERWISE SPEIFIE: IMENSIONS RE IN INHES TOLERNES: FRTIONL / NGULR: EN / TWO PLE EIML.0 THREE PLE EIML.00 RWN HEKE ENG PPR. MFG PPR. NME TE MJ //07 ME Final Project rawing Package operation instructions INTERPRET GEOMETRI TOLERNING PER: MTERIL N/ N/ O NOT SLE RWING Q.. OMMENTS: WG. NO. SLE: :0 WEIGHT: SHEET 9 OF 9 8 7

21 ill of Materials Qty. escription Vendor Vendor Part # Price /unit Price ea. Line Price Grade Plain Steel Hex Nut /"-0 McMaster-arr / Plain Steel SE Flat Washer # Size, /" I, 9/" O,.0" Thk McMaster-arr / /"-0X" Socket ap Screw McMaster-arr 90.7/ 0.9. /"-0X." Socket ap Screw McMaster-arr / Snap-in Finishing Plug McMaster-arr 988K8 8./ lloy Stl Self-Lock up Point Sckt Set Screw /"-0 Thread, /" Length McMaster-arr / Type Stainless Steel owel Pin /" iameter, -/" Length, MIL Spec - McMaster-arr / Stainless Steel owel Pin McMaster-arr / Push utton Quick-Release Pin McMaster-arr luminum 00 Sheet "X"X.0" McMaster-arr 897K /"-0X." Socket ap Screw McMaster-arr / lloy Steel ircraft-grade Round Tube.87" O,.0" Wall Thickness, ' Length McMaster-arr 899K lloy 0 luminum Sheet.000" Thick, 8" X 8" McMaster-arr 9K... Total Total So, maximum total cost is: $9.7

22 Material Info. Material Properties escription Vendor Vendor Part # Min. TS Hardness pprox. Su (psi) S y Treatment lloy 0 luminum Sheet.000" Thick, 8" X 8" McMaster-arr 9K 9 rinell,000 to 0,000 psi T Temper 0 lloy Steel ircraft-grade Round Tube.87" O,.0" Wall Thickness, ' Length McMaster-arr 899K8 ~07,000psi Rockwell 9-08,900 7,000 psi nnealed and stress-relieved or normalized luminum 00 Sheet "X"X.0" McMaster-arr 897K7 0 rinell 7,000 psi H Temper /"-0X" Socket ap Screw McMaster-arr 90 70,000 psi Rockwell 7-8,79 /"-0X." Socket ap Screw McMaster-arr ,000 psi Rockwell 7-8,79 escription Vendor Vendor Part # Min. TS Hardness ouble Shear Strength Push utton Quick-Release Pin McMaster-arr 9090 ~0,000 psi Rockwell 8,0 lbs Type Stainless Steel owel Pin /" iameter, -/" Length, MIL Spec - McMaster-arr 9880 ~8,000 psi Rockwell,000 lbs Note escription Min. TS, Hardness, S y and treatment information from McMaster-arr pproximate TS and relevant hardness conversions from:

23 Matthew radley Omar Ghani ME Final Project 0070 etailed Part nalysis and alculations This package contains: etailed analysis, including free body diagrams, stress and deflection analyses, and final factors of safety for all components Note: This section of the design package was handed in to r. ebartolo as hard-copy hand calculations.