dme final project 200701edge.rit.edu/edge/p08005/public/dme arm...

Matthew Bradley Omar Ghani

DME Final Project 200701 Brief 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 12” in

any direction in the horizontal plane Project Binder Contents The contents of this design package include:

A brief written report summarizing work, including assumptions, description of device operation, and final results; and a short presentation selling design to the judges

CAD drawings of each component, as well as an assembly drawing Bill of Materials (dimensions, materials, supplier, catalog numbers, cost) Total estimated cost and breakdown Detailed analysis, including free body diagrams, stress and deflection analyses, and final factors of safety

for all components Design As 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.

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

Tablet remains

safely secured to

wheelchair when

deployed—set

screws and quick-

release pin ensure

no unwanted

movement.

Tablet remains

safely secured to

wheelchair when

stowed—quick-

release and dowel

pins ensure no

unwanted

movement.

1 2 3

Pull Out Pin Rotate Arm Insert Pin

The path of the mechanism should not extend past the footprint of the wheelchair by more than 12” in any direction in the horizontal plane

Assumptions All assumptions are listed in the analysis portion of the project binder. Description of Device Operation See previous page. Results Typical load factor calculation:

Minimum factor of safety: 1.769 (See calculation sheet 3e for more details) Total material cost: $169.73 (See BOM for more detailed cost breakdown)

Mechanism extends no

more than 2” past the

footprint of the

wheelchair when tablet

is deployed and no

more than 8” when

tablet is stowed.

Matthew BradleyOmar Ghani

0304-437-02 Final Project

0304-437-02 Final Project

2.50

.50

1.50

.50

.40 1.85 1.85

.25 THRU (TYP.)

R.44 (TYP. OF 2)

.75

4.50

1.25 2.00

connector plate2

ADO NOT SCALE DRAWING SHEET 1 OF 4

11/4/07MJB

UNLESS OTHERWISE SPECIFIED:

SCALE: 1:1.5 WEIGHT: N/A

REVDWG. NO.

ASIZE

TITLE:

NAME DATE

COMMENTS:

Q.A.

MFG APPR.

ENG APPR.

CHECKED

DRAWN

Machined

AluminumFINISH

MATERIAL

INTERPRET GEOMETRICTOLERANCING PER:

DIMENSIONS ARE IN INCHESTOLERANCES:FRACTIONAL 1/64ANGULAR: BEND 1/64TWO PLACE DECIMAL .01THREE PLACE DECIMAL .001

5 4 3 2 1

DME Final Project Drawing Package

200701-01

1.19.25 THRU

DRILL AND TAP FOR 1/4"-20 SET

SCREW (TYP. OF 2)

1.25 1.252.00

NOTE: ALL DIMENSIONS SAME AS PREVIOUS DRAWING UNLESSOTHERWISE NOTED.

connector plate1


11/4/07MJB


SCALE: 1:1.5 WEIGHT: N/A

REVDWG. NO.

ASIZE

TITLE:

NAME DATE

COMMENTS:

Q.A.

MFG APPR.

ENG APPR.

CHECKED

DRAWN

FINISH

MATERIAL



5 4 3 2 1


200701-01

1.70

.350

.20625

1.30 .25 THRU (TYP.)

1.2875

2.00

1.00

R.44.44

.850

uclam


11/4/07MJB


SCALE: 1:1 WEIGHT: N/A

REVDWG. NO.

ASIZE

TITLE:

NAME DATE

COMMENTS:

Q.A.

MFG APPR.

ENG APPR.

CHECKED

DRAWN

FINISH

MATERIAL



5 4 3 2 1


200701-01

2.00

2.70

R.50 (TYP.)

.35

1.00

.25 THRU1.90

90 BEND UP

.05

computer holder top flat


11/4/07MJB


SCALE: 1:1 WEIGHT: N/A

REVDWG. NO.

ASIZE

TITLE:

NAME DATE

COMMENTS:

Q.A.

MFG APPR.

ENG APPR.

CHECKED

DRAWN

N/A

.05" Al. sheetFINISH

MATERIAL



5 4 3 2 1


200701-01

1.75

5.65

0.35

0.20

6

1.29

1.30

0.70

0.35

1.00

0.25 THRU (TYP.)

90 BEND UP

90 BEND UP6.

35

0.05

2.00

D

C

B

AA

B

C

D

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MATERIAL

FINISH

.05" Al. sheet

N/A

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:

DATENAME DME Final Project Drawing Package

TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:1


A

MJB 11/4/07

SHEET 1 OF 9

computer holder clamp flat

DO NOT SCALE DRAWING

200701-02

R0.50

(TYP.)0.25 THRU

1.50

4.00

2.00

2.50

2.00 4.504.50

11.00

8.00

15.32

11.1

2

1.01

1.01 0.75

6.660

2.11

1.10

1.10

1.10

90 BEND DOWN

90 BEND UP

90 BEND UP

90 BEND UP

0.05

D

C

B

AA

B

C

D

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MATERIAL

FINISH

.05" Al. sheet

N/A

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:


TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:2


A

MJB 11/4/07

SHEET 2 OF 9

computer holder_flat


200701-02

R1.94

14.50

6.50

0.1875 THRU ALL(TYP. OF 4)

0.43750 0.18

50

90°

3.38

6.43

165.96°

4.88

1.50

16.00

0.1875 THRU ALL

0.40

0.4375

8.00

90 SLOT .1850" WIDE

D

C

B

AA

B

C

D

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MATERIAL

FINISH4130 Alloy Steel Aircraft-Grade Round Tube .875" OD, .065" Wall ThicknessAS SUPPLIED

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:


TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:2


A

MJB 11/4/07

SHEET 3 OF 9

uptube


200701-02SEE COMMENTS

18.50

1.25

3.50

0.805

90°

R1.10

I 0.60

0.4025

6.25

SEE NOTE 1

20.00

0.1870 THRUSEE NOTE 2

0.1875 THRU ALL(TYP. OF 4)

0.20

0.4025

0.40

I 1 : 1

NOTES DESCRIPTION

1End of tube to be tapered (deformed) down to O.D. of .805", corresponding to normal I.D. of this tubing; this may also be acheived by welding together two

separate peices of tubing, the smaller having an O.D. of .805"2 Minimum hole size for dowel pin as suggested by vendor

D

C

B

AA

B

C

D

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MATERIAL

FINISH

SEE COMMENTS

AS SUPPLIED

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:


TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:2


A

MJB 11/4/07

SHEET 4 OF 9

turntube1


4130 Alloy Steel Aircraft-Grade Round Tube .875" OD, .065" Wall Thickness

200701-02

8

610

16

12

18

1

92

3

14

4

17

515

7

11TOP

BACK

BOTTOM

FRONT

SCALE: 1:4

ITEM NO. PART NAME DESCRIPTION Default/QTY.1 computer ViewSonic V212 tablet 12 computer holder Custom "holster" for tablet 13 connector plate1 Rigid connection to wheelchair 14 connector plate2 Rigid connection to wheelchair 15 uptube .875" Upright tube from item 4 16 turntube1 .875" L tube from uptube 17 90145A509 Push-button quick release pin 18 98380A512 Stainless Steel dowel pin 19 9688K281 Snap-in finishing plug 2

10 computer holder top top peice of tablet "holster" 111 91385A533 1/4"-20 x .5" set screw 212 computer-tube clamp Holster-to-turntube bracket 113 uclam Custom U-clamp 114 90490A029 1/4"-20 Steel Hex Nut 1115 washer 1/4" ID Steel Washer 616 90128A242 1/4"-20X.5" Socket Cap Screw 117 91251A550 1/4"-20X2" Socket Cap Screw 618 90128A251 1/4"-20X1.5" Socket Cap Screw 4

D

C

B

AA

B

C

D

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8 7 6 5 4 3 2 1



MATERIAL

FINISH

N/A

N/A

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:


TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:2


A

MJB 11/4/07

SHEET 5 OF 9

assembly_open_exploded_new


200701-02

II

II 1.5 : 1

6

75

8

NOTE DESCRIPTION1 Tube 6 slides into tube 5 such that holes/slot line up2 Dowel pin is inserted through slot on tube 6 into hole in tube 5--use rubber mallet to ensure snug fit3 Quick-release pin is inserted into either of 2 sets of holes (thru tubes 5 and 6) to secure tubes in place4 Tubes 5 and 6 are restricted to 90 rotation from horizontal to vertical

5 To rotate, remove quick-release pin, rotate tube 6 to vertical position or until dowel pin hits the stop, re-insert quick-release pin

D

C

B

AA

B

C

D

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MATERIAL

FINISH

N/A

N/A

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:


TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:2


A

MJB 11/4/07

SHEET 6 OF 9

assembly_open_newDETAIL SHEET 1


200701-02

III

III 1 : 1.25

1016

18 12

9

13

14

2

6

NOTES DESCRIPTION1 Tablet slides into "holster" (2) from top2 Tablet is secured by attaching (10) and (12) to (2) with nut (14) and 1/2" bolt (16)3 U-clamp (13) is loosely attached to (12) with 4 nuts (14) and 4 bolts (18)4 Resulting assembly is slid over tube (6) and tightened to desired viewing angle5 Finishing cap (9) is snapped into tube (6)

D

C

B

AA

B

C

D

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MATERIAL

FINISH

N/A

N/A

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:


TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:2


A

MJB 11/4/07

SHEET 7 OF 9



200701-02

V

V 1 : 1

315

1117

5

9

NOTES DESCRIPTION

1 Connector plates (3) and (4) [not shown] are placed over wheelchair armrest upright and loosely secured with 6 nuts (14) [not shown] 6 washers (15) and 6 bolts (17)2 Tube (5) is slid into remaining tube slot3 Nuts and bolts are tightened so tubes cannot slide4 Set screws (11) are inserted and tightened to further inhibit tube slippage5 Finishing plug (9) is snapped into tube (5)

D

C

B

AA

B

C

D

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MATERIAL

FINISH

N/A

N/A

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:


TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:2


A

MJB 11/4/07

SHEET 8 OF 9



200701-02

1

IV

2

43

DETAIL IVSCALE: 1:2

DEPRESSBUTTON TORELEASE PIN

HOLES MUSTBE ALIGNED

OPERATION INSTRUCTIONSSTEP DESCRIPTION

1 Grab quick-release pin and push in top button, allowing pin to slide2 Pull out quick-release pin; laptop arm will not move

3

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 up4 Re-insert quick-release pin, and release top button to secure in place

D

C

B

AA

B

C

D

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MATERIAL

FINISH

N/A

N/A

DRAWN

CHECKED

ENG APPR.

MFG APPR.

Q.A.

COMMENTS:


TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:10


A

MJB 11/4/07

SHEET 9 OF 9

operation instructions


200701-02

Bill of Materials

Qty. Description Vendor Vendor Part # Price /unit Price ea. Line Price

11 Grade 2 Plain Steel Hex Nut 1/4"-20 McMaster-Carr 90490A029 1.42/100 0.01 0.16

11

Plain Steel SAE Flat Washer #12 Size, 1/4" ID,

9/16" OD, .051" Thk McMaster-Carr 91083A013 4.09/280 0.01 0.16

6 1/4"-20X2" Socket Cap Screw McMaster-Carr 91251A550 4.73/25 0.19 1.14

4 1/4"-20X1.5" Socket Cap Screw McMaster-Carr 90128A251 7.08/10 0.71 2.83

2 Snap-in Finishing Plug McMaster-Carr 9688K281 8.26/100 0.08 0.17

2

Alloy Stl Self-Lock Cup Point Sckt Set Screw

1/4"-20 Thread, 1/4" Length McMaster-Carr 91385A533 7.84/25 0.31 0.63

1

Type 416 Stainless Steel Dowel Pin 3/16"

Diameter, 1-1/4" Length, MIL Spec 16555-644 McMaster-Carr 98380A512 7.93/10 0.79 0.79

1 18-8 Stainless Steel Dowel Pin McMaster-Carr 90145A509 6.89/10 0.69 0.69

1 Push Button Quick-Release Pin McMaster-Carr 90293A102 14.49 14.49 14.49

1 Aluminum 3003 Sheet 12"X24"X.05" McMaster-Carr 8973K76 13.87 13.87 13.87

1 1/4"-20X.5" Socket Cap Screw McMaster-Carr 90128A242 9.94/50 0.20 0.20

1

4130 Alloy Steel Aircraft-Grade Round Tube

.875" OD, .065" Wall Thickness, 6' Length McMaster-Carr 89955K86 27.93 27.93 27.93

1

Alloy 6061 Aluminum Sheet 1.000" Thick, 8" X

8" McMaster-Carr 9246K61 55.26 55.26 55.26

Total Total

169.73 118.15

$169.73 So, maximum total cost is:

Material Info. Material Properties

Description Vendor Vendor Part # Min. TS Hardness Approx. Su (psi) Sy Treatment

Alloy 6061 Aluminum Sheet 1.000"

Thick, 8" X 8" McMaster-Carr 9246K61 95 Brinell

35,000 to

40,000 psi T6511 Temper

4130 Alloy Steel Aircraft-Grade Round

Tube .875" OD, .065" Wall Thickness,

6' Length McMaster-Carr 89955K86 ~107,000psi Rockwell C19-C26 108,900 75,000 psi

Annealed and

stress-relieved

or normalized

Aluminum 3003 Sheet 12"X24"X.05" McMaster-Carr 8973K76 40 Brinell 17,000 psi H14 Temper

1/4"-20X2" Socket Cap Screw McMaster-Carr 91251A550 170,000 psi Rockwell C37-C45 168,7951/4"-20X1.5" Socket Cap Screw McMaster-Carr 90128A251 170,000 psi Rockwell C37-C45 168,795

Description Vendor Vendor Part # Min. TS HardnessDouble Shear

StrengthPush Button Quick-Release Pin McMaster-Carr 90293A102 ~320,000 psi Rockwell C58 5,150 lbsType 416 Stainless Steel Dowel Pin

3/16" Diameter, 1-1/4" Length, MIL

Spec 16555-644 McMaster-Carr 98380A512 ~168,000 psi Rockwell C36 4,000 lbs

Note

1

Description

Min. TS, Hardness, Sy and treatment information from McMaster-Carr

Approximate TS and relevant hardness conversions from:

http://www.engineersedge.com/hardness_conversion.htm2

http://www.engineersedge.com/hardness_conversion.htm

Matthew Bradley Omar Ghani

DME Final Project 200701 Detailed Part Analysis and Calculations This package contains:

Detailed 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 Dr. Debartolo as hard-copy hand calculations.

matthewbradley_omarghani_Binder1Brief Summarymatthewbradley_omarghani_summaryA size drawingsSheet1Drawing View1Drawing View2Drawing View3Drawing View4

Sheet2Drawing View5Drawing View6Drawing View7Drawing View8



B size drawing packageSheet1Drawing View1Drawing View2Drawing View3Drawing View4

Sheet2Drawing View5Drawing View6Drawing View7

Sheet7Drawing View25Drawing View26Drawing View27

Sheet8Drawing View28Drawing View29Drawing View30Detail View I (1 : 1)

Sheet3Drawing View9Drawing View31Drawing View32Drawing View33Drawing View35

Sheet4Drawing View18Detail View II (1.5 : 1)

Sheet5Drawing View20Detail View III (1 : 1.25)

Sheet6Drawing View22Detail View V (1 : 1)

Sheet10Drawing View37Drawing View38Drawing View40Drawing View42Detail View IV (1 : 2)

McMaster Parts list_finalMaterial Properties Page

cover sheet for calculations

dme final project 200701edge.rit.edu/edge/p08005/public/dme arm...

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