VSC Blackboard Portal

Mechanical Engineering Technology

MEC 1011

Assignments

 

MEC 1011 - Design Communication I
T2&T3
Challenge 2
To be completed during our Second Meeting in week 11

As with Challenge 1, save your work in a folder named after you and located in V:\MEC\1011\Fall_10\Challenge2/Tx (where Tx is T2 or T3).

Conditions

Handle

Clevis Brackets and Anvil

Shoulder Screws

Base

Links

Acorn Nuts

Jam Nuts

Priorities

Advice

Objectives:

·         Reference the given concept sketch and further the press design documentation in order of stated priorities and with respect to given conditions.

·         Return the given concept sketch with your name on it.

Conditions:

Generally,

·         Distinguish stock dimensions (where tolerances will not apply) with the STK suffix or with parenthesis.

·         Where a custom part is based on a particular purchased geometry (such as tube, plate or angle), indicate the part number as well as the material in the material field of the title block.

·         Tolerancing should seek to accept no bad parts and reject a minimum of good ones. Pay particular attention to this screws mounting parts to the Base.

Specifically,

·         Press

Working range (block-to-anvil) of at least .75 to .5.

·         Handle

Manufactured by starting with Aluminum tube:

http://www.mcmaster.com/param/images/aluminum/unpolishedmillroundtube.gif

Part Number:  9056K273

 $35.80 Each

Top of Form

Material

Multipurpose Aluminum (Alloy 6061)

Shape

Tubes

Tube Type

Round

Finish/Coating

Unpolished (Mill)

Round Tube Type

Single-Wall

Tolerance

Standard

Wall Thickness

1/4"

Wall Thickness Tolerance

±.025"

Length

36"

Length Tolerance

±1"

Inside Diameter

1"

Outside Diameter

1-1/2"

Outside Diameter Tolerance

±.015"

Straightness Tolerance

.010" per foot

Test Report

Without Test Report

Temper

T6511

Hardness

95 Brinell

Yield Strength

40,000 psi

Temperature Range

-320° to +300° F

Application

Structural Tubes

Specifications Met

American Society for Testing and Materials (ASTM)

ASTM Specification

ASTM B241

WARNING

Hardness and yield strength are not guaranteed and are intended only as a basis for comparison.

Bottom of Form

 

Add holes for press-fit bearings where interference is at least .001 in. and at most .004 in.

Back to top

Sleeve Bearings

 

http://www.mcmaster.com/param/images/sleevebearings/sleevebearing.gif

Part Number:  2868T183

 $3.95 Each

Top of Form

Material

Bronze

Bronze Type

SAE 863 Bronze

Type

Sleeve Bearings

For Shaft Diameter (Inside Diameter)

3/4"

Inside Diameter Tolerance

+.002" to +.003"

Outside Diameter

1"

Outside Diameter Tolerance

+.002" to +.003"

Length

1-1/2"

Length Tolerance

±.010"

Load (P Max)

4,000

Speed (V Max)

225

Load at Speed (PV Max)

35,000

Temperature Range

+10° to +220° F

Specifications Met

Not Rated

Notes

Color is silver.

Bottom of Form

Back to top

·         Clevis Brackets and Anvil

Manufactured by starting with Aluminum Angle:

http://www.mcmaster.com/param/images/aluminum/unpolishedmillflatlegangle.gif

Part Number:  88805K64

 $41.73 Each

Top of Form

Material

Ultra-Corrosion-Resistant Architectural Aluminum (Alloy 6063)

Shape

90° Angles

Finish/Coating

Unpolished (Mill)

Angle Corner Type

Square

Tolerance

Standard

Thickness

3/16"

Thickness Tolerance

±.007"

Length

8'

Length Tolerance

±1"

Leg Length

2" x 2"

Leg Length Tolerance

±.024"

Straightness Tolerance

.0125" per foot

Test Report

Without Test Report

Temper

T5

Hardness

55-60 Brinell

Yield Strength

15,000 to 21,000 psi

Temperature Range

-320° to +212° F

Specifications Met

American Society for Testing and Materials (ASTM)

ASTM Specification

ASTM B221

WARNING

Hardness and yield strength are not guaranteed and are intended only as a basis for comparison.

Bottom of Form

Add mounting clearance holes for ½ in. screws.

On Clevis Brackets add a hole for a ¾ in shoulder screw (below) where clearance is at least .002 in. and at most .006 in.

Consider Insert/Feature/Hole/Simple for a hole feature.

Back to top

·         Shoulder Screws

 

http://www.mcmaster.com/param/images/shoulder/socket_knurleddim_130x90.gif

Part Number:  90298A843

1-4 Each $22.15 Each

5 or more $18.83 Each

Top of Form

Material Type

Stainless Steel

Finish

Plain

Class

Not Rated

Stainless Steel Type

18-8 Stainless Steel

Head Style

Socket

Head Diameter

1"

Head Height

1/2"

System of Measurement

Inch

Inch Thread Size

5/8"-11

Shoulder Diameter

3/4"

Shoulder Diameter Tolerance

-.002" to -.004"

Shoulder Length

2"

Shoulder Length Tolerance

±.005"

Tolerance

Standard

Thread Length

7/8"

Thread Fit

Class 3A

Rockwell Hardness

Minimum B55

Self-Locking Element

None

Hex Size

3/8"

Shear Strength

Not Rated

Minimum Tensile Strength

70,000 psi

Specifications Met

American National Standards Institute (ANSI), American Society of Mechanical Engineers (ASME)

ANSI Specification

ANSI B18.3

ASME Specification

ASME B18.3

Screw Quantity

Individual Screw

Bottom of Form

 

http://www.mcmaster.com/library/20080415/90298A843L.GIF

Back to top

·         Base

Manufactured by starting with aluminum bar:

http://www.mcmaster.com/param/images/aluminum/unpolishedmillrecsheet.gif

Part Number:  8975K334

 $34.55 Each

Top of Form

Material

Multipurpose Aluminum (Alloy 6061)

Shape

Sheets, Bars, Strips, and Cubes

Sheets, Bars, Strips, and Cubes Type

Plain

Finish/Coating

Unpolished (Mill)

Edge Type

Square

Tolerance

Standard

Thickness

3/4"

Thickness Tolerance

±.010"

Length

12"

Length Tolerance

±1"

Width

6"

Width Tolerance

±.044"

Test Report

Without Test Report

Temper

T6511

Hardness

60-95 Brinell

Yield Strength

35,000 psi

Flatness Tolerance

Not Rated

Temperature Range

-320° to +300° F

Specifications Met

American Society for Testing and Materials (ASTM)

ASTM Specification

ASTM B221

WARNING

Hardness and yield strength are not guaranteed and are intended only as a basis for comparison.

Bottom of Form

Add mounting clearance holes for ½ in. screws and counter bored from the bottom for ½ -13 lock nuts.

Back to top

·         Links

Manufactured by starting with:

http://www.mcmaster.com/param/images/stainlesssteel/unpolishedmillrecstrip.gif

Part Number:  8992K183

 $16.90 Each

Top of Form

Material

Multipurpose Stainless Steel (Type 304)

Finish/Coating

Unpolished (Mill)

Shape

Sheets, Bars, Strips, and Cubes

Sheets, Bars, Strips, and Cubes Type

Plain

Thickness

3/16"

Thickness Tolerance

+.050, -.010"

Length

36"

Length Tolerance

±3"

Straightness Tolerance

Not Rated

Width

1-1/4"

Width Tolerance

±1/8"

Tolerance

Standard

Test Report

Without Test Report

Condition/Temper

Annealed

Hardness

140 to 255 Brinell

Yield Strength

30,000 psi

Specifications Met

Not Rated

Note

Cold finished.

WARNING

Hardness and yield strength are not guaranteed and are intended only as a basis for comparison.

Bottom of Form

Add a holes for a ¾ in shoulder screws (above) where clearance is at least .002 in. and at most .006 in.

Back to top

·         Block

Manufactured by starting with:

http://www.mcmaster.com/param/images/aluminum/unpolishedmillsquarebar.gif

Part Number:  9008K461

 $20.35 Each

Top of Form

Material

Multipurpose Aluminum (Alloy 6061)

Shape

Sheets, Bars, Strips, and Cubes

Sheets, Bars, Strips, and Cubes Type

Plain

Finish/Coating

Unpolished (Mill)

Edge Type

Square

Tolerance

Standard

Thickness

1-1/2"

Thickness Tolerance

±.014"

Length

12"

Length Tolerance

±1"

Width

1-1/2"

Width Tolerance

±.014"

Test Report

Without Test Report

Temper

T6511

Hardness

60-95 Brinell

Yield Strength

35,000 psi

Flatness Tolerance

Not Rated

Temperature Range

-320° to +300° F

Specifications Met

American Society for Testing and Materials (ASTM)

ASTM Specification

ASTM B221

WARNING

Hardness and yield strength are not guaranteed and are intended only as a basis for comparison.

Bottom of Form

Add a hole for a ¾ in shoulder screw (below) where clearance is at least .002 in. and at most .006 in.

·         Acorn Nuts

Part Number: 92040A140

18-8 Stainless Steel High-Crown Acorn Nut 5/8"-11 Thread Size, 1-1/16" Width, 1-3/16" Height

http://www.mcmaster.com/library/20090804/92040A140L.GIF

Back to top

·         Jam Nuts

Part Number: 91851A645

18-8 Stainless Steel Extra-Wide Thin Hex Nut 5/8"-11 Thread Size, 1-1/16" Width, 23/64" Height

http://www.mcmaster.com/library/20060404/91851A645L.GIF

Back to top

Priorities:

1.    Complete Handle drawing with holes for press fit sleeve bearings (see specifics above).

2.    Complete Clevis Bracket drawing with 2X clearance holes for ½” screws (careful tolerancing hole locations) and a ¾” shoulder screw (see specifics above).

3.    Complete Base drawing with 6X counterbored clearance holes for ½” screws/nuts (careful tolerancing hole locations) (see specifics above).

4.    Complete Link drawing with clearance holes for ¾” shoulder screws (see specifics above).

5.    Complete drawings of remaining parts.

6.    Assembly drawing.

7.    Bonus: Approximately, how much force multiplication is achieved by your design when pressing an object from .75 to .5 inches? Present your analysis in a document with screen dumps and text.

Back to top

Advice:

·         Copy Mcmaster parts available in Challenge2 folder in your folder.

·         Work in order of priorities.

·         Don’t get distracted. There’s more information above than you need. Seek information only to satisfy priorities.

·         Keep it simple!