Assemblies

Assemblies

EML 2023 Threads and Fasteners Lecture 1 - Nomenclature Thread Terminology EML 2023 Computer Aided Design 2 Thread Callouts - Metric

(mm) (mm) (mm) EML 2023 Computer Aided Design 3 Thread Callouts ANSI Unified 1 loosest fit 2 normal fit

3 most exact fit B represents internal thread (in) UNC UNF UNEF UN Unified National Course

Unified National Fine Unified National Extra Fine Unified National EML 2023 Computer Aided Design 4 Thread Callouts ANSI Unified (in)

Assumes course threads with a nominal fit (2). EML 2023 Computer Aided Design 5 EML 2023 Computer Aided Design 6

EML 2023 Computer Aided Design 7 EML 2023 Computer Aided Design 8 EML 2023

Computer Aided Design 9 EML 2023 Computer Aided Design 10 Goal: connect the top part to the bottom part using a #10-24 cap screw

which has a head taper of 82 must determine length of screw EML 2023 Computer Aided Design 11 Steps: buy the screw drill a countersunk hole without threads (clearance hole) into the top part

drill a threaded hole in the bottom part EML 2023 Computer Aided Design 12 EML 2023 Computer Aided Design 13

2 things to know 1. if you tap a hole the thread length should be at least twice the diameter of the fastener 2. if you use a bolt to connect some bodies the bolt should extend beyond the nut by at least two thread pitches ? e b

w cr e s e h t ld u o h s g

n o l w Ho EML 2023 Computer Aided Design 14 the major diameter of the #10 screw is

.190 the length of the screw must be at least as long as .30 + 2.19 =.68 will purchase a #10-24 screw that is .75 long EML 2023 Computer Aided Design 15

. 0 9 1 . ? e s i

b w e l e o r c h s e e

c h n t a f r o a r e l

e c t e e h m a t f i o

d r r e o j t The ma uld the diame ho s t a

h W EML 2023 Computer Aided Design 16 EML 2023 Computer Aided Design 17 Engineers Handbook

http://www.engineershandbook.com/ EML 2023 Computer Aided Design 18 EML 2023 Computer Aided Design 19

Was able to download a SolidWorks part file of this cap screw. EML 2023 Computer Aided Design 20 A clearance hole has been created for a #10 flat head screw with an 82 head taper. EML 2023 Computer Aided Design

21 A tapped hole for a #10-24 screw. The screw we selected is .75 long. Therefore the thread depth of the hole must be at least .75-.3 = .45 deep. I selected a thread depth of 0.45 and a pilot hole depth of .66. EML 2023 Computer Aided Design 22

If you only tap the blue body to the recommended depth of 2 major , i.e. .38, you will have the following. EML 2023 Computer Aided Design 23 2nd Example Problem 3/8 24 cap screw

blocks are 1.51.5.50 EML 2023 Computer Aided Design 24 2 things to remember 1. if you tap a hole the thread length should be at least twice the diameter of the fastener

2. if you use a bolt to connect some bodies the bolt should extend beyond the nut by at least two thread pitches EML 2023 Computer Aided Design 25 Determining Bolt Length EML 2023

Computer Aided Design 26 EML 2023 Computer Aided Design 27 EML 2023 Computer Aided Design

28 Bolt length calculation Bolt must be 1.988 long plus the distance of 2 extra pitches. .50 1.988 .08

21/64 The bolt has 24 threads per inch. Two extra pitches will require an extra 1/12 of an inch. Total minimum length is 1.988+0.083 = 2.071 . Find the next longest available bolt. EML 2023

Computer Aided Design 29 2 things to remember 1. if you tap a hole the thread length should be at least twice the diameter of the hole 2. if you use a bolt to connect some bodies

the bolt should extend beyond the nut by at least two thread pitches EML 2023 Computer Aided Design 30

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