SRJC, ENGR45, 2012 The Nuts and Bolts behind …yataiiya/E45/PROJECTS/NUTS-BOLTS.pdfHISTORY OF BOLTS...
Transcript of SRJC, ENGR45, 2012 The Nuts and Bolts behind …yataiiya/E45/PROJECTS/NUTS-BOLTS.pdfHISTORY OF BOLTS...
By Albert Curutchet and Shiphra Seera
The Nuts and Bolts behind Engineering
SRJC, ENGR45, 2012
HISTORY OF BOLTS Nuts and bolts were invented
in as early as the 1st century,
The Romans used them to bind windows, secure chariots and build machines.
In as early as the 1400’s, Leonard DaVinci and Luc Besson had designs of bolts
The first nuts and bolts had square heads unlike the one used today that are hexagonally shaped.
The first bolts were handmade.
ANOTOMY OF BOLTS AND THREADS
Type of heads
Grip
Thread pitch
Length
Chamfer
Thread length
diameter
TAPPING
The process of running a tap in a blank hole in order to cut threads.
Process
Direction we wanted to go
To check the amount of torque required to pull thread for ½ inch 836 steel.
Then re-tapped with common thread repair kits
Bolts failed and change the process
Then proceeded with grade 8 bolts pulling different amount of threads
Direction we ended up going
We used a torque wrench to measure the amount of force a grade 5 and grade 8 bolt can take before it failed critically.
Analysis of torque on the bolts.
Grade 5 bolt Grade 8 bolt
•Torque value: 67 ft.lb •Torque value: 90 ft.lb
WHEN COMPARED TO THE THEORETICAL RESULTS….
OUR RESULTS WERE MUCH GREATER THAN THE THEORITCAL VALUES!!?!!
GRADE 5 BOLT
3/8 inch bolt tightening torque is 31ft/lb
GRADE 8 BOLT
3/8 inch has tightening torque of 44ft/lb
THEORITCAL VALUES
•We tested effect of pressure on grade 8 bolt.
•The bolt was compressed at 7000psi to get to this point (as shown in picture)
•Tried to de-thread a nut.
WE ALSO!!!
HOW BOLTS ARE MADE
SOURCES
"Bolt Torque Chart." Anchor Bolts and Construction Fasteners. N.p., n.d. Web. 04 Dec. 2012.
"Components Diagram." Racing Bolts Components. N.p., n.d. Web.
"History of Nuts and Bolts." History of Nuts and Bolts. N.p., n.d. Web. 04 Dec. 2012.
YouTube. YouTube, n.d. Web. 04 Dec. 2012.
"Nut Bolt Fastener Bearings." Rupali Enterprises. N.p., n.d. Web. 04 Sept. 2012.