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This manual consists of carpentry, fitting, machine, welding, tinsmitthy, forging shops
Typology: Exercises
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SRI VENKATESWARA COLLEGE OF ENGINEERING & TECHNOLOGY (AUTONOMOUS) Accredited by NBA, New Delhi & An ISO 9001:2000 Certified Institution Approved by AICTE, New Delhi, Affiliated to JNTU, Anantapur RVS Nagar, Tirupathi Road, Chittoor - 517127. (A.P) www.svcetedu.org.
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SRI VENKATESWARA COLLEGE OF ENGINEERING & TECHNOLOGY (AUTONOMOUS)
I B. Tech- II Semester L T P C
0 0 3 2 (14AME03) ENGINEERING WORKSHOP Lesson plan for the academic year 2014- (Common to CE, ME Branches)
Objectives:
After completion of the study of this lab a student will be able to:
Reference Books:
1. Work shop Manual / P.Kannaiah/ K.L.Narayana/ SciTech Publishers. 2. Engineering Practices Lab Manual, Jeyapoovan, Saravana Pandian, 4/e Vikas 3. Dictionary of Mechanical Engineering, GHF Nayler, Jaico Publishing House.
SL. NO TRADES FOR EXERCISES: NO.OF. HRS. REQUIRED
CUMULATIVE HRS A Carpentry shop
3 21
Lab incharge H.O.D
Wood work or carpentry deals with making joints for a variety of applications like door frames, cabinet making furniture, packing etc., Timber:- Timber is a name obtained from well grown plants or trees. The timber must cut in such a way that the grains run parallel to the length. The common defects in timber are knots, wet rot, dry rot etc., Market sizes of timber:- Timber is sold in market in various standard shapes and sizes. They are:- Log:- The trunk of a tree, which is free from branches. Balk:- The log sawn to have roughly square cross section. Post:- A timber piece, round or square in cross section with more than 275 mm in width, 50 to 150 mm in thickness and 2.5 to 6.5 mts length. Board:- A sawn timber piece, below 175 mm in width and 30 mm to 50 mm in thickness. Reapers:- Sawn timber pieces of assorted and nonstandard sizes, which don’t conform to the above shapes.
Carpentry vice:- It is a work holding device. When handle vice is turned in a clockwise direction, the sliding jar forces the work against the fixed sawn. The greater the force applied to the handle, the tighter to the work held. Bar clamp:- It is a rectangular (or) square block with V-groove on one or both sides opposite to each other. It holds cylindrical work pieces. C-Clamp:- This is used to hold work against an angle plate or V-block.
Try square:- It is used for marking and testing the square ness of planed surfaces. It consists of a steel blade, fitted in a cast iron stock. It is also used for flatness. The size of a try square usedfor varies from 150 mm to 300 mm, according to the length of the blade. It is less accurate when compared to the try square used in fitting shop.
Marking gauge:-
It is a tool used to mark lines parallel to the edges of wooden pieces. It consists of a square wooden stem with a riding wooden stock on it. A marking pin, made of steel is fitted on the stem. A mortise gauge consists of two pins. In these it is possible to adjust the distance between the pins, to draw two parallel lines on the stock. Compass and dividers :- This is used for marking circles, arcs, laying out perpendicular lines on the planed surface of the wood.
CUTTING TOOLS: Hack saw:- It is used to cross cut the grains of the stock. The teeth are so set that the saw kerfs will be wider than the blade thickness. Hard blades are used to cut hard metals. Flexible blades are having the teeth of hardened and rest of the blade is soft and flexible. Chisels:- These are used for removing surplus wood. Chisels are annealed, hardened and tempered to produce a tough shank and a hard cutting edge. Rip saw:- It is used for cutting the stock along the grains. The cutting edge of this saw makes a sleeper angle about 60o whereas that saw makes an angle of 45o with the surface of the stock. Tenon saw:- It is used for cutting tenons and in fine cabinet works. The blade of this saw is very thin and so it is used stiffed with back strip. Hence, this is sometimes called back saw. The teeth shapes similar to cross cut saw.
DRILLING AND BORING TOOLS: Auger bit:- It is the most common tool used for boring holes with hard pressure. Gimlet:- This is a hand tool used for boring holes with hand pressure. Hand drill:- Carpenters brace is used to make relatively large size holes, whereas hand drill is used for drilling small holes. A straight shank drill is used with these tools. It is small light in weight and may be conveniently used than the brace. The drill is clamped in the chuck.
Fig: 9 cross cut saw Fig: 10 Tenon saw Fig: 11 compass saw
Fig: 12 Chisels Fig: 13 Carpenter’s brace Fig: 14 Auger bit
Fig: 15 Gimlet Fig: 16 wood rasp file Fig:17 Mallet
Fig: 18 Hand drill Fig: 19 Trammel Fig: 20 Claw hammer
Aim: - To make a T- lap joint
Tools required: -
Material required: - Wooden pieces of size 50 x 35 x 250 mm–2 Nos.
Sequence of operations: -
Aim: - To make a Dovetail lap joint from the given reaper of size 50 x35 x250 mm.
Tools required: -
Material required: - Wooden pieces of size 50 x 35 x 250 mm–2 Nos.
Sequence of operations: -
Machine tools are capable of producing work at a faster rate, but there are occasions when components are processed at a bench. Sometimes it becomes necessary to replace or repair a component that must fit accurately with one another or reassemble. This involves a certain amount of hand fitting. The assembly machine tools, jigs, gauges etc., involves certain amount of bench work.
FITTING TOOLS: Holding tools:-
^ Bench vice^ V-block with clamp C-clamp Bench vice:- It is a work holding device, when vice handle is turned in a clockwise direction the sliding jaw forces the work against the fixed jaw, the greater the force applied to the handle, the tighter is the work held. V-block with clamp:- It is a rectangular (or) square block with v-groove on one or both sides, opposite to each other. It holds cylindrical work pieces. C-clamp:- This is used to hold work against an angle plate or v-block. MARKING AND MEASURING TOOLS:
Fig: 1 Bench wise Fig: 2 V- Block
Fig: 3 C – Clamp Fig: 4 Surface plate
Fig: 5 Angle plate Fig: 6 Dot punch
Fig: 6 try square Fig: 7 scriber
Fig: 8 odd leg clamp and divider
Fig: 9 calipers Fig: 10 Vernier caliper
Fig: 11 Parts of hand file
Fig: 12 Types of files Fig: 13 ball peen hammer
