PAST QUESTIONS AND ANSWERS GENERAL METAL WORK (191-1) MAY/JUNE 2005
1a.
Define Drilling
Drilling is defined as the process or method of creating or originating hole in any of the engineering materials, using the drilling machine and the drill bit.
b.
List FOUR hand operated drilling appliances
i.
Hand drill
ii.
Portable electric drill
iii.
Hand feed drill press
iv.
Back geared upright drill.
c.
Why is a drilling machine termed sensitive drilling machine?
Drilling machine is termed sensitive drilling machine because one can feel all the strains on the drill in the feed handle.
d.
Sketch a twist drill and indicate the
i.
Land
ii.
Point angle
iii.
Lip angle
iv.
Web
2a.
Outline any six protective wears in the work shop
1.
Over all
2.
Safety Boots
3.
Eye goggles
4.
Helmet
5.
Hand gloves
6.
Face shield
b.
Name Two types of tool post used on the lath
i.
Single tool post
ii.
Multi-tool post
c.
Make a neat sketch of a four jaw chuck.
3a.
Why is it difficult to harden low carbon steel?
It is difficult to harden low carbon steel because of its low carbon content.
b.
What is the differences between tempering and normalizing
Tempering as in heat treatment is done to relives internal strain in harden steel thus increases its toughness. While normalizing in heat treatment is done to relieve internal stresses in steel due to forging, machining or cold work piece.
c.
Define the following:
i.
Annealing
ii.
Normalizing
1.
Annealing: This is a heat treatment process which is used to produce softening and to improve machinability of hand or hardened steel. It relieves internal stress and strain which may be caused by machining, previous heat treatment or by cold working operations.
2.
Normalizing: Normalizing is defined as a heat treatment process which relieves internal stresses in steel due to forging, machining or cold-working.
d.
Outline the process of case hardening
Case hardening is a surface hardening process which involves hardening the thin surface layer on steel while the inner core remains quiet soft. Case hardening process actually involves two important heat treatment phases or steps. 1.
Carburizing
2.
Hardening
In carburizing, this process involves parking the component to be case hardening a carbon rich materials (container). The container placed in a finance and heated to the desired temperature. The component then removed and quench in clear water immediately.
b. Two equal distance holes are to be drilled and removed in a work-piece, briefly explain how to carry out these operations. i.
The holes are to be marked, located and centre punch
ii. Drilled the holes with the required size of drill bit. Having mounted the job on the drilling machine. 3.
Select the required size reamer (machine or hand reamer). And gradually reamed.
c.
Explain the operation, turning between centre giving simple sketch.
The operation turning between centre’s is carried out on the centre lathe.
5a.
State two differences between a flatter and a set hammer Flatter
Set Hammer
1.
Larger face
Smaller face
2.
Used for making hammered surface flat
Used to make square corners and shoulder
b.
List THREE types of forging
i. ii. iii.
Hand forging Machine forging Drop forging
c.
With a proportional sketches, describe THREE forging operations.
1.
Upsetting is a forging operation in which the cross sectional area of the material (work piece) is increased at the expense of the length.
2.
Drawing down is a forging operation in which the length of the material (work piece) is increased at the expense of the cross-sectional area.
3.
Bending: bending a straight rod in a hardy hole Bending is a forging operation in which the material or work piece are bent to form an angle, eye or you shape e.g. a rod of straight length could be bent to form an L shape as shown above.
6a. Differentiate between arc welding and gas welding with examples.
Arc welding is the fusion of two or more metals together using electricity and electrode. Arc welding is used in joining materials of thick sections. While gas welding is the fusion of two or more metals using gas (oxygen and acetylene) flame to melt or fuse the metal together. Gas welding is used to weld materials of thin sections.
b. Write briefly on the following forging processes. i.
Upsetting
ii. Drawing down iii. Twisting iv. Forming
1.
Upsetting: This is a forging operation in which the cross-sectional area of the material or work piece is increased at the expenses of the length.
2.
Drawing Down: This is a forging operation in which the length of the work piece or material is increased at the expense of the of the cross- sectional area.
3.
Twisting: This is a forging operation in which the length, cross sectional area of the material or work piece is change to form scroll, spirals or twist.
4.
Forming: Forming is a forging operation in which the shape or length of any material or work piece is change to form a different shape from the original shape e.g. the making of a ring or an eye.
Page 1 of 7. PAST QUESTIONS AND ANSWERS. GENERAL METAL WORK (191-1). MAY/JUNE 2005. 1a. Define Drilling. Drilling is defined as the process or method of creating or originating hole in any of the. engineering materials, using the drilling machine and the drill bit. b. List FOUR hand operated drilling appliances.
Tolerance: This is the difference between the upper and lower limit of any dimension. It. is the amount allowed for imperfection. e.g. Upper limit â lower = ...
The driving pin, projecting from the face plate or the lathe carrier with a bend leg into ... long work piece mounted on the head stock or between centres. iii.
If a high school student needs to obtain a general work permit during the school year, ... 1) Completed Statement of Intent to Employ Minor and Request for Work ...
Zip Code *. Hours of Operation * ... Data Synthesis and Interpretation. Policy Analysis. Other ... general work profile questions 2015.pdf. general work profile ...
shaping. The growth in sheet metal industries are increasing rapidly in market. There is. a whole new different world of such business industries today. Thus, the.
Page 4 of 214. 2018 Metal Cutting Metal Forming Metrology.pdf. 2018 Metal Cutting Metal Forming Metrology.pdf. Open. Extract. Open with. Sign In. Main menu.
shaping. The growth in sheet metal industries are increasing rapidly in market. There is. a whole new different world of such business industries today. Thus, the.
Whoops! There was a problem loading more pages. Retrying... Whoops! There was a problem previewing this document. Retrying... Download. Connect more apps... Try one of the apps below to open or edit this item. 2016 Metal Cutting Metal Forming Metrolo
on a titanium base metal with chromium top contacts to form MIM diodes. ..... obtaining a good back contact through the native oxide of the base metal remained.
There was a problem previewing this document. Retrying... Download. Connect more apps... Try one of the apps below to open or edit this item. Metal Craft.pdf.
Dec 6, 1994 - pered walls 26 and 28 is a downward facing, ?at base 34. Outer seal leg 20 also has a seal groove 36 for housing back-up elastomeric seal 38.
There was a problem previewing this document. Retrying... Download. Connect more apps... Try one of the apps below to open or edit this item. Metal Detector.
said members, as by tongue and groove en gagement 2, for easy placement and removal, are the upper coact'ing pressing heads a: and lower supporting anvil ...
There was a problem loading more pages. Retrying... Whoops! There was a problem previewing this document. Retrying... Download. Connect more apps... Try one of the apps below to open or edit this item. Industrial-Metal-A-Heavy-Metal-Guide-Reference.p
of MIM diodes to solar energy conversion is investigated. MIM diodes made ..... 2-10 Experimental Nb/NbOx/Ag MIM Diode with Argon Mill 39. 2-11. .... Background. The search for an environmentally clean and renewable energy source to.
Page 4 of 186. 2016 Metal Cutting Metal Forming Metrology.pdf. 2016 Metal Cutting Metal Forming Metrology.pdf. Open. Extract. Open with. Sign In. Main menu.
The stock's excess return* over the next tw elve m onths is ranked in the top 40% of KG I's coverage universe in the related m arket (e.g. Taiw an). N eutral (N ).
Lipsey ,R.G â An Introduction to Positive Economics . Widenfeld and Nicholson , London. Ahuja , H.L â Advanced Economic Theory. ... between Average and Marginal Propensity to Consume - Multiplier. Theory . 8. 3. Investment: Concepts of Investment
Data-to-parameter ratio = 23.6 .... Data collection: COLLECT (Nonius, 1998); cell refinement: EvalCCD (Duisenberg et al., 2003); data reduction: EvalCCD;.