Question 3
(a) (i) State threesteps to be taken when turning a piece of wood on a lathe
machine
(ii) State twosafety precautions to be taken when turning
(b) List four items that are shown on the layout of a machine shop
(c) State three steps to be taken to cross cut a board on the radial arm saw
Observation
Only a few candidates attempted this question and a large proportion of the scored
below average. The expected responses to the question are as follows.
- (i) Steps to be taken when turning a piece of wood on a lathe machine
- Cut the length allowing for waste
- Draw diagonal lines on the ends of the piece to locate centre
- Punch the centres
- Set the stock in a way it will not jam the tool rest
- Remove the corners with a gouge chisel
- Scrape the surface and turn to diameter
(ii) Safety precautions to be taken when turning
- Always stop the lathe before measuring with a caliper
- Secure the stock firmly between centres
- Wear safety goggles
- Set the stock in a way it will not jam the tool nest
- Turn the stock manually with hand to ensure everything is okay
- Always add a few drops of oil to the dead center before turning
(b) Items that are shown on the layout of a machine shop
- Machine
- Work benches
- Doorways
- Windows
- Stationary equipment
- Tool room
- Supervisor office
- Timber shed
(c) Steps to be taken to cross cut a board on the radial arm saw
- Mount a cross cutting saw on the arbor
- Adjust the radial arm to zero at right angle to the fence
- Adjust the motor so that the blade will be at right angle to the table top
- Lock the radial arm with the arm clamp handle
- Adjust the anti-kickback device
- Square the best end of the board
- Fasten a hand clamp to the fence at the right distance
- Place the stock on the table with the square end against the clamp
- Cut the exact length