What are sheet metals?
Metals that are form into thin, flat pieces mostly by rolling or hammering.
What are sheet metals folded to make?
Boxes, trays and containers.
What is the size of the sheet metal use?
0.4–6mm
Another name for patterns?
Stretch-out.
Sheet metal patterns development falls into two basic classifications what are they?
Parallel-line development those that unfold into rectangular patterns.
Radial-line development unfold into triangular patterns.
What is use when cutting the layout of the sheet metal?
Snips or hang shears.
What other than metal can be use for sheet metal patterns?
Plastic or wood.
Categories of safety.
General safety, Personal safety, Machine Safety and Bench and hand tools safety.
What are THREE safety rules for hand tools?
- Chisel head must be free of burrs.
- Files need good handles.
- Use the correct tools for purpose.
What are THREE safety rules for machine?
- Never leave the machine unattended while it is running.
- Make sure machine is set at the right speed.
- Never put tools on the bed of the machine.
What information should an accident report include?
Time it took place, Place it happened and Who was impacted
What is soldering?
The method of joining metals with non-ferrous metals without having to heat them till they metal melt.
What temperature should soldering be carried out at?
700 degrees F.
Why is it called 50-50 alloy?
Because it’s 50% tin and 50% lead
What temperature 50-50 alloy melted at?
215 degree C.
What type of solder is best suited for electrical work?
60-40.
Before two metals can be joined by soldering several conditions must be met…
The correct solder alloy must be used and the surface to be soldered must be clean.
What are THREE types of available solder?
- Solid wire
- Acid or resin core wire
- Bar form
Step in procedure for safe edge?
- Mark out using odd-leg or dividers.
- Bend over at right angles using folding bars and mallet.
- Increase the angle of the bend over a hatchet stake.
- Mallet edge over a piece of waste tinplate.
- Mallet edge down on stake.
What are the steps to complete the dustpan?
- Layout all horizontal and vertical lines.
- Cut off waste materials.
- File edges to dimension.
- Make bends and folds.
- Join edges by the brazing process.
- Give finishing touches.
