G Cramps are an essential tool in the workshop and they come in a range of sizes and are generally used for clamping work securely to a surface/workbench top. They can also be used to hold parts together whilst glue is drying.
The clamp is tightened by turning the small tommy bar which turns the threaded rod. Some G Cramps have a wing nut in place of the bar making it easier to turn by hand. However, if a tommy bar is used more pressure can be applied to the thread in order to tighten the clamp.

The thread of a G Cramp is made from hardened and tempered steel which means it is quite resistant to wear. The frame is normally made from drop-forged steel.

Diagram 1 shows how a piece of material is clamped down using a G Cramp during drilling. Material should never be held in the hand because it can spin at high speed if the drill bit jams . The G Cramp holds the material down safely.

Diagram 2 shows a G Cramp used to secure a piece of wood to a bench so that a chisel can be used on it. This is essential as chisels are very sharp and if the wood were to move the chisel could slip, causing a serious accident.

QUESTION : With the aid of diagrams and notes, explain how a G Cramp can be used to secure material when using a drilling machine.