From DT Online
Planishing,is a process used to true and smooth out the surface of Beaten Metalwork items formed previously by Hollowing, Seaming or Raising for example. The process involves striking the metal surface with a highly polished Planishing or Collet Hammer whilst it is held firmly against the surface of a highly polished Planishing Stake. This imparts a polish on to the beaten metal surface and also Work Hardens the previously Annealed sheet.
Stakes are available in a wide variety of shapes and sizes. They are usually made of Cast Iron but can be self-made from Mild Steel for example. Typically, Planishing Stakes are broadly mushroom shaped with varying degrees of curvature and one is chosen which most closely matches the curvature of the item to be Planished but is a slightly tighter curve.
- 12oz Hammers (0.45kg) are a good useful size for general work in Design and Technology.
- Larger 2lb hammers (1kg) are used for heavier work such as Blacksmithing for example.
- Smaller hammers (e.g. 4oz and 8oz) are suitable for jewellery work and model engineering applications.
- Brick Hammers between 1lb and 1.5lb weight (450g to 700g) are suitable for school use and are available also with a Scutch Comb Chisel at one end which can be used for shaping brick and masonry.
- A 2lb Lump Hammer (0.9kg) is a good useful size for general work in Design and Technology and home maintenance tasks.
- 2lb to 4lb Sledge Hammers (1-2kg) are a suitable size for general forge-work in Design and Technology since hammers heavier than 4lb would be difficult for students to use.
|Ball Pein Hammer||Blacksmiths Hammers||Brick Hammer||Claw Hammer||Cross Pein Hammer||Lump (or Club) Hammer||Pin Hammer||Sledge Hammer|
- Traditional Boxwood Mallets are now largely superceded by Nylon, PVC or rubber faced hammers and mallets for general work. They are available in a range of diameters and weights.
- Carpenters' Mallets with a head size of 4-5 inches (100mm - 125mm) are a suitable size for most work in Design and Technology.
- Carving Mallet heads are commonly made from Beech but Lignum Vitea heads are considered better because they are heavier. They may now be hard to find. A modern alternative is to use Polyurethane for the heads (Bronze or Brass also used). A good general size head weight for light work would be approximately 450 grams or less, and for general work, 800 grams is more suitable.
- Bossing Mallets are sized by head diameter (35, 50, 60, or 75mm). The smaller sizes are used for art metalwork and the larger sizes are for shaping and stretching sheet metal and soft roofing materials such as lead.
|Nylon Hammer||Rubber Mallet||Carpenters Mallet||Carvers Mallet||Rawhide Mallet|