7mm Lewis Wood Augers with a 6.5mm Hex Shank. Available in lengths 7mm x 235mm, 320mm, 400mm, 460mm 650mm
These auger bits have one taper tap, one main cutting edge as well as a crest of thread, which is particularly suitable for soft wood and European hard wood. The mode of operation is similar to the Forstner Bit: First the taper tap will pre-cut the wood fibre of the outer cross ring, then the main cutting edge will do the main work.
The Augers are ideal for carpenters, automatic carpentry machines and anywhere where people need to drill deep holes in wood. The shafts are manufactured with a hexagonal shank, in order to avoid the shaft twisting in the machine (from diameter 10mm).
Our Lewis pattern are characterised by a milled helix. This kind of helix warrants the highest bending stiffness at maximum chip space. Therefore our Augers Bits remove the wood chips without any problems.
Auger bits can be custom made to your requirements with up to 2500mm length and 80mm diameter a feasible option.
Wood Augers/Drill Bit Information
History of the Auger Bit
Auger Bits are indispensable if you need to drill especially deep holes into wood. They have a large coiled chip space, whereby the chipped wood are carried out to the tool shank during the drilling. There are three different auger bits which differ according to the type of helix. Today, because of the universal characteristics and the modern manufacturing techniques, only the milled ‘Lewis’ auger bits are readily available.
1909 the ‘Lewis Drill Bit’: (patent since 1809) illustrated in the catalogue of the company ‘Weiss and Sohn’. The biggest difference between this and other auger bits is that the auger has a coil with a free centre and one main cutting edge.
1855 the ‘Douglas’ Auger Bit: patented in Germany, is manufactured by twisting flat bars. It has a double-thread helix, two taper taps and two main cutting edges.
1884 Drill Bit: this bit has a round central shaft with a circular spiral. Distinctive in that the helix emanated only from a main cutting edge. The spiral of the second main cutting edge ended after a half turn. Due to this trick, a very large chip space is created which transports the chips very well.
For more information on these products please contact the Swiftfix team.