This hollow core bit has hard cutting inserts for drilling into rock. It was used to drill and recover 50mm diameter (most common size) rock cores. The rock cores were assessed by geologists and engineers to provide information for design of structures such as tunnels, dams and underground power stations (eg. McKay Creek Power Station, West Kiewa Power Station). This type of bit was also used where damage to the surrounding rock had to be minimised. The Diamond Drill Bit,used in the early 1900's, when it was primarily used as a method of sampling rock for ore deposits and oil exploration resulting in a "coring" of rock. The use of "coring" to obtained samples for the SEC Kiewa Hydro Electricity Scheme(1920's onward) was to analyse the core to obtain temperature and rainfall patterns shown by the levels of layered solidified soil(rock). This diamond drill would have been used in the early 1900's to provide a sub strata map of temperature and water patterns (over an long period of time). This was a pre requisite to any decisions about the viability of the region to provide the water needed for a successful hydro electricity scheme.This diamond drill for core sampling was at the forefront of the analysis whether to construct a hydro electrical facility in the Kiewa Valley and the adjoining alpine region. The rock core samples produced were assessed by geologists and structural engineers. It was only after extensive core drilling covering the region that solid scientific evidence could be provided to start the "SEC Vic Hydro Electricity Scheme" within its current boundaries.This "diamond" drill bit has eight "teeth" at its cutting edge. The drill creates an 55mm hole in extremely hard rock material to obtain 50mm core samples.. Three quarters down the shank it has thread screw channels to attach the bit to the drill pipe. The coring pipe attaches via screwing it onto this bit. Core samples are the main objective of this tool.alternate energy supplies, alpine feasibility studies temperature, rainfall, sec, kiewa hydro electric scheme, electricity

Two steel spoon drill bits with a tapered proximal end, and a beveled and distorted distal end. Surface rust and paint spots.NEUMANS GERMANYchurchill island, drill bit, spoon drill bit, tool

Before drills and braces, T-shaped augers were used to poke holes into wood, while smaller gimlets were used to start them. Auger handles were usually made of a piece of hardwood that was sanded, rounded, or even contoured to give the user a firm grip. Bits on spoon augers essentially carved a hole in the piece of wood, and had to be periodically removed to clear the chips. Spiral-bit augers were precursors to modern drills, whose bits cleared the hole of chips as the user drilled. A significant advance on the auger was the brace, which was originally designed with a single, permanently fixed bit at its end. Eventually, though, braces were designed with sophisticated chucks to accommodate replacement bits, as well as bits of different sizes and for various purposes. Chucks were patented as vigorously as the braces themselves The braces themselves also evolved for particular trades, from furniture makers to surgeons. The operator holds the ‘head’ in one hand, positions the drill in the wood , applies pressure and rotates the ‘centre piece’ to cause the drill to pierce the wood. A steel revolving hand tool for boring and screw-driving with wood handles * pioneers, early settlers, market gardeners, moorabbin, bentleigh, cheltenham, brighton, tools, craftsman, carpenters, , blacksmiths, builders, farmers, metalwork, woodwork, screws

This is the cutting bit on the end of a drilling rod. It would have been used to drill holes into rock for placing explosives, for installing steel rock anchors, etc. In hard rock the bits need to be replaced regularly. Compressed air is blown through the holes near the tip of the bit to blow rock fragments out of the drill hole. The main drilling unit would have been powered by compressed air (Pneumatic). Rotary Air Blast Drilling. This drill bit was used by workers in the SEC Vic. Kiewa Hydro Electricity Scheme. This type of bit although strong needed replacing frequently when the rock composition (type of rock) was extremely compact. The configuration of the tip bit (four star like pattern) was to provide the "teeth" to tear into the rock. This bit was manufactured in 1949 however drilling for rock cores, in the Kiewa Valley and the Victorian Alps, was carried out from the late 1920's.This particular drill bit would have been used by construction workers to drill holes into rock for either explosives or for installing steel anchor points into the rock. The use of compressed air was not only for waste extraction but also for running the main drilling unit.This four star rotary air balst (RAB) drill bit has a central "blow" hole (compressed air outlet to remove the ground rock particles through four extraction holes). There are four raised cutting/grinding lugs which allows the air compression hole(incoming) to always have a clear unblock opening. Extracted ground material is "blown" out from the drill head via the larger hole created by the steel bit.Stamped on the bottom outside shank "FAGERSTA SECO SWEDEN" and below this "102 7041 01 05 049".sec vic kiewa hydro scheme, alternate energy supplies, drilling into rocks in alpine regions

Iron and wooden brace for drilling holes. The U-shaped crank has a wooden spindle on it and along with the top spindle is allowed to freely turn under the hands without producing wear and tear on the hands. A drill bit is in the chuck.brace and bit

Set of eight twist drill bits in variety of sizes and diameterschurchill island, tool, drill bit

8416.1 - Long hollow cylindrical tube capped at one end with a pointed bit and a flat ring with two short cylindrical projections sticking out. The central hollow is approximately 5cm shorter than the object itself

Pittock collection:round tin container with nine steel drill bits * eight brace and bit drill bits * one standard drill bit * container 170 mm L x 65 mm diameter Item stored in Pittock coach builder's box, reference 13000.1.

Pittock collection : various drill bit drill bits * 18 standard brace and bit drill bits of various gauges 180-95mm length * 2 odd drill bits ( one timber 21mm gauge hole 100mm length & one odd handmade "spade"bit 120mm length) * 4 threaded drill bits 75mm length Items stored in Pittock coach builders box, reference 13000.

Brace for holding drill bits for drilling holes in wood or steel, with wooden handles.tools, multipurpose, drill

Metal Brace and Bits for drilling holes with simple chuck and mushroom headstawell

Metal drill bit Length 372mmflagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village

Drill Bits (nine) Various Sizesstawell, mining

Very old. Ref. Pages 6 and 7 Tools for all Trades Catalogue. The braces vary in quality (strength) depending on what materials are used to make them.The brace is a hand operated tool for boring holes in wood, consisting of a crank-shaped turning device. The brace that grips and rotates the hole-cutting tool, the bit.Used by woodworkers in the Kiewa Valley.Vintage hand drill braces. All different and not all complete. Made of cast iron, steel with wooden handles. The drills fit into one end of the brace which is turned to make a drilling motion. A brace is a hand tool used with a bit (drill bit or auger) to drill holes, usually in wood. Pressure is applied to the top while the handle is rotated.brace and bit, woodwork, hand drilling

Wooden instrument with metal drill bit, with moveable parts

Digital Print: A digger with drill bit attached, working on the slipway at Bellfield