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The R8 system is commonly used with collets ranging in size from 1 ⁄ 8 ″ to 3 ⁄ 4 ″ in diameter or tool holders with the same or slightly larger diameters. The collets or tool holders are placed directly into the spindle and the drawbar is tightened into the top of the collet or tool holder from above the spindle.
Several machine collets (top and centre) and a dismantled pin chuck (below). Generally, a collet chuck, [3] considered as a unit, consists of a tapered receiving sleeve (sometimes integral with the machine spindle), the collet proper (usually made of spring steel) which is inserted into the receiving sleeve, and (often) a cap that screws over the collet, clamping it via another taper.
The Blaser R8 straight-pull bolt action locks by a 14-lug radial collet in a 360 degrees groove in the barrel and is designed to withstand pressures significantly exceeding the Mauser 98–type bolt-action rifles. The bolt is symmetric and self-centering, providing a basis for increased accuracy.
Machine tapers for tool holding included Morse tapers (on early models) and the R8 taper (a widely used standard that Bridgeport created) on most models. Both Morse and R8 allowed for both collets and solid holders, and a drill chuck could be held by either of the latter. Currently R8 and Erickson #30 Quick Change tool holders are available.
The Blaser R8 displays an enlarged locking surface of 96 mm 2 (0.149 in 2) compared to 66 mm 2 (0.102 in 2) of the R93. [11] While the R93 collet has a locking angle of about 50 degrees, the angle of the R8 has been steepened to almost 90 degrees. Further the radial collet opens differently.
An exception is the ER collet which typically has a working range of 1 mm (about 0.04 in). Collets usually are made to hold cylindrical work, but are available to hold square, hexagonal or octagonal workpieces. While most collets are hardened, "emergency" collets are available that can be machined to special sizes or shapes by the user.
An uncommon part of its design is that it is a straight-pull bolt-action rather than a turn-bolt, which allows for much faster follow-up shots. The 14-lug radial collet ensures the centering of the cartridge when fed into the chamber assisting in its accuracy. Barrel changes by an experienced person can take place in under 60 seconds.
The whole of the drill bit, shaft and shank, is usually of the same diameter. It is held usually in a three-jaw drill chuck. Bits of diameter too small to grip firmly can have straight shanks of larger diameter than the drill, which can be held firmly in a standard size collet or chuck. Large drill bits can have straight shanks narrower than ...
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