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2. Bridgeport (machine tool brand) - Wikipedia

   en.wikipedia.org/wiki/Bridgeport_(machine_tool...

   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.

3. Machine taper - Wikipedia

   en.wikipedia.org/wiki/Machine_taper

   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.

4. Collet - Wikipedia

   en.wikipedia.org/wiki/Collet

   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.

5. Talk:Collet - Wikipedia

   en.wikipedia.org/wiki/Talk:Collet

   The section about R8 states: "they are self releasing and tool changes can be automated." I own a bridgeport serties 1 millibng machine with R8 Collets and I have to hammer the drawbar to release the collet. Thats common and I've seen it may time. If the collet or other tool does "self release" - its considered unaccurate/broken.

6. Milling (machining) - Wikipedia

   en.wikipedia.org/wiki/Milling_(machining)

   These mills so dominated the market for such a long time that "Bridgeport" is virtually synonymous with "manual milling machine". Most of the machines that Bridgeport made between 1938 and 1965 used a Morse taper #2, and from about 1965 onward most used an R8 taper.

7. Blaser R8 - Wikipedia

   en.wikipedia.org/wiki/Blaser_R8

   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.