Spacing collar

The internal micrometer (Fig. 6.23) is designed for inside measurement and consists of a micrometer measuring head to which may be added external rods to cover a wide range of measurements and a spacing collar to make up for the limited range of the micrometer head. Micrometers of less than 300 mm are supplied with a handle to reach into deep holes. Each extension rod is marked with the respective capacity of the micrometer when that particular rod is used. The smallest size is... 

Micrometer head on small sizes limited to 7 and 13mm range. Extension rods and spacing collar required to extend capacity. Difficult to obtain feel Micrometer head limited to 25mm range. Interchangeable rods required to extend capacity... 

What is the purpose of spacing collars on a horizontal milling machine arbor. 

B94.31-198KR1995) Steel Rotary Slitting Knives and Steel Spacing Collars... 

Alternatively a mercury-sealed stirrer may be employed. Here again a short glass tube C is inserted through the cork of the flask to act as a collar for the stirrer. The tube C carries a short wide tube B which is either fused at its lower end to C, or is fixed to it by means of a cork as shown. The stirrer D carries a precisely similar tube E, the top of which however is now fixed to D the bore of the tube E allows it to fit easily within the annular space between the collar C and the tube B. Mercury... 

The terminal HEPA filtration module (TFM) is a self-contained HEPA filter and plenum unit (Fig. 11), which may be used to provide laminar or conventional airflow to a clean space, or may be dedicated as a LAF workstation.f The TFM is available with a 10 in. (optional 12 inch) collar for connection by a circular supply duct to a central air handling system (Fig. 5A) or as a free-standing, fully powered unit containing a motor and blower. It is normally installed in a... 

Discs with collars and other re-roll designs (Figure 133) A rather well known modification of the basic disc is the addition of a collar. The purpose of this design is to provide a separate re-roll space for pellets discharging from the main operating area of the disc. This re-roll can be used to smooth the surface of the balls, densify their outer layer, or, generally, produce a rounder shape. 

Single active zones are surrounded by glial cell processes which surround the synaptic cleft like a collar and thereby provide a barrier to the extracellular space (Figs. ID and 3). 

Fig. 6.4-38 sho vs the functional components. At the inlet on top of the equipment, the slightly pre-mixed feed components enter first a mixing and predensification screw. Pressure builds-up by the changes in shaft diameter, sometimes variable pitch of the screw flights, and by a collar at the end of the screw shaft or a pressure piece , both forming an annular space with reduced area through which the material must pass. Such a screw conveyor, mixer, and processor is often called expander. 

On the day of the experiment, 20 mL of whole blood was drawn into heparin (6 units/mL Riker Laboratories) by venipuncture from normal healthy volunteers. The saline solution was removed from the parallel-disc apparatus, and 10 mL of blood was inserted between the discs. The top disc was then rotated at 200 rpm (shear rate range 0-1200 s ) for 15, 30, or 90 min, while the entire assembly was maintained at 37°C in a free-convection incubator. The space between the top disc and the collar was less than 2 mm, to minimize blood-air contact, and a cover over the discs (not shown in Figure 2) contained a water reservoir to humidify the air over the discs and prevent drying of the blood. 

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