VERNIER HEIGHT GAUGES
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A height gauge is a measuring device used either for determining the height of objects, or for marking of items to be worked on.
The vernier height gauges are used in metalworking or metrology to either set or measure vertical distances; the pointer is sharpened to allow it to act as a scriber and assist in marking out work pieces.
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Vernier height gauges and/or height gauges may also be used to measure the height of an object by using the underside of the scriber as the datum. The datum may be permanently fixed or the vernier height gauge may have provision to adjust the scale, this is done by sliding the scale vertically along the body of the vernier height gauge by turning a fine feed screw at the top of the gauge; then with the scriber set to the same level as the base, the scale can be matched to it. This adjustment allows different scribers or probes to be used, as well as adjusting for any errors in a damaged or resharpened probe.
Vernier height gauges come in a few different types of height gauges now. Be it a Vernier height gauges with a vernier scale, dial height gauges or digital height gauges.
The digital height gauges usually have two pillars for extra support & rigidity, and a dial to move the LED display as required.
Vernier height gauges are used mainly on a very rigid marking out table or surface plate.
SURFACE PLATE
Granite
surface plates have virtually replaced the cast iron plates which were
used before World War II because of price and maintenance costs,
corrosion (rust) resistance, superior accuracy, less response to
temperature changes, no humping when damaged by a severe blow, warp
resistance, non-seizing surface, and non-magnetic. Because of granite's
lower coefficient of thermal expansion, granite will respond less than
cast iron (steel) to temperature changes, which may distort the accuracy
of the surface plate.
PRECISION GRANITE SURFACE PLATES are made of black granite which is stronger and denser than light coloured granite, more stable, and wears longer. The granite properties determine the stiffness of the granite and accuracies can be guaranteed with less thickness than other types of granite. This translates to less freight and handling whenever the plate is shipped or moved.
MeasuMAX Granite Surface Plate include an adjustable levelling metal stand. The granite surface plate sits on 3 adjustable jacks for easy levelling.
Each plate is calibrated in a controlled environment at 20°.
A surface gauge used to be used also for marking out. In the toolroom, the distinction between a height gauge and a surface gauge is that a height gauge has a measuring head (whether vernier, fine rack and pinion with dial, or linear encoder with digital display), whereas a surface gauge has only a scriber point. Both are typically used on a surface plate and have a heavy base with an accurately flat, smooth underside.
