Length Gauge

Length Gauge

 

a device for measuring distances by means of a measuring unit and a flexible line (usually steel wire). Length gauges are used in mine surveying work.

The main components of a length gauge are a measuring unit connected to a revolution counter, and pulleys that lead the wire into the measuring unit. Devices for tightening the wire and suspending it over the line being measured are also part of the gauge. Length gauges measure horizontal and sloping distances by the number of turns of the measuring unit as it moves along the wire, which is stretched between two points. A length gauge can measure distances up to 500 m with an average error not exceeding 1:10,000. Length gauges are made for measuring the depth of vertical mine shafts (up to 1,000 m). According to their principle of operation, length gauges are analogous to the mechanical depth gauges used in navigation.

References in periodicals archive ?
Tenders are invited for Length gauge go and nogo added with 5 more items
Using an overall length gauge, he measured the cartridge base to ogive for G&A's test RPR at 1.
Important specs of the ACANTO length gauge include:
You'll need an overall length gauge (mine is from Hornady), a dummy cartridge casing that screws on the front end of the gauge, comparator that attaches to one of the legs of your caliper, a caliber-specific insert for the comparator, quality calipers measuring to 0.
just like Frankford Arsenal's cartridge overall length gauge.
e] is fixed by using reference measure of length, for example, end length gauge (length standard).
The MT 2751 length gauge was interfaced to PIC18F452 microcontroller through the LS736, a 32-bit CMOS counter, with direct interface for quadrature clocks from incremental encoders.
The last tool, relating specifically to loading for accuracy, would be an overall length gauge to determine bullet seating depth as it relates to the rifling lands.
If such a gauge is not available to you, there is an inexpensive and very effective overall length gauge available, called the Chamber-All.
Unless there is some reason not to I just start by seating all bullets to just barely touch the rifling using a Stoney Point overall length gauge.
You can purchase a special case length gauge that has various cartridge designations marked on it, or you may simply use a caliper and refer to recommended case length in a loading manual.