About Stands (Heavy Duty)
In the precision measurement business, it is crucial that metrology instrumentation remain absolutely stable during the measurement process. The last thing you want is to have unspecified data variations creep into the system due to movement during the data capture phase. This is true regardless of whether you are using a portable CMM arm, Laser Tracker, Laser Scanner, Theodolite, Total station, Optical Tooling instrument, or anything else.
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Some of our most popular stands are our heavy duty stands, which include our 230, 231, 232, and 233 series stands. They share the following characteristics:
The bases of these stands are cast iron for strength and stability. Three 2" casters with rubber tires are used for mobility, and may be retracted into the base by a foot pedal. (Due to its weight and size, the model 232 stand has larger casters, and raising or lowering them is accomplished by a hand wheel on the base.) In use, the stand rests on three adjusting screws called "trivets", with locking nuts. This permits leveling the stand on uneven surfaces.
Our main (or "outer") tubes are seamless steel tubing with a clamping collar on the upper end. Air trapped inside this tube by the air-check mechanism prevents rapid descent of the instrument if both the ratchet pawl and clamping lever are released at the same time. This feature helps to protect against accidental damage to expensive instrumentation.
Intermediate (or "inner") tubes are hard chrome-plated for wear and rust resistance. Interchangeable instrument mounts and various accessories may be fitted into the upper end of this tube via the 2.825"-20 NS-2 thread. A rack and pinion gearing system allows raising and lowering the instrument.
The pinion gear which raises and lowers the intermediate tube is controlled by four spoke-like handles which give you sufficient leverage to put your instrument in just the right position. A ratchet pawl on the gear rack helps to avoid inadvertent drops. A foot pedal engages and disengages the casters on the bottom of the stand. (As a matter of good practice we always recommend mounting the instrument on the stand after the stand is secured in place).
Just what does "Hollow" mean?
On a number of our stands and accessories, you will find the designation "hollow", often with an "H" included in the model number. This means that the stand or accessory has an open vertical centerline, with an unobstructed view straight down through the stand. In other words, if you look down on the center of the very top of the stand, you would see the floor underneath it. This allows for a "plummet shot", or shot straight down, which is important in some applications where our customers must center their instrument vertically over a floor target or other monument or reference.
For specific characteristics of each of our stands, please refer to their individual catalog pages.