draw tube

draw tube

A simple tube of 31.75, 25.4, or 50 mm bore into which fits the telescopic eyepiece in use. It is equipped with a mechanism, such as a rack and pinion, allowing fine adjustment of the eyepiece position in order to obtain a sharp focus.
References in periodicals archive ?
Limited tenders are invited for Draw tube for cnc m/c drg.
Ideally, when the focuser is assembled, the shaft is nice and snug against the draw tube, but not so tight that it bends.
UPR's come with a built-in air cylinder, so there is no need for a separate actuator and draw tube.
The seals protect the spindle, collet body, and draw tube from chips and coolant.
In late 2011, a new blood draw tube was rolled out for the collection of MaterniT21 samples, allowing for blood to be drawn directly at a doctor's office and shipped at ambient temperature, the company said.
It displays the position of the focuser's draw tube to an accuracy of 0.
Eliminating the conventional draw tube and external actuator, air is used only to open the chuck.
The estimate for a 13-mm x 75-mm, 4-mL draw tube is ~3 psi.
The length of the focuser's draw tube and the dimensions of the secondary cage ensure that stray light can't reach the focal plane and flood the view with a contrast-killing glow.
We get an extremely high pull back with these fingers on the draw tube, and the draw tube is threaded onto the collet and pulls the collet back into the spindle taper," Froehlich says.
The refractor's original sliding draw tube, which worked well for visual observing, was replaced with a fixed aluminum tube to eliminate any movement that would spell disaster for a long-exposure photograph.