Thread angle

Common bearing (singly). 96-98 Worm gear varies with thread angle... 

Sharp thread Thread angles are less than 60°. Sharper threads can be forced into ductile plastics more readily. 

Smne spedak have thread an es smaller than the 60 common on most standard screws. Included an es of 30 or 45° make sharper threads that can be fcwced into ductile plastics more readily, cxeating de mr mating threads and reducing stress. With smaller thread angles, boss ze can sometimes be reduced. 

Before moving on to the dynamic models of lead screw systems, the effect of thread geometry on the contact forces is considered here. The force interaction shown in Fig. 2.7 is essentially correct for the square threads where the normal force is parallel to the lead screw axis. For Acme or other types of threads, a slight modification is needed to take into account the thread angle. 

Fig. 2.8 Effect of lead angle on the measurement of thread angle...

I. The Hershberg stirrer, shown in part in Fig. 2, provides very efficient agitation of this or other pasty mixture. Two glass rings are sealed to the end of a stirrer shaft at right angles to one another, and each is threaded with B. and S. No. 18... 

Bent sub Sub used on top of a downhole motor to give a nonstraight bottom assembly. One of the connecting threads is machined at an angle to the axis of the body of the sub. 

The threads of a woven structure which run across the fabric from selvedge to selvedge at right angles to the warp threads. 

Attenuated total reflectance infrared (ATR-IR) is used to study films, coatings, threads, powders, interfaces, and solutions. (It also serves as the basis for much of the communication systems based on fiber optics.) ATR occurs when radiation enters from a more-dense material (i.e., a material with a higher refractive index) into a material that is less dense (i.e., with a lower refractive index). The fraction of the incident radiation reflected increases when the angle of incidence increases. The incident radiation is reflected at the interface when the angle of incidence is greater than the critical angle. The radiation penetrates a short depth into the interface before complete reflection occurs. This penetration is called the evanescent wave. Its intensity is reduced by the sample which absorbs. 

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