Over time and with the need for different options in thread forms to address increasingly more complicated and extreme load types of working conditions, various thread forms came into use. Many of these thread forms, including the trapezoidal thread form, have been in use for hundreds of years. In fact, the most popular, the Acme thread form, was first used in 1894.
While a trapezoidal thread form is not a new concept, the ability to create precision lead screws is continually evolving. Using CNC machining technology, manufacturers of precision trapezoidal lead screws can minimize the force of friction down the length of the screw, increasing efficiency and effectiveness while also reducing wear and tear.
Understanding the Thread Form Strength
The name says it all in the trapezoidal lead screws. These screws have a thread form that shows a definite trapezoidal shape. The inside top of one thread to the inside top of the next thread is always 29degress.
Additionally, the pitch or the length between the inside of one thread at the halfway point up the thread, is twice the height of each individual thread. With the wider base of the screw and the square, flat top of the thread, this is an ideal thread for any type of power screw application.
Ease of Manufacturing
With the use of CNC technology, manufacturers of precision trapezoidal lead screws can work to the specifications of their customers. This includes offering right and left-handed threads, single or multiple lead threads as well as the option to use standard or metric sizing.
In most applications, these lead screws will be made from alloy steel or stainless steel. This adds to the strength and durability of the power screw while also utilizing natural corrosion resistance and ability to withstand temperature extremes and changes.
