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Calvind Dude is specialize in R&D and manufacturing fully automated assembly line for electronic equipment and industry manufacturing automation equipment's.

In the West, screwing machines have been used for many years to produce screws from metal stock. The screw is made by cutting a helical groove in a metal disc. A steel rod is inserted into this groove and then rotated, as shown in Figure 1. This rotation cuts further into the helical groove and produces a helically threaded shaft which can be removed from the machine.

The quality of screw produced depends upon two major factors – the depth of helix cut and the pitch or lead of thread - measured as one-half of a revolution per unit distance.

1. The pitch is the lead of thread, measured as one-half of a revolution per unit distance.

2. The depth of thread is the distance between threads and it is measured as the distance from the leading thread to the trailing thread.

Pitch and Depth of Thread

The pitch and depth of thread are important because we need to produce screws with as few as possible revolutions (nominal pitch) per inch (or mm), and as little as possible variation in pitch (lead) per inch or mm. We also need to control the depth of thread so that the screw is not too deep in the hole when it is installed.

The pitch is 4 times the distance between threads. Therefore, if you double the pitch you will have eight times as many revolutions of thread and if you quadruple (four times) the pitch, you will get sixteen times as many revolutions. A high-quality screw of both proper pitch and proper depth of thread can be produced by a machine with a single revolution per inch or mm.

When we make screws we cut one helix for each pair of threads. The depth of this helix is called thread depth. By making the thread depth uniform, we are able to produce screws having screw-threads that are uniform in depth.

This property is very important for observing accurate spacing of holes in the workpiece.

The thread depth of a screw must fall between 0.5 and 0.7 times the width of a single thread i.e if the single thread width without projection is "A", then the permissible range for permissible range for permissible range for permissible range for permissible range for permissible range for tolerance on assembly is 2A ± 0.2 or 1A ± 0.3 mm, depending on whether tolerance on assembly is 2A ± 0.2 or 1A ± 0.

Our products including automatic screw locking machine, robotic screw fastening system, automatic screw tightening machine, automatic screw feeder machine, Automatic soldering machine, Led production automation line and Electronic automation assembly. As a automated assembly line manufacturer we operate with our products with our own brand Calvind Dude for our global customers and we also doing many OEM & ODM production for custom automation companies.

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