Accurate Machine and Tool is a supplier to top OEM manufacturers and Tier 1 suppliers-producing stamped parts, injection molded parts, and assemblies.

Multi start threaddrawing

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Multi start threadPDF

Deciding whether to use multi-start threads or single for your application is sometimes tricky, simply because there are advantages and disadvantages to both. For example, a single start trapezoidal thread will self-lock, whereas a multi-start thread will not. On the other hand, you can travel much faster with a multi-start thread.

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If you need further information on an of our leadscrews, please visit the website https://www.igus.co.uk/info/lead-screw-units-lead-screw-units or speak to one of our experts on 01604 677240.

Multi start threadprogramming

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Lead screws are machine elements that convert a rotary movement into linear travel. Lead screws consist of a cylindrical round thread on which a single helix spirals the continuous length, transforming it into a screw. The threads can have, for example, the trapezoidal thread form, metric thread form or the dryspin® geometry designed by igus®. The dryspin® thread is similar in structure to a high helix thread.

Multi start threadformula

The conventional teaching method is the traditional approach that has developed over time through widespread usage and agreement in the field of education.

Multi-start thread or single? There are so many confusing terminologies surrounding lead screws, so let’s strip it down and get back to basics.

Multi start threadchart

Finally, the third lead screw in this example shows a four-start lead screw. This means we have 4 thread starts indicated by orange, green, purple and blue. For the linear travel the same calculation applies here as for the other examples.  The linear travel (lead) is therefore four times the distance between the flanks. The start of the thread is at a position of 90° to each other.

Our experts are on hand to offer application advice, to ensure that the best possible thread choice is used in your application.

The lead screw on the left (number 1) shows a single start lead screw. You can identify this by having one single thread. This is what is referred to as a single start. This means that the distance between the flanks, marked by pitch, is also the linear travel (lead) in millimetres per revolution of the lead screw.

Multi start threadexample

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For lead screw number 2, a further thread has been added, which is shown with the green illustration. This means that with one revolution of the lead screw the two-fold stroke is achieved (lead = 2 x pitch). The start of the thread is offset by 180°, i.e. opposite each other. This is classed as multi-start threads, or sometimes referred to as a two-start thread.

Multi start threadsizes

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