Custom/Made to Order Acme Lead Screws
When either designing or manufacturing Power Transmission or Motion Screw using an Acme thread profile, PST follows the conventions outlined in ASME B1.5-1997. Although the standard goes back to 1952 the thread profile itself has been in use for over 100 years. This American Society of Mechanical Engineers document covers:
- General Purpose Acme Threads
- Centralizing Acme Threads
- Gaging for General Purpose Acme Threads
- Gaging for Centralizing Acme Threads
In the United States Acme threads are probably the most commonly used thread profile when designing a lead screw for power transmission or linear motion (the European equivalent is the Trapezoidal thread profile). The Acme thread makes a very robust actuation screw that packs a great deal of dynamic and static capacity into power transmission package. This exceptional capability does come at a price in its efficiency with Acme thread screws being approximately 30-40% efficient.
PST does offer Acme threaded lead screw and nut assemblies that are manufactured using proprietary process wherein the efficiencies are typically improved by 10-15 percentage point or more. Please contact PST with your specific requirements.
Stub Acme Lead ScrewsThe Stub Acme thread profile is variant of the Acme thread profile and is used in situations where a coarse pitch, shallow thread is needed for power transmission or linear motion but there are mechanical or metallurgical design limitations. The American Society of Mechanical Engineers standard which PST uses for design and manufacture of Stub Acme thread is ASME/ANSI B1.8-1988. The standard covers:
- Sub Acme Threads
- Modified Stub Acme Threads, Form 1
- Modified Stub Acme Threads, Form 2
- Gaging for Stub Acme Threads
Just like Acme threads Stub Acme threads make a very robust power transmission thread but can have the same efficiency issues. Likewise just like Standard Acme lead screws PST can supply an improved efficiency Stub Acme screw and nut assembly for power transmission and motion.
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Precision Screw Thread Corp.
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 ISO 9001: 2000 and AS9100 B CERTIFIED
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