Machine Acme Screw Jack Technical Information

Nook Machine Screw Jacks are fitted with Nook's own PowerAc™ Acme Lead Screws and Nuts. Nook Industries manufactures PowerAc™ precision acme screws by thread rolling for ActionJac™ Worm Gear Machine Screw Jacks, a process that produces high-precision screws. Nook Acme Screw products feature centralizing thread forms for smooth, no-wedging performance.

Straightness

PowerAc™ Acme Lead Screws are straight within .010 inch/foot when shipped from the factory, and do not exceed .030 inch in any 6 foot section.

Material Surface Lead Accuracy Screw Dia. Screw Lengths
Alloy black ± .0003"/" up to 112" dia. 14" to 112" Limited only by material availability
Stainless steel ± .0003"/" up to 112" dia. 14" to 112" Limited only by material availability

Backlash

Backlash (lash) is the relative axial movement between a screw and nut without rotation of the screw or nut. The axial movement between a new PowerAc™ acme nut and screw will range from .003" to .015" depending on size. Lash in ball screws will remain constant during normal use.

Nook machine screw jacks are used in large material transfer applications as seen in the image below.

Figure 1