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| Motion/Positioning // Lead Screw // |
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PIC Design has significantly increased its range of lead screws and nuts to provide users with the most complete line in the industry. Designers are no longer confined to the original Acme lead screws ... the new and innovative PS Series employs a new Kerk style thread form that is designed for maximum life and quiet operation when used in conjunction with the patented anti-backlash nuts. |
PIC Design has significantly increased its range of lead screws and nuts to provide users with the most complete line in the industry. Designers are no longer confined to the original Acme lead screws ... the new and innovative PS Series employs a new Kerk style thread form that is designed for maximum life and quiet operation when used in conjunction with the patented anti-backlash nuts.
PIC Design Lead Screws
Lead screws provide an economical solution for the transfer of rotary motion to linear motion. All PIC Design lead screws are precision rolled from 303 stainless steel with a lead accuracy of .0006 in/in (mm/mm). They are stocked in both inch and metric sizes with diameters that range from 3/16" to 3/4". Lengths are available up to six feet.
The now familiar precision rolled Acme lead screws are available with the above noted accuracy when used with Turcite X (Acetal-Teflon and Silicone filled) nuts. The new PS style lead screws have accuracies similar to that of the Acme line, but feature a positional repeatability to within 50 micro-inches. These lead screws feature a burnished finish of 16 micro-inches, and a straightness of .003 in/ft. PS style lead screws are available uncoated or coated with a custom composition of baked-on Teflon. This coating greatly improves lubricity and extends the normal life of the assembly by as much as 300%.
PS Style threads
Anti-Backlash Nuts
The standard method for taking up backlash is to bias two nut halves axially using a type of compliant spring. Using this method, the spring force must be at least as great as the load to be moved. The new PS style lead screws use a patented axial take-up mechanism, which effectively puts a stiff spacer between the nut halves. By using this design, the nut functions independently of the load, resulting in a low drag torque. Nuts are a self-lubricating polyacetal material.
PZ Series anti-backlash nuts are ideal for vertical applications requiring noise and vibration control. This series accommodates lead screws with moderate loads, and diameters from 1/4" to 1/2".
PK Series anti-backlash nuts are very low in frictional drag and are specifically designed for 3/8" diameter lead screws.
PV Series anti-backlash nuts provide the maximum load carrying capability and the lightest axial and radial stiffness. This results in smooth, quiet operation, and long life. The PV series is best suited for higher loads, and is thus used on PIC's largest lead screws with 1/2" and 3/4" diameters.
ACME Style threads - Power And Anti-Backlash Nuts
PIC Design offers three Turcite X nuts that are compatible with Acme style lead screws. Each nut offers distinct advantages.
ANR1 Series power nuts are used where a range of .003" to .007" axial backlash can satisfy user requirements. The ANR1 is the most economical.
ANR2 Series anti-backlash nuts are designed for applications requiring positional accuracy and repeatability. The ANR2 anti-backlash nut assembly consists of two halves with an axially compliant spring that provides some ability to fine tune preload. The spring preload on the nut must be approximately 5% greater than the axial load on the system.
ANR3 Series anti-backlash nuts are designed to be adjusted. An “O” ring spacer is placed between the two halves of the nut. The back half of the nut is adjusted by simply turning the outside body until desired preload is obtained. The “O” ring provides for minor screw thread deviations. ANR3 series nuts can be used for higher loads than the ANR2 series. |
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Motion/Positioning
