SLIDE SCREW SLIDE SCREW

SLIDE SCREW SLIDE SCREW The NB slide screw converts rotational motion into linear motion by utilizing the friction between radial ball bearings and a shaft. This simple mechanism eases maintenance and installation work. The slide screw is most commonly used as transport devices in many types of machines, and is not intended for accurate positioning requirements. SELECTION METHOD Required Thrust Rated Life Tightening of the bolts creates a thrust force by pushing the bearings against the shaft. This results in a constant force being applied to the bearings regardless of the load. The thrust should...

SLIDE SCREW Allowable Rotational Speed Figure I-3 Mounting of Slide Screw W h e n th e rotatio n al s p e e d is in cre ase d a n d approaches the shaft resonant frequency, the shaft is disabled from further operation. This speed is called the critical speed and can be obtained by the following equation. In order to leave a sufficient safety margin, the maximum operating speed should be set at about 80% of the calculated value. 2 3 NC 60λ2 ・ EI×10 ……………… 7 γ A 2πL If modulus of direct elasticity is 2.06×10 5N/mm 2 and density is 7.8 5×10 −6 kg/mm 3 , the critical speed for a solid shaft is: 2...

SLIDE SCREW INSTALLATION 1. Clean dust from drive shaft. 2. Place shaft between upper and lower blocks. Lightly tighten thrust adjustment bolts until the clearance between the shaft and the bearings diminishes. 3. Temporarily attach the slide screw to the table. 4. Adjust the parallelism between the slide screw and the linear motion guides by manually moving the table back and forth. Fix the shaft accurately after the required parallelism is achieved. 5. Tighten the thrust adjustment bolts evenly while appling a thrust force to the table untill slippage disappears. Care should be required to...