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SLIDE SCREW

SLIDE SCREW
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SLIDE SCREW SLIDE SCREW I-1

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 The NB slide screw consists of two aluminum blocks, each with three radial bearings with a fixed angle between them. A round shaft is inserted between the two blocks, and its rotation produces linear motion determined by the contact angle between the shaft...

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Allowable Rotational Speed When the rotational speed is increased and 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. Figure 1-3 Mounting of Slide Screw E: modulus of direct elasticity (N/mm2) A: installation coefficient (refer to Figure I-3) I: geometrical moment of inertia (mm4) A: cross-sectional area of the shaft (mm2) If modulus of direct...

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Clean dust from drive shaft. Place shaft between upper and lower blocks. Lightly tighten thrust adjustment bolts until the clearance between the shaft and the bearings Temporarily attach the slide screw to the table. 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. Tighten the thrust adjustment bolts evenly while appling a thrust force to the table untill slippage disappears. Care should be required to avoid excessive tightening which results in...

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