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DIY For Audio
DIY motorised PC Monitor
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<blockquote data-quote="Timber_MG" data-source="post: 36222" data-attributes="member: 18"><p>The advantage of a metric screw in this application is that it is low cost and that it will hardly back-drive (meaning that the weight of the shelf wouldn't cause the screw to rotate due to the friction between the nut and the thread) Also a simple bearing block can be made to support the structure.</p><p></p><p>Choose the speed from the pitch and the rotational speed of the screw (perhaps M14/18 at 2/2.5MM pitch)</p><p></p><p>If you want greater pitches (and drive efficiency) you start looking at trapezoidal thread (ACME) and the cost is a fair bit higher (but not impossible).</p></blockquote><p></p>
[QUOTE="Timber_MG, post: 36222, member: 18"] The advantage of a metric screw in this application is that it is low cost and that it will hardly back-drive (meaning that the weight of the shelf wouldn't cause the screw to rotate due to the friction between the nut and the thread) Also a simple bearing block can be made to support the structure. Choose the speed from the pitch and the rotational speed of the screw (perhaps M14/18 at 2/2.5MM pitch) If you want greater pitches (and drive efficiency) you start looking at trapezoidal thread (ACME) and the cost is a fair bit higher (but not impossible). [/QUOTE]
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DIY & Tutorials
DIY For Audio
DIY motorised PC Monitor
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