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Forums
Engineering
Mechanical Engineering
Calculations for a lifting tool for a bar
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[QUOTE="Baluncore, post: 6850716, member: 447632"] Lifting by compression against the underside of the head becomes tension in the bar. The tension will be focussed on the fillet below the head. The failure mode would probably be by shearing along a conical surface that intersects the fillet. Once the stress reaches the bar shank, it will be F/A. The advantage of a collet is that it clamps onto the shank of the bar, using the head as a position reference. The head only needs to carry the forces that activate the collet during the attachment. The head does not then need a step with a fillet, it only requires a conical taper that is steeper than the collet taper. It is easier to upset and spread the end of the bar than it is to form a flat head step. The length of the collet can be made sufficient, such that the tension in the rod rises gradually to F/A. The critical included angle of the collet taper is the arc tangent of the friction coefficient between the bar and collet. A steeper collet taper will release easily, while a more gentle taper will lock, requiring a reverse impact to break the grip, that may have safety implications. [/QUOTE]
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Calculations for a lifting tool for a bar
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