Gallery, Projects and General > The Design Shop
Two bolt versus single bolt clamps.
Anzaniste:
I recall reading or hearing that a single bolt clamp on a shaft was better (more efficient ) than a two bolt clamp for transmitting torque. By this I mean that the clamp ring has one split in its circumference or two splits.
Is this true? and if so why?
For the purpose of this discussion I am assuming the clamps in both cases to be similar widths and thickness's.
Lew_Merrick_PE:
Anzaniste,
If I am reading your question properly, you are referring to circumferential split collar clamps. Correct?
If so, then the advantage usually lies with the dual-split, 2-screw version. The reason is that you can more accurately match the true round shape of the shaft and still make longitudinal adjustments. With a single-split, 1-screw version the form taken defaults to a slight clearance between the collar and the shaft to allow longitudinal adjustment. When clamped, you only (usually) get three points of contact between the collar and the shaft which reduces the overall area of contact over which friction works.
Hopefully I have answered the correct question.
Anzaniste:
Lew, thanks for your comments.
Yes, you are answering the right question.
The clamp in question would be bored to be a transitional fit on the shaft and in the one bolt case the gap would be temporally opened up with a wedge to position the collar along the shaft.
In case you are wondering about such a bonkers arrangement it is the fixing method for the sprockets on the back axle of a pre war chain driven Frazer Nash.
Arbalist:
Have you got any pictures/links for the two types?
Lew_Merrick_PE:
Arbalist -- If you go to the Ruland website (http://www.ruland.com/) you will see lots of examples.
Anzaniste -- The problem with wedging it open is that can (and often will) deform the collar leaving you with the 3-point contact I cited previously.
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