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Re: [bigjonnyc] Ascender cam design:
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atlnq9
Apr 3, 2009, 5:11 AM
Views: 5616
Registered: Sep 10, 2007
Posts: 111
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bigjonnyc wrote: It'd actually be pretty easy to create a design that incorporates a mechanical stop that keeps the cam from compressing past a certain point.
My personal thought then would be that the teeth would be more prone to ripping the rope sheath since compressive force would no longer be applied as more downward force was applied.
philbox wrote: I would think that if a logarithmic spiral was designed into a cam on an ascender such that a greater and greater compressive force was to be applied to the rope then under certain extrem e circumstances the rope would be chopped. Just my conjecture is all.
Maybe I am misunderstanding what you are saying but that is exactly how the cam on an ascender works. The harder you pull on it the more force it exerts on the rope to create a greater frictional force counteracting the downward force. I would be very hard pressed to ever say that an ascender can be deigned which cannot cut a rope, especially toothed one which cannot slip.
misanthropic_nihilist wrote: Here's an easy way to figure out if the cam is logarithmic.
patto wrote: For starters the cam should not touch the metal wall when there is no rope in the device. If the cam does touch the wall you have designed a device that will chop.
But in theory it seems similar: you are designing something to fit a certain size range to accommodate different sized ropes and rope compression which provides more force against it as more downward force is applied.
Edit: Edited for grammer
(This post was edited by atlnq9 on Apr 3, 2009, 5:15 AM)
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Edit Log:
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Post edited by atlnq9
() on Apr 3, 2009, 5:15 AM
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