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Chockstone Forum - Gear Lust / Lost & Found

Rave About Your Rack Please do not post retail SPAM.

Topic Date User
Retrieved pro from Dog Rock - LittleHammer début. 25-Sep-2015 At 6:23:24 PM TimP
Message
On 18/09/2015 rightarmbad wrote:
>I have a question for you Tim.
>How much energy can this thing impart?
>How does it compare to even a 3" backswing with a normal nut tool?
>
>What is it's total weight?
>If it is substantial, then it may simply be a lighter system to carry
>a very small hammer with you to hit a normal nut tool.
>
>I'm curious as to how good this thing can be.

I think it isn't the energy it's the peak of the impact force. A stab impact with the weight of the arm is softened by the palm of the hand as it backs up the tool. A swing of a nut tool (hammer-like) over 3" would give a reasonable peak force if you hit the target but the swinging end is only a few grams. There is a huge discussion of the physics of this over at Mountain Project:
http://www.mountainproject.com/v/spring-loaded-nut-tool-on-kickstarter/110979110

LittleHammer is 130g, the impact weight is over half of this and accelerates pretty fast when released. I had some engineer students offer to model the forces but haven heard back yet. It was trial and error for me, the second prototype weight didn't have enough grunt so I upped its mass.

One of our backers just pulled out of the limited "get LittleHammer rolling special" so there is one available: AU$70 with free postage world wide. Grab a good deal!
https://www.kickstarter.com/projec…/climbdesign/littlehammer

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