Client
Self
Industry
Ice climbing
Description
Add hammers to Petzl Nomic ice tools by machining both the
Nomic Astro picks and Quark Hammers for a 1/2-lap fit fastened
by the rear bolt. The 4mm blade of the Hammer extends a small
distance within the Nomic Head for support, and the Hammer
seat is moderately contoured to fit the rear profile of the
Nomic Head. Petzl has adopted this approach for their
fall 2010 products.
The modified Hammer adds 40g, albeit in a destabilizing position
furthest from the pick point. Removing the Nomic pick weights
eliminates 60g mass to compensate. The addition makes
no discernable change in swing action.
Both ABAQUS Standard and Explicit FEA were employed to calculate
the acceptable lie-back torque a climber may safely apply
to this adapted hammer. Analysis validation was performed
using strain-gage instrumentation, and the steel qualities
were established via Instron tensile testing.
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