what is minimal impact of instrument that is good for sink handpan shell?

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what is minimal impact of instrument that is good for sink handpan shell?

 how many joules of impact should be?


let see example of instruments


hammer drill
bosh gbh 5-40 dce
http://www.bosch-professional.com/gb/en ... 878-ocs-p/
this thing weight is 6,8 kg and impact is 8,8 joules . it can be used to make
wide hole in concrete material.


electrick Demolition Hammer
Makita HM1304B 35-Pound Demolition Hammer
http://www.amazon.com/Makita-HM1304B-35-Pound-Demolition-Hammer/dp/B000140B4K/ref=sr_1_4?ie=UTF8&qid=1458717510&sr=8-4&keywords=Electric+Jack+Hammer+joules
15.8kg   27.5 joules


is impact from this things is enough for handpan sink?