Pneumatic Hammer Flow Chart

[abknight@zzzzzz]

Simon,

Thanks for the cutaway hammer view, though I?m afraid I don?t know how
to read it! If you?ve any of you interest in such matters I am toying
with notions of chipping hammers and that?s why I asked in the first
place.

I wonder how do makers such as F&K dampen vibration. They claim to do it
on their 5.2 hammer with a "fiber plastic" connection between the
handgrip and the cylinder that "noticeably reduces" vibration. I think
they are known for vibration damping in their smaller hammers as well.

One thing F&K mentions is the heavier the hammer the less the vibration,
given a similar air consumption.

The F&K 5.2 has a 105mm piston travel making it by 15 mms the longest in
it?s class. That it is also vibration damped also militates toward
choosing it.

The BBG/Boehler is, as far as I know, a standard of heavy stone work in
Europe. This one is 9 kilos, a piston travel of 95 millimeters and at 1
cubic meter per minute, twice the air consumption of the F&K 5.2 and at
least 2 kilos heavier.

I wish hammers were measured by violence of impact, whatever measurement
standard that would be. Certainly the BBG must hit harder running wide
open, but perhaps turned down to a similar vibration level as the F&K it
would hit no harder than the F&K.

Piston width and piston travel are specified in charts, but what is the
piston mass?

Who knows! It?s been interesting trying to communicate with sales people
in Germany and Austria, but they are really at a loss to talk about
these matters.

http://www.bbg-gmbh.at/catalog/product_info.do?cPath=22_27_44&products_id=5681
Known as plug hammer:
http://www.bbg-gmbh.at/catalog/article.do?aPath=6_9_28

F&K 5.2
http://www.gemba.at/katalog/GEMBA_Druckluftwerkzeug.pdf
Password: Stein2005
http://www.f-u-k.de/index-eng.htm
http://www.f-u-k.de/index-eng.htm