<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <body bgcolor="#FFFFFF"> Hi Dave.. I am not too awfully up on upright Geometry.. gotta correct that soon... grin.. BUT... I do know that the combination of rake angle, shank length, and bore length has to result in a hammer that strikes the string such that the shank is at less then parallel with the string or you run into blubbering. I am not really sure why this is so, but it came up at a Renner class I took a bit back. I am sure Newton could expound a bit on this (perhaps correct a misunderstanding on my part ?)     David Streit wrote: <blockquote TYPE=CITE><style></style> I'm kind of new at digging into the "Why's" of vertical hammer hanging.I noticed that an action I'm working on, the hammers have a rake of 88 degrees and a shank height between butt and underside of hammer moulding of 88mm. My question is, "Is there a relationship between rake and shank length, or are the 88s a coincidence?"I know the strike point is the important thing, but I wanted to make sure I wasn't missing a "Why". Thanks in advance, Dave StreitAssociate</blockquote> -- Richard Brekne RPT, N.P.T.F. Bergen, Norway   </body> </html>