Dear Jason
A common enough machine with the right blade support is a sheet metal treadle operate notcher. This machine is normally manually operated even in large workshops. Here is one >From http://www.bing.com/images/search?q=treadle+notcher+sheet+metal <http://www.bing.com/images/search?q=treadle+notcher+sheet+metal&qpvt=treadl e+notcher+sheet+metal&FORM=IGRE#a> &qpvt=treadle+notcher+sheet+metal&FORM=IGRE#a Doug: I am really interested to know if the angle at which you hold the wood makes much of a difference to the required shearing force. I understand from the photos you sent that holding the wood to the side is 'on an angle' but I was thinking of it being held up so the blade cut into the fibres more like someone whittling wood with a penknife slanted downwards. Assuming the feed-in side is well supported (not sure about the offcut side) is there a reduction in force needed when the blade is diagonally as see from the side? At some angle the wood would tend to split into 2 or more pieces as the cut continued. That might be helpful to some. Thanks Crispin Doug, would your design objective make it feasible to make that cutter foot operated with a return spring? Closest thing I can find with a short search is a foot operated grommet press. http://navyaviation.tpub.com/14218/css/14218_230.htm Jason
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