Spring Cut Off Evolution! An Easy to make design + the PLANS

[winkys workshop]

I wouldn't dismiss spring cut off holders; both history and video proves they work. I use wedge QCTP, and use one every time going in on cast silicon bronze.

Personally, I'd believe the spring works primarily not because it accepts vibration/ chatter of inadequate rigidity, instead gives an extra kick to an overbearing chip load it ejects, that a conventional holder cannot.

The top of this blade is shaped to make the chips more narrow than the cut (HHIP 2000-7030 3/32 x 11/16 x 5 Inch 5% Cobalt P3N Style Parallel Type Cut-Off Blade) so the chips never get stuck. I love this blade. I think the spring action compensates for the inward tilt of the tool post flex. With a normal blade holder the point of flex is below the tool and when the tool grabs it is also pulled into the work. When the point of flex is on top the blade pulls back. I don't think it actually pulls back but it lets the tool post flex without puching the blade into the cut.