Biax not cutting smooth

Half inch stroke on the bottom. 3/4 on top. Honestly at 3/4" stroke it feels super unwieldy. Like a jackhammer pushing the tip all over the place. I mostly do smaller work, and it seems hard to imagine that would be useful for precise work. But I'm new to this so I dunno.

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Its the machine, or the blade holder cause I can take the carbide blade out and put it in my hand scraper and do this. Do I need to thin the blade holder? This blade holder is 3/16 mild steel 3/4" wide and a little under 6" long. Are dapra blades spring steel or mild steel?

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it’s called chatter. First thing, sharpen your tool.
 
And 2nd thing, sometimes your tool gets magnetized and attracts little pieces of cast iron that cause marks like that. So, de-magnetize your tool from time to time.

Sharpen, demagnetize, that's all I got.
 
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