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Discussion Starter · #1 ·
Am I correct to think Downcut spiral bits cannot be used for plunge mortising? Only for full length slots or dados...

Can I force plunge them like I do with straight bit by dragging them along as I plunge?

Price difference between them and compression "mortise style" bits is quite high and the compression bits are not good for shallow dados so that means buying both :(

Thoughts?
Mike
 

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David - Machinist in wood
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Are you wanting to know for handheld or CNC work, Mike? I use downcut spiral all the time on the CNC although I do my best to ramp rather than plunge (plunging is hard on the equipment). My ramps are steep, though, and typically 45° to 75°, so they're almost like a plunge but not quite as abrupt.

David
 
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