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Quick question on fly cutter build

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umahunter

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#1
When cutting the tool slot it needs to be offset so the tool tip lines up with the centerline is that correct
 

T Bredehoft

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#2
You got it.
 
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umahunter

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#3
Thanks just wanted to be sure
 

T Bredehoft

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#6
Just like a lathe, the tool has to be on center. If its below or above, it won't cut right.
 

P. Waller

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#7
You have had this experience?

A tool held in a lathe is cutting on a radiused surface a fly cutter is cutting a radius on a flat surface, think of a flycutter/face mill as a rotary shaper tool which has no center of motion. It is indeed good practice to keep the cutting edge on the center line of a mill spindle however it will still work fine if it is not.
 
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