Fly cutter

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Hukshawn

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I’m making a bigger mill appropriately sized fly cutter, my other one was sized for my mini mill.

You take the time and effort to tram your mill well, and make sure everything is square and true... but how would you know if you’ve made your fly cutter true? How do you know your fly cutter doesn’t have a slight wobble to it?
 
I am pressing the cutter onto an r8 collet I made. If it gets pressed on crooked...so one side of the cutter spins higher than the other.
Maybe I’m asking a dumb question.
 
The body may not be perfect, or as good as the spindle bearings allow, but the cutting edge will sweep a uniform circle, as good as the bearings. If the body does "wobble", set up a lathe turning tool in your vice and remachine it. You can turn the OD as well as face with the cutter body in the mill spindle.
 
Not a dumb question.
The tool is rigidly held by the spindle so the tool point will always describe a circle relative to the spindle rotation in 2 axes. You can not make a fixed tool do anything else even if you tried.
 
If the tool head got pressed onto the arbor crooked, wouldn’t it spin not true? Similar if my head was tilted?
 
It’s okay... I screwed the cutter head up anyways... cutting a slot to size, for some reason only added half the diameter of the end mill instead of the whole diameter. How my slot is over sized... I was hoping to have a good sliding fit to not completely rely on set screws. Efffffffffff....
 
Hukshawn said:
If the tool head got pressed onto the arbor crooked, wouldn’t it spin not true? Similar if my head was tilted?
Click to expand...
The tool being out of square will have no effect, only the orientation of the spindle to the work will cause the tool point to rotate at an angle in whatever plane it is tilted in, you can not force a fixed tool out of plane as hard as you may try.
 
Hukshawn said:
It’s okay... I screwed the cutter head up anyways... cutting a slot to size, for some reason only added half the diameter of the end mill instead of the whole diameter. How my slot is over sized... I was hoping to have a good sliding fit to not completely rely on set screws. Efffffffffff....
Click to expand...
Sounds like a few custom toolholders to fit the slot are in order.
 
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