Round inserts are nice if you have the power and stiffness to use them. Only in desperation would I use a fly cutter simple because of the unbalanced load.
Because of their radius the round inserts will give a nice finish.
Have fun.

Dave

On 5/20/20 9:56 PM, John Dammeyer wrote:
I've been surfacing a casting that is larger than my machine envelope.   Not only 
that although pattern was 5/8" thick MDF the casting ended up with thicker and 
thinner parts.   With it shimmed and moving clamps around I managed to flatten the 
bottom and then clamp it down and surface the top.  But it took a long time.

I found LinuxCNC easy enough to use for this.  Just kept resetting x or y home 
and restarting the G_code.

Anyone used one of these?
https://www.aliexpress.com/item/4000890081459.html

Or with the round carbide inserts
https://www.aliexpress.com/item/32952847637.html

Alternatively since I use the Tormach Tooling at a much higher price there is 
this flycutter.
https://tormach.com/tts-superfly-cutter-kit-33031.html

John




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