Max tool weight?

[Tuba Dave]

I just managed to find a fly cutter to use on my my PM25MV. However it is a 10.5-pound steel disc. It did not look that heavy in the pictures. (I thought it was aluminum)
Is this too heavy for my mill? If so, by how much? Can I lighten it by drilling some holes through it? .

 

[RJSakowski]

As long as it is well balanced, I wouldn't think it a problem. It will have more inertia and take longer to spin up to speed and back down but the real issues are the cutting forces as they will be unbalanced and place a load on the bearings. If you are cutting a large diameter, you will be running at a fairly slow speed anyway.

How does it mount? Does it have an integral R8 mounting? What is the largest diameter you are anticipating?

 

[Tuba Dave]

It is mounted on an R8 adapter with 1/2 key ways. I got it to flatten the surface of a 10"x 12" plate that I want to turn into a fixture plate for my drill press. I assumed the reach of a larger fly cutter would compensate for the lack of y travel to do the whole thing in one set up.

 

[GeneT45]

That extra mass (inertia) will probably make it work better.
GsT