How do I cut a 16mm 45 degree slope on the sides of a 48mm high square block?

Draw it up in profile:

To do that w/ a single pass you will need over 1.5" of diameter — which Amana does not have available in a 1/4" shank tool:

you’ll either need to use multiple tool passes, cut more shallowly, or source a different tool.

Elaire has an 8mm (5/16") collet which may make a larger tool available — if you go that route, I’d still suggest multiple passes w/ the smaller tool — just leave a roughing clearance and take the finishing pass w/ the larger tool.

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