worktop radius

[jonny round boy]

For an inside radius, I'd use the same jig to make a template in 9 or 12mm MDF, then clamp that to the worktop & cut with router & 30mm collar.

My radius is at the corner of a 600mm long surface and 900mm bar at right angles. So do I biscuit join a piece onto the side then cut?? Other problem is that a sink has to go in this corner too, a small 450 dia stainless. Not ideal for jointing but will well glued biscuit joints work??

I'm not quite sure what you mean - I was going to suggest you post a picture, but since you're a guest I don't think you can.

Could you explain it a bit more?