Large spade bits or what?

[wm460]

I want to make some concave recess in a large piece of wood.
First thought was to do some offset turning but it is too big to put on a lathe also my injured digit will get in the way.
I though of grinding a spade bit to the required shape but the largest I can find is 40 mm I need 55 mm.

Any ideas?

 

[Penpal]

Irwin Aust adjustable bits .You have not given size or depth.

Peter

 

[wm460]

55 mm wide , 15-20 mm deep.

I have an adjustable bits like in your link Peter but it gives me a flat bottom hole with a large pilot hole as well.

I need it to look like the diagram in the right.

https://www.google.com.au/imgres?im...d=0ahUKEwjmiMqD1IXLAhULE5QKHW53AA8QMwgzKAIwAg

 

[bassethound]

How big is the workpiece? It' possible to do it on the table saw with care!

 

[bassethound]

https://uk.pinterest.com/pin/385620786820166842

Or have I got you wrong?

 

[Doug]

Router, particularly if the bottom of the hole needs to be flat, guide bush & circle jig if it needs to be perfectly round.

 

[flexi]

Yup have to agree with Doug....i would be reaching for my palm router and a core bit

 

[Dalboy]

Carving chisels, or an excuse to buy a bigger lathe

 

[wm460]

Carving chisels, or an excuse to buy a bigger lathe

I am waiting for the Vicmarc VL 600