are 3/4 shafts good for axis ?

Hi all,

I am designing a wood router with a 18 inch wide X axis.
it looks like 3/4 inch shafts will fit the design really well, floating, connected to the ends, not fully supported along the length.

I plan on using a trim router and will do cutting in wood.

Anyone have experience with 3/4 inch shafting ? I am on the fence between 1 inch and 3/4 inch.

If I was planning on doing anything stronger, I would use linear shafting that would be fully supported along the length, but that would cost more than the rest of this machine !

Suggestions and feedback welcome.

Dave