Tapping End Bolts in Axle Shaft

[swifturtle]

I have designed the axle shaft in the attched file. I could not figure out how to get the threaded holes in the ends of the shaft to start at the base of the 0.5" radius relief which is cut into each end instead of at the center of the 0.5" radius relief.

This is important as I am loosing 0.5" of threaded hole to this and I can' afford to loose the added strength and bolt penetration. I think I am getting hung up on the maximum depth setting for a standard tap.

Any thoughts?

[Tech2]

You would use Comments To Machinist to clarify the area you want threaded.