Charles A. Sherwood writes:

I would like to make an accessory for my 3 ton arbor press for bending
thin stock. Basically I need a V block and a wedge attached to the
ram.

Don't need to use a vee block. My commercial Handy-Bend HPB 120 uses
angles arranged thus (in ASCII art) in cross-section, base of the jack
on the top of the upper part:

-++-
||
--+ +--
| |
| |

Then the work goes in like this:

\ -++- /
\ || /
--+\__/+--
| |
| |

With this you just press enough to overcome spring-back, and you can do
more than 90 deg if need be.