holding an odd piece in a chop saw

[BrokenBiker]

i need to hold a length of stianless tube in my abrasive shop saw, but the snag is, it needs to have 15mm cut off through the length, so leaves me with a 60mm and 75mm tall C profile and i need the open/cut face to be vertical to allow me to set the vice at 18 degrees and get the segments i need.

my first thought was to mark it out for the cuts, then tack a bit of steel barto the cut face to give me a flat surface for the vice, putting the tacks in the 'scrap' areas so as not to dilute the stainless i actually need, but im wondering if anyone has any other/easier ideas. it needs to be flipped in the vice between each cut, i need 10 segments so 20 cuts total.

i did think of cutting the segments first then trimming the 15mm off but then i wont get the right shape as i need the segments to come to a point.

extra points for anyone that can guess what im making.

 

[Agroshield]

What diameter is the tube?

What percentage of that diameter is 15mm?

If the 15mm is less than half the tube and it is not too fat, a square block of wood with a hole down its centre could work to hold it.

An engineer's vee-block could hold it, with a packer going to the inside of the pipe so the vice jaw does not spread it.

 

[BrokenBiker]

its 75mm tube...im removing 20%

a V block is going to raise the tube up off the deck and likely make it too high for the vice on a chop saw...

im also hesitant to put wood anywhere near the cut on an abrasive chop saw and having to slacken off and move the tube every time then throws the issue of indexing accurately for each cut...id like something i can just flip over and be confident the cut face of the tube is going to be vertical, hence my initail idea of welding some flat bar across the cut

 

[Agroshield]

a V block is going to raise the tube up off the deck...

Vee block goes horizontally, so all it needs is enough opening on the vice.

The vice jaw touching the cut edge will keep it vertical. If the standard ones are not tall enough, extend them. The extensions do not need to be opposite each other.

This is what I was trying to describe. The brown bit could be something non-flammable. The purple bit does the clamping. The purple bit could be made the full ID of the pipe if there is chatter or distortion from the cutting force. The verticality is preserved by having the cut edge touching either the fixed or moving jaw depending on which way it is flipped.