traveling steady, turning 1/2 bar down over 10".

[graffian]

Spindles are for girder forks, 3/8 seems to skinny!
I was hoping for 1/2 thou over and I would set about them with an external hone then polish them, I did wonder about hard chrome or some sort of coating? They are running in PB102 bushes, two bushes 1.5 long 6 inches apart, the previous ones were extremly worn[.01 lips] and the holes they run in were .05 oval, so a few thou clearance is probably fine, finish wants to be good.
I am using a triangular insert, it's about as much as I can remember about the insert. Not quite. It's probably .4mm nose and they are probably 7º sides. They are from a box of gold mitsubishi inserts from drill services £1 for the hospice box;-). They leave a lovely surface on EN24.
I was cutting to depth, so either .0625 or .125[3/8 or 7/16 spindles], feeding between 2 -3.5 thou. Keeping the speed right down to 3xxrpm, I am running to slow because of the steady.
I have just carefully set the centres and steady each time I moved the bar, or tailstock.
I was setting everything and then had multiple goes on the same setting.

Each part has been usable, .4367-.4385 across 10" and the middle 6 inches, which is the bearing, is less than a thou of variation.
After getting enough usable stock for the 7/16" spindles, I upped the speed to a thousand rpm and feed to 7.5 thou, finish is better and I have the 3/8" diameter spindles with 1/2 thou variation across 8.75" inches.
I have the ends the same size with a huge great 1/2 thou bulge in the centre;-)
I think an old carbide insert brazed to the stud in my steady wouldn't be a bad idea, I had to move the bronze stud several times as it was wearing. I also changed the oil for the steady from a way oil to a motor oil, the surface of the bat where the steady was rubbing wasn't damaged.
But I wouldn't want to have to make some of these for someone. I clearly need more practice with a steady.