Newbie help hole boring

[mekanik]

Try 250 see how it goes, it's a bit of trial and error depending on material/machine stiffness ect. just have a play

[m_c]

By the sounds of it, you want a less springy boring bar.
Use as large a boring bar as possible, and if you really do have to use a relatively long overhang from the tool post, a carbide bar will help as it's not as springy.

As mekanik says, HSS should help, as it's a sharper edge, and not relying on a blunt edge with brute force to cut the metal. Although one thing you could try if you have an insert bar, is use an aluminium insert, as they typically have sharper edges than inserts for steel. You won't be able to take as big a cut, and the insert won't be as durable, but should produce a smoother finish.
And a key thing with inserts, is keep them cutting. Don't let them rub.

[dfox1787]

thank you for responding.

Still struggling with it not sure if i reach the limitation of my lathe if its my tools. Ill see if i can find some more time to have another go.

[cropwell]

Have you got a fixed steady to support the end of the tube ?

[dfox1787]

Have you got a fixed steady to support the end of the tube ?

i havent no. i could look at making one if that is what i need

[m_c]

You've got a major chatter problem.

I would invest in a bigger boring bar, and cropwell's suggestion of a fixed steady would also help.

[dfox1787]

You've got a major chatter problem.

I would invest in a bigger boring bar, and cropwell's suggestion of a fixed steady would also help.

any suggestions for a boring bar. Not sure where i would get a fixed steady for my lathe.