Deep drill on lathe

[TechNova]

I have drill bits I really like, multiple sets from Winter's Drill Bit City.
I have noticed that the chips don't like to come out of the flutes when deep drilling.
I was using 5/16" bit going 2" deep thru hole on MS. I ended up doing alot of pecking.
Is there a bit or flute design or coating that will improve this?

 

[Aukai]

Are you at about 1200 RPM?

 

[Eddyde]

Are you at about 1200 RPM?

That would be the about fastest I'd go, 800-1200 should work fine.

 

[projectnut]

You might want to try using a parabolic drill for deep holes. The flute configuration increases the amount of chips that can be ejected. I would only use them in a rigid machine as opposed to a hand drill. They have a tendency to pull themselves into the material if not held in a rigid fixed position.

Here's a picture of one. Notice the open flutes as compared to a standard jobber drill.

 

[TechNova]

You might want to try using a parabolic drill for deep holes. The flute configuration increases the amount of chips that can be ejected. I would only use them in a rigid machine as opposed to a hand drill. They have a tendency to pull themselves into the material if not held in a rigid fixed position.

Here's a picture of one. Notice the open flutes as compared to a standard jobber drill.

I can try one of those, I had seen that style before but didn't know what they were for or what they were called.

I will have to check on RPM, I know it was slow, maybe too slow.

 

[machPete99]

You can manually pull the whole tailstock back to eject the chips, saves on wheel turning.

 

[SLK001]

I ended up doing alot of pecking.

Probably the best way, without great expenditure on specialty bits. Don't try to rush things. Drilling a deep hole on a lathe takes time. Peck about 0.15-0.20", pull out to clear, put back in and peck again. Repeat as needed.

 

[ChazzC]

You can manually pull the whole tailstock back to eject the chips, saves on wheel turning.

Joe Pie has a Shop Gem video on Straight Deep Holes on the lathe and shows how to use the carriage as a stop for moving the tailstock in & out.

 

[Firstram]

I bought a MT3 BXA tool holder, I love it! Most of the holes I drill don't need to be that accurate so I can get away with eyeballing the cross slide alignment. It makes pecking so much faster!

 

[TechNova]

You can manually pull the whole tailstock back to eject the chips, saves on wheel turning.

Tried that too. I need to get a box wrench to fit instead of the open end, it is tedious to keep picking it up to loosen. A box wrench could be left on the nut.