What type of drill bits for lathe?

[James04]

I just purchased this set of drillshttp://www.mscdirect.com/IWCatProduc...3010&Keyword=Y for my lathe. They are 118 degree jober lenth HSS. Only when I attempt to use them as soon as I make contact with the work piece it wonders of center and then it chatters the whole time Im cutting with it. I was drilling a piece of 1/2 dia. aluminum that was being spun in my lathe chuck and the drill was in the tailstock. I was using a very slow feed (by hand) and I had made a centering hole before I attempted to drill. Are these the wrong type of drill bits? Is it the low quality of the bits. Or am I doing something wrong?

James

[CNCadmin]

You have to use a center 1st, to locate the center of the work piece and than you can drill it out. Run the piece at a high speed when using the center bit.

[James04]

Read my post again. This was done. I also faced it before centering operation.

[CNCadmin]

What type of "centering hole" if their was a counter bore, the drill bit should not have walked.

[Klox]

James,
I have info to answer your question.
I'll try to attach a zipfile of 9 pages.

Klox

[Klox]

James,
It seems the zipfile is to BIG.
I'll e-mail you the info.

Klox:

[James04]

Klox,

I had Email option turned off. I have now emabled it. Please send the Zip file. I can use all the help I can get at this point.

James

[Klox]

James,
I havent forgot you. I'm struggling to get the files down to a manageble size. I'm working on it, Cadcam offered me help.
We'll find a way to get it to you....

Sorry for the inconvenience.

Klox

[cadcam]

klox if you get me a file today I can at least make a link from my server to get at least a view or a direct download.

[cadcam]

James are you using a drill chuck in the center to hold the drill ? if so are you sure this chuck is straght are you cneter drilling first. 118 drill are a normal but there can be few reasions I have found for it to wonder.

[James04]

Cadcam,

I don't know what you mean when you say "in the center". I am using a chuck in the tailstock. It is a taper mount jt33 (enco precision 13mm cap.). I just got it. Could be defective! I'll have to check it for runout. Yes I am center drilling first. I found that my tailstock setscrew (on the underside of the ram) was loose. This did improve things a bit and I also made an adjustment to get the ram Parallel with the ways. It was off by .0005. This Lathe isnt all that precise and you can move the ram when fully extended by .001 or more depending on how hard you push. However when staring to drill the ram is fully retracted and it relativly sturdy in that position. Im looking into truing the Lathe chuck jaws but I need to wiat till I get some drill rod to do some checking.

Thanks,
James

[cadcam]

James I am putting links togeather that contains the info From Klox. most likly bu Wed being tommorow.

Time for some sleep sorry all.