kb0thn
Stainless
- Joined
- May 15, 2008
- Location
- Winona, MN, USA
Hi guy,
This is probably a newbie question.
I am drilling a 0.116" hole into the end face of a 304 stainless part. The hole is usually centered on one axis and not on the other. So if I measure from the outer diameter of the drill hole to the turned out diameter of the part, I will measure something like:
Top:0.436
Bottom: 0.435
Left: 0.432
Right: 0.438
Hole diameter is on size and no observable difference in diameter in any orientation.
Machine is a Mazak QT15 lathe. Tool is a Ultratool solid carbide jobber drill. Held in a Maritool ER32 collet tool holder with cheap Chinese collet. Material is 304 stainless. Chucked using aluminum soft jaws on previously turned surface. Soft jaws were machined in the past and have been on and off the machine multiple times.
If I use a HSS drill bit, the hole location is substantially less concentric.
It has been a long time since I indicated in the x-axis on this tool pocket.
So basically my question boils down to what is causing the hole to be on center on one axis but not other?
Thanks,
-Jim
This is probably a newbie question.
I am drilling a 0.116" hole into the end face of a 304 stainless part. The hole is usually centered on one axis and not on the other. So if I measure from the outer diameter of the drill hole to the turned out diameter of the part, I will measure something like:
Top:0.436
Bottom: 0.435
Left: 0.432
Right: 0.438
Hole diameter is on size and no observable difference in diameter in any orientation.
Machine is a Mazak QT15 lathe. Tool is a Ultratool solid carbide jobber drill. Held in a Maritool ER32 collet tool holder with cheap Chinese collet. Material is 304 stainless. Chucked using aluminum soft jaws on previously turned surface. Soft jaws were machined in the past and have been on and off the machine multiple times.
If I use a HSS drill bit, the hole location is substantially less concentric.
It has been a long time since I indicated in the x-axis on this tool pocket.
So basically my question boils down to what is causing the hole to be on center on one axis but not other?
Thanks,
-Jim