Need Help!- drilling small deep holes in 304 ss

[jdwhittaker]

We're drilling 7/64" diameter holes 1-3/4" deep in 304SS, and the drill is walking by as much as .02" on the exit side of the hole. We're using an M51CO drill from Precision. Drilling at 16.4SFM and .003IPR per their recommendation. we're clearing chips every .075". They recommended .3", but we were afraid of breaking drillbits.
Anybody have any suggestions to help us keep our holes on location?

Thank you,

Dave

[john_100]

Hi Dave,

not knowing what machine your using I could be wrong but
could you not use say 2 or 3 drill bits starting with a "stub" drill then a series of longer bits

Welcome to New Dormer Site

follow the machining solutions link
and download the drilling pdf (second one down )
the picture is from this pdf

John

[keebler303]

A carbide drill bit is more rigid and should drift less.

A gun drill has a guide area just behind the cutting edges which rides in the drilled hole so that it is kept from wandering. Might want to look into that as well.

Deep Hole Gun Drilling

Matt

[Perfect Circle]

Check out the Titex Drills if you have through coolant.
Its what I use and have had no problems.
Good Luck~!

‪Titex A1822 vs XD30 Deep Hole Drilling‬‏ - YouTube

‪Titex A1822 vs XD30 Deep Hole Drilling‬‏ - YouTube