Concentricity

In Drilling 303, 304 & 316 Stainless Steel a Carbide Coolant Thru Drill is the ideal option.  It will give you the fastest cycle times along with the longest tool life.  With a Coolant Thru Drill you do not need to peck as the coolant thru will evacuate the chips but with a Non Coolant Thru Carbide Drill or HSS/Cobalt Drill you do need to peck to evacuate the chip (you will want to take 0.5 x Drill Diameter Pecks with these drills as shown below).  If you do not have a coolant thru spindle then a non coolant thru drill will also work well, you will just need to peck.  If it is shorter run and you want to keep your costs down then a Cobalt Drill will also work well.  Here are links to the Cobalt and Carbide Drill we recommend along with speeds and feeds:

*With Cobalt Drills you need to peck at Half the Drill Diameter to make sure chips evacuate (a 1/4" Drill should take 1/8" Pecks). You can run the drill 2XD on the initial plunge and then take 0.5XD Pecks to cut cycle Time

Runout

Run-out tolerance is a geometric tolerance that specifies the run-out fluctuation of a target’s feature when the target (part) is rotated on an axis (specified straight line). A datum is always necessary to indicate run-out tolerance; as such, it is a geometric tolerance for features related to datums.

The Ideal Solution is an Optimized Tool Path that accounts for the End Mill coming into corners as well as chip thinning so you are always at a constant chipload. If you are running an optimized Tool Path then Click Here for Speeds/Feeds in Stainless

The WM Series Coordinate Measuring Machine is a new handheld CMM designed accurate 3D and GD&T measurements over a large 15m (49 ft) area. Similar to the XM Series, the u...

We have found using a 5 or 7 Flute Variable Pitch End Mill ideally with a Corner Radius works best taking a Full Flute Length Axial DOC along with a Light Radial DOC (7%-11%) of the Tool Diameter when profile milling.  This allows you to utilize the Helix of the End Mill so that it leads into the cut lowering the tool pressure and keeping the heat formation down.  A Chipbreaker Style Rougher/Finisher End Mill is also ideal as it will keep tool pressure down and break the chips so that they get out of the way (a lot of the times the chips stay around the workpiece when using an End Mill without chipbreakers and re-cutting chips will break an End Mill).  Also, if you can have a Corner Radius then do it as it will double your End Mill over a Square Corner End Mill in Stainless (and then come in with a Square Corner as a Finisher).   Here are the End Mills we recommend for Profile Milling Stainless Steel:

How tomeasure runouton a shaft

Total run-out specifies the run-out of the entire surface of a part when it is rotated. To meet the total run-out requirement, the run-out of the measured value of the entire cylinder surface must be within the specified range.

Circular run-out specifies the run-out of any part of a circumference when a part is rotated. To meet the circular run-out requirement, the run-out of the measured value when the part is rotated must be within the specified range.

How tomeasure runoutwith dial indicator

The XM Series is a handheld coordinate measuring machine (CMM) that lets anyone easily measure 3D/GD&T features. The system is portable and shop-floor ready, so measureme...

Here are recommendations for Machining 303, 304 and 316 Stainless Steels.  Stainless Steel is tough on tooling but with the correct tools as well as speeds/feeds you can do well in machining Stainless Steel. First let's break down the differences between 303, 304 and 316:

*Remember to Cut the Feed Rate in 1/2 when coming into corners. Also, if you need to slot then your axial DOC should have 1/2 the Tool Diameter (For Example a 1/2" Diameter End Mill should take a Max Axial DOC of 1/4" when slotting to allow chips to clear)