Tolerances

When asked the question "What tolerances can you hold" the typical reply is "It depends", as there are a number of factors that can influence process capability on a given component or assembly.  The information below is supplied as a guideline only.  Should you have specific questions about our ability to adhere to tolerances on your project, we would encourage you to contact us to discuss in more detail.

Machining:

Our customer's typically require +/-.005" on their drawings unless otherwise specified, however we see +/-.0005" on many of our customer drawings for key dimensions and critical characteristics. 

Turning:

PPG routinely holds turned tolerances to +/-.0003" and occasionally +/-.0002" on a complete spectrum of materials, ranging from Aluminum to High Temp Alloys.

Milling:

Capabilities include holding milled positional tolerances to +/-.0005" and occasionally +/-.0002" on adjacent features, to +/-.001" on non-adjacent or Datum oriented features.

Centerless Grinding:

Centerless Grinding available for achieving very close tolerance situations.

Precision Sheet Metal

Flat Stock:

  • Tolerances up to +/- .005" on a flat sheet to sizes up to 36" x 36" (laser)
  • Tolerances up to +/- .010" on a flat sheet from sizes between 48" x 96" (laser)
  • Tolerances up to +/- .020" on sizes between 58” x 142” (turret)

Formed Components:

  • Tolerances up to +/- .005" from feature to feature where the features are on the same surface (without bends between feature)
  • Tolerances up to +/- .010" from feature to bend - isolated.
  • Tolerances up to +/- .010" from bend to bend - isolated.
  • Tolerances up to +/- .030" in cases where there are multiple bends and multiple features, example a formed box with flanges.

Multiple form parts using - Drilled in place or CNC:

  • Tolerances up to +/- .005" on anything less than 36" with CNC or drill fixture.
  • Tolerances up to +/- .010" on anything larger than 36" with CNC or drill fixture.

Note: Tighter tolerances can be achieved with secondary machining operations