Return to Concentricity Gauge

Neck Wall Uniformity Adapter

  • Neck Wall Uniformity Adapter

The Neck Wall Uniformity Adapter is an optional add-on to the Accuracy One Concentricity Gauge that makes checking case neck wall thickness uniformity fast and easy.

Neck Wall Uniformity Adapter Instructions:

  • Remove the right side roller block from the Concentricity Gauge and set it aside.
  • Insert the mandrel that corresponds to the caliber of the cartridge you wish to check into the adapter and tighten the thumb screw.
  • Place the adapter in the channel of the Concentricity Gauge base, so that it is about one inch to the right of the drive wheel, as shown in the drawing.

Neck Wall Uniformity Adapter Parts List

  • Center the indicator tip on the mandrel as shown in the drawing and lower the indicator until the tip is touching the mandrel.
  • Zero the indicator.
  • With the drive wheel raised, slide a case onto the mandrel, under the indicator tip.
  • Slide the left roller block, with stop pin, into position.
  • With the base of the case resting on the roller block and contacting the stop pin, note the location of the indicator tip.
  • The position of the roller block may be adjusted until the indicator tip is at the desired neck location.
  • Check to make sure that the case is horizontal.  If it is not, the height of the mandrel should be adjusted.
  • The mandrel height is adjusted by loosening the thumb screw and sliding the mandrel block up, or down on the pins as needed.  Tighten the thumb screw after adjustment.
  • Remove the case without changing the placement of the adapter or roller block to check that the indicator tip is still centered on the mandrel.
  • Replace the case.

Neck Wall Uniformity Adapter Instructions

  • Lowering the drive wheel and turning the knob, will rotate the case around the mandrel.  Neck wall runout will be displayed on the indicator.
  • It is important to note that to obtain the best results, case mouths must not be deformed.  We also recommend cleaning the inside of the neck of previously fired brass with a nylon bore brush before measuring neck wall thickness uniformity.