Indexing Attachment


SKU: 3200 Categories: ,

Product Description

Many times a machinist is required to machine features into a part that are located in a radial pattern instead of linearly. Examples of such features are the flats on a nut, the teeth on a gear, or the splines on a shaft. The Sherline indexing attachment is a unique design that provides a very economical means of accurately rotating a part so that these kinds of features can be machined.

The attachment consists of:

  • An indexing head and a tailstock mounted on a 12″ long dovetailed bed
  • A rack gear that is used to measure radial movement
  • A gear tooth cutter holder
  • A high-speed steel tool blank

The indexing head utilizes a spindle with a #1 Morse taper and a 3/4-16 male thread identical to the spindles on the Sherline lathe and milling machines.

This enables the use of all the Sherline accessories such as the faceplate, 3- and 4-jaw chucks, Drill Chuck, and centers with the indexer. A built-in mechanism detents the spindle every 5°, and there is also a red laser engraved collar that indicates rotation in 1° increments.

The rack gear mentioned previously provides a means of accurately positioning the spindle where positioning in other than 5° increments is required. The gear inserts into the indexing head and engages an index gear. This transfers the rotary motion of the spindle into linear motion that can be measured with the depth rod of a Vernier caliper. Simple calculations then permit accurate indexing to an infinite number of positions.

The indexing attachment can be attached directly to the table of the Sherline milling machine, or the indexing head can be used by itself in a horizontal position similar to a rotary table. The indexing attachment is not recommended for use on the Sherline lathe with the vertical milling column; however, with the use of shims to elevate the unit high enough to clear the crosslide handwheel, it can be done.

The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.


Always wear safety glasses when operating machine tools.

Download PDF 3200 Instructions

Instructions PDF Download

Part No. Description Quantity
3058 Hold Down Set 1
3217 Gear Tooth Cutter 1
3225 Indexing Tailstock Assembly 1
32001 Indexing Head Assembly 1
32010 Indexing Bed 1
32120 Boston Rack 1