Test fixtures are an essential part of any production line testing process.  They are the direct link to the test system itself.  By using quality test fixtures you will ensure high levels of accuracy and repeatability.  At ESW we understand this and engineer test fixtures that will work flawlessly with your test system.  Our primary concerns are to maintain a Kelvin connection to the part and minimize tooling change downtime.  

Both right-handers and left-handers are able to use these fixtures with ease.

Stator & Field Test Fixtures

Clip Blocks

Our standard clip block design can accommodate most parts. The Kelvin clip block is spring loaded. It continues to receive excellent reviews from our customers, particularly the operators.

The spring loaded lever makes it easy for the operator to load and unload the parts.  They simply push back on the proper lever and insert or remove the lead.

Standard & Adjustable V-Blocks

To prevent tipping and movement of the parts, they are placed onto a fixture. This fixture makes loading and unloading of a part safer and easier for your operators. Our Engineering staff will review your parts and design a fixture that will best accommodate them.

Our standard block is adjustable to accommodate your various parts. To adjust the block, the operator loosens two wing nuts, adjusts the posts to the desired width and tightens down the nuts. The parts are loaded into the block by sliding it between the two (2) posts.

Also available is our adjustable V-Block. This design permits the part to merely sit on top of the block. It provides the stability needed without the task of inserting the part between two posts. If rotation testing is performed, a V-block fixture can be mounted on ball bearing slides. The part is placed on the V-Block, pigtail connectors are hooked up to the part and the complete fixture slides the part over the Rotation Probe.

Quick Change Test Fixtures

The Quick Change Test Fixture makes changing from one part to another quick and simple.  With our unique design you can change in a little as 60 seconds.  This test fixture design uses two (2) separate parts; a base contact pad and a test socket top. 

Base Contact Pad remains permanently mounted to the testers workstation. 

• Wire movement has been eliminated thus reducing the potential for broken or damaged wires.  

• The wires terminated with a wire connector that grips the insulation, which assists in preventing wire breakage at the solder connection.

• Never has to be removed from your workstation.

Test Socket Top (shown on right with an attached locator assembly) is where the armature is actually inserted.  The tops are  removable and interchangeable.  Tops consists of a donut, Kelvin contact pins, a centering bushing and cover. It is placed on top of the base contact pad and is held in place with two (2) bolts. This test socket top is easily removed and the center bushings can be changed quickly and easily without worrying about wire breakage; as there are no wires exposed.

• Kelvin connection is maintained.
• A mar-free commutator connection is maintained.
• Design accommodates the testing of two or more parts with different commutator bars (ie: 8 and 16, 10 and 20, or 12 and 24).
• The contact pins have a leading edge angle of 30° followed by an angle of 7° to allow for easy insertion of the commutator and to make contact with the leading edge only.  This not only reduces pin wear it also eliminates any markings on the brush tracks of the commutator.
• Pins are constructed of a hardened steel to reduce wear.
• The symmetrical shape enables the right and left pins to be interchanged.  This eliminates the need to stock more than one type of pin.  The pins can also be turned over and used again.  This doubles the life of each contact pin.  When one pin becomes damaged or worn, only that pin will need replacing.
• Replacement for other manufacturers test sockets.
• Mechanical reliability.
• Pneumatic version is also available.
• The quick-change test sockets can accommodate a 2mm change in commutator diameters.  

This test fixture model is cost effective and easy to use.  When parts are added to production only the top needs to be replaced, not the entire fixture.

Automatic test fixtures are designed for both manual load/unload testers and fully automatic on-line testers.  They are custom designed to specifically fit your automatic line. The test head can either move to the part or the part can move to the fixture, depending on your requirements.

Complete handling of the part can be obtained by mounting the test head to a slide assembly, index assembly and a lift block.  Or an operator can manually load a part into a V-Block Assembly (see V-blocks shown above) and then move the slide into the socket.

Index assemblies are adjustable to handle various size shafts.  

Pneumatic Test Fixtures

The pneumatic test fixtures are designed for both manual load/unload testers and fully automatic on-line testers. The fixtures are interchangeable with our existing quick change fixtures from our Models 2000, 5000 and 6000 series testers.

Customers who are currently using our removable or quick change test fixtures can be converted to the pneumatic test fixtures at any time.

The pneumatic test fixture accommodates a 6 mm change in commutator diameters.  

The pogo pins are air activated.

The model 10TJ is a universal armature test fixture which will accommodate most armatures.  The adjustable V-Block and contact probes allow quick set-up and testing of various sizes and types.

The test fixture is equipped with three dual pin contact probes.  This enables you to set up for both End-to-End and Bar-to-Bar measurements.  A toggle switch on the fixture base selects the mode of operation.

The contact probes are dual pin (Kelvin) for low resistance measurements.  The Kelvin dual pin system provides one pin for the current path, while the other provides a circuit path for sensing.

Click here for 10TJ diagrams and ordering information.