Manual positioners

Guide

Goniometer Stages Guide

Goniometer

Goniometers are rotation stages that rotate about an axis that is located at a distance above the surface of the stage.

Used for direction adjustment and correction, or tilting and rotation of samples. Products with different guide mechanisms or feed mechanisms are also available.

Structures and Features

Structures and Features

Attachment Pins

Use of attachment pins to reduce assembly adjustment time.

Attachment Pins
Attention

In case of single shipment, this product is delivered only by mail.

  • αβ axis is easily assembled by attaching an attachment pin at the center of a GOHT series stage, and aligning the center of two goniometer stages.
  • Ideal not only for assembly of single axis stages, but also for positioning when mounting on instruments or devices.
Specifications
Part Number GOHT-AP-10
Compatible Products GOHT-40, 60
Primary Material SUS303
Finish None
Quantity [pieces] 10
Weight [kg] 0.0005

Ball Guide Method (GOHT/GOHTA Series)

These products are developed based on Sigma Koki’s original processing technology.

Features
  1. High Precision
  2. High Load Capacity
  3. High Stiffness
High Load Capacity and High Stiffness

The four-array contact structure achieves high load capacity and high stiffness (13 times stiffer than the V groove)

As shown in Fig-1, ball guides are machined across the arcs so that they have R groove structure and good contact with a ball allowing stable load capacity against the load in the directions where contact with the ball occurs frequently.

Ball Guide Method
High Durability

Long life and free of maintenance

Fig-2 shows the pressure distribution of the R groove and the flat surface.
As shown in the figure, pressure exerted on the R groove is dispersed and does not reach inside.
Thus, metal fatigue and wear are reduced.

High Precision

Our original processing technology achieved an integral structure
of the main body and the guides

As shown in Fig-3, because the crossed roller type goniometer stage, which has been the mainstream, has the guide separate from the main body, there are many parts. Assembling a large number of parts caused errors or variation, resulting in translation errors, that is, deviation in the most important rotation center when the stage moved. Our goniometer stage as shown in Fig-4, has the guide integrated into the main body in order to compensate for assembly errors or variation by machining accuracy. With the integral structure, the displacement of the rotation center is reduced.

High Durability

Rotation Center Displacement

Our ball guide goniometer stage φ0.007mm以下

Crossed roller goniometer stage manufactured by another company φ0.01mm以下

Reference

Measuring method of the displacement of rotation center.
Installing the “master ball” on the top of stage surface.
Then sequentially positioning in a certain direction from the starting point to the travel end. Measuring by three-dimensional measuring device the position of the master ball in each position.
From the coordinate data and obtains the fluctuation width of the circular orbit, determine the center of rotation displacement amount.

Rotation Center Displacement

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