Laser 2000

Extended Contact Ball Bearing Guide

We offer a wide range of goniometer rotation stages including the GOHT and GOHTA series, these also come with the extended contact micrometer version. For more information or specifications please see the specifications tab below or contact our experts.

Extended Contact Ball Bearing Guide Method (GOHT/GOHTA Series)

GOHT steel micrometer-driven EXC™ Precision-Bearing goniometers are an absolute marvel of translation stage engineering. They are the first and only goniometer to feature curved EXC™ precision bearing ways that are processed directly into the body and base. This construction results in the highest stiffness, load capacity and smoothness of any stage on the market. The EXC™ patented bearing technology also provides the GOHT with low-friction, high-resolution movement as well as rotation axis displacement that is 1/10th the magnitude of dovetail bearing goniometers. As with all goniometers, the axis of rotation is situated parallel to and above the mounting platform but they are also designed to be stacked so to have intersecting orthogonal axes of rotation. In this configuration, they have capability for orbit-like positioning about a single point. This family of GOHT stages are micrometer driven for recordable movements and include a carriage lock. All are made entirely from hardened tool steel and are plated with an RoHS-Compliant black chrome.

GOTHA goniometers are large platform all-aluminum stages with exceptionally high rotation-axis heights, the largest being 228 mm (almost 9 inches high). They are driven by a high-tolerance worm-gear mechanism which, along with its high precision ball-bearing guides, yields angular position readable to 1 arc minute using the vernier scale. As with all goniometers, the axis of rotation is situated parallel to and above the mounting platform but they are also designed to be stacked so that they have intersecting orthogonal axes of rotation. In this configuration, they have capability for orbit-like positioning about a single point. The GOTHA series of goniometers are lockable and finished in a RoHS-compliant black anodize.

Features:

High precision, high load capacity and 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.

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. Data for durability is listed. E015

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.

 

GOHT-65 Specifications, Please find full list on the downloadable datasheet.

Specifications
 

 

Part Number

METRIC GOHT- 65A50B-M6 GOHT- 65A75B-M6 GOHT- 65A100B-M6 GOHT- 65B50B-M6 GOHT- 65B75B-M6
INCH GOHT- 65A50BUU GOHT- 65A75BUU GOHT- 65A100BUU GOHT- 65B50BUU GOHT- 65B75BUU
 

 

(Opposite Model)

METRIC GOHT- 65A50BR-M6 GOHT- 65A75BR-M6 GOHT- 65A100BR-M6 GOHT- 65B50BR-M6 GOHT- 65B75BR-M6
INCH GOHT- 65A50BRUU GOHT- 65A75BRUU GOHT- 65A100BRUU GOHT- 65B50BRUU GOHT- 65B75BRUU
Stage Size [mm] 65×65 65×65 65×65 65×65 65×65
Axes of Travel α axis αβ axis
Rotation Center Height [mm] 50±0.1 75±0.1 100±0.1 50±0.2 75±0.2
 

Angle Range [ ° ]

(Upper) β axis ±20 ±15
(Lower) α axis ±20 ±15 ±10 ±15 ±10
Vernier Readable Resolution 0.1° 0.1° 0.1° 0.1° 0.1°
 

Travel per Knob Rotation [ ° ]

(Upper) β axis about 1.70 about 1.22
(Lower) α axis about 1.70 about 1.22 about 0.95 about 1.22 about 0.95
Rotation Center Displacement [mm] φ0.007 or less φ0.007 or less φ0.007 or less φ0.007 or less φ0.007 or less
Guide Method Extended contact ball bearing guide
Primary Material SUS440C quench hardened
Finish Super black chrome
Load Capacity [N] 98 (10kgf) 98 (10kgf) 98 (10kgf) 98 (10kgf) 98 (10kgf)
 

Max. Moment Capacity

Pitch [N・m] 3.5 3.5 3.5 3.5 3.5
Roll [N・m] 6.5 6.5 6.5 3.5 3.5
Yaw [N・m] 3.5 3.5 3.5 3.5 3.5
 

Moment Stiffness

Roll [″/N・cm] 0.3 0.3 0.3
Yaw [″/N・cm] 0.3 0.3 0.3
Parallelism [μm] 30 30 30 30.0 30.0
Weight [kg] 0.75 0.75 0.75 1.5 1.5

 

GOHT-40 Extended Microscope Specifications, Please find full list on downloadable datasheet.

Specifications
 

Part Number

METRIC GOHT-40A20BMS GOHT-40A40BMS GOHT-40A60BMS GOHT-40A75BMS
INCH GOHT-40A20BMSUU GOHT-40A40BMSUU GOHT-40A60BMSUU GOHT-40A75BMSUU
 

(Opposite Model)

METRIC GOHT-40A20BMSR GOHT-40A40BMSR GOHT-40A60BMSR GOHT-40A75BMSR
INCH GOHT-40A20BMSRUU GOHT-40A40BMSRUU GOHT-40A60BMSRUU GOHT-40A75BMSRUU
Stage Size [mm] 40×40 40×40 40×40 40×40
Axes of Travel α axis
Micrometer Position Side Side Side Side
Rotation Center Height [mm] 20±0.1 40±0.1 60±0.1 75±0.1
Angle Range [ ° ] ±11 ±7 ±5.5 ±4.5
Travel per Knob Rotation [ ° ] about 0.9 about 0.55 about 0.42 about 0.35
Rotation Center Displacement [mm] φ0.007 or less φ0.007 or less φ0.007 or less φ0.007 or less
Guide Method Extended contact ball bearing guide
Primary Material SUS440C quench hardened
Finish Super black chrome
Load Capacity [N] 58.8 (6.0kgf) 58.8 (6.0kgf) 58.8 (6.0kgf) 58.8 (6.0kgf)
 

Max. Moment Capacity

Pitch [N・m] 2.0 2.0 2.0 2.0
Roll [N・m] 3.0 3.0 3.0 3.0
Yaw [N・m] 2.0 2.0 2.0 2.0
 

Moment Stiffness

Roll [″/N・cm] 0.6 0.6 0.6 0.6
Yaw [″/N・cm] 0.6 0.6 0.6 0.6
Parallelism [μm] 30 30 30 30
Weight [kg] 0.2 0.2 0.2 0.2

 

GOHT Datasheet
GOHTA Datasheet
BACK
TO TOP

Request a Demo

Extended Contact Ball Bearing Guide

Ask the Expert

If you’re interested in the products shown here, or have questions about something you can’t find on our website, please get in touch through the form below.

Our knowledgeable sales team will be happy to help. We can normally source exactly what you need, or work with you to come up with custom solutions.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to the Photonics team.

Ask the Expert

If you’re interested in the products shown here, or can’t find exactly what you need, please get in touch with our specialist through the form below.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to Toby.

Toby Scrivener

MPhys (Hons)

Ask the Expert

If you’re interested in the products shown here, or can’t find exactly what you need, please get in touch with our specialist through the form below.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to Karen.

Karen McGeachy West

MPhys (Hons)

Ask the Expert

If you’re interested in the products shown here, or can’t find exactly what you need, please get in touch with our specialist through the form below.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to Peter.

Peter Collins

Peter Collins

BEng (Hons), MSc (Eng)

Ask the Expert

If you’re interested in the products shown here, or can’t find exactly what you need, please get in touch with our specialist through the form below.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to Sian.

Siân Brooks

BSc (Hons)

Ask the Expert

If you’re interested in the products shown here, or can’t find exactly what you need, please get in touch with our specialist through the form below.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to Dan.

Dan Young

BSc (Hons)

Ask the Expert

If you’re interested in the products shown here, or can’t find exactly what you need, please get in touch with our specialist through the form below.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to Paul.

Paul Williams

PhD

Ask the Expert

If you’re interested in the products shown here, or can’t find exactly what you need, please get in touch with our specialist through the form below.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to Lisa.

Lisa Thomson

MPhys

Ask the Expert

If you’re interested in the products shown here, or can’t find exactly what you need, please get in touch with our specialist through the form below.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to Shannon.

Shannon O’Connor

BSc (Hons)