MicroForm µFG100 Roundness Gage
MicroForm µFG100 Roundness Gage
MicroTIR Main Screen in Single Probe Configuration
MicroTIR Main Screen in Single Probe Configuration
MicroForm Roundness Software Results Screen
MicroForm Roundness Software Results Screen
Nobody makes such a nice and robust tilt and center assembly. The load rating exceeds any equivalent stage on the market and the workmanship is amazing.
Luke Gers
Optical Engineer
Callaghan Innovation (New Zealand)


Print This Page

Articulating Arm  –  Single Probe

(Max Part Size: 8” dia. x 12” tall, Max Part & Fixture Weight: 60 lbs)

Quickly and easily measure precision geometric forms with unmatched repeatability.  Our roundness gages incorporate an ABTech designed and built air bearing rotary table that delivers ultra-precision results. A powerful yet intuitive user interface simplifies navigation, displaying the results in a familiar way. These ease-of-use features allow operators of all skills levels to take exacting measurements on the shop floor or in the QC lab.

All MicroForm gages measure roundness, runout, flatness, concentricity (in and out of plane), parallelism and perpendicularity. They are used for a variety of manufacturing and quality functions including, in-coming inspection for vendor compliance, in-process tolerance confirmation, manufacturing process control and improvement, and quality control and part analysis.

For more detailed specifications read more in the tabs below or view the datasheet for this product.

To learn more about software for this product, view the MicroForm Software datasheet.

Features & Benefits

Accurate and Repeatable

An ultra-precision air bearing rotary axis is the foundation for all MicroForm gages. Combined with a highly responsive lever-type probe with nearly perfect linearity, our gages carry an overall system accuracy certification better than 5 millionths of an inch (5μ” or 0.125 μm). With no mechanical contacting parts to wear or create drag, air bearings produce virtually no friction. This translates into ultra-smooth, repeatable and maintenance-free operation. For statistical process control (SPC) and traceability, results and graphical charts can quickly be saved, printed, converted to PDF, or exported using the available Ethernet network connection.

Stable and Reliable

Frustrated by frequent measurement errors? That’s why our platforms are engineered to minimize the need to take repeat measurements. For added shop floor durability, and to maximize thermal and vibration stability, each air bearing is recessed in a finish machined metal base – with no branded plastic housing. And minimal cabling and connectors help reduce electrical interference that could distort your measurements. With such a robust design, you can be confident that your measurement result is from the part alone, and don’t include “noise” from outside influences.

Quick Part and Probe Setup

Our industry-best tilt and center worktable with very fine adjustments allow operators to precisely level and align parts to the bearing’s axis of rotation, reducing eccentricity. The spherical seat design maintains the part’s center point when leveling, saving you time and frustration in setting up the part for measurement.

An articulating gage arm lets you rapidly switch between a diameter and a face or from an OD to an ID. You won’t waste time wrestling with locks or swivel joints. Visible linear scales on both the horizontal stage and vertical post allow pinpoint alignment of the probe tip to the measurement surface. The articulating arm and probe mount feature detents at 90° for quick diameter or face access and drift free positions in between.

To further speed the measurement process, our MicroForm µFG150 and µFG200 models offer multiple gage stand configuration options and dual gage head capabilities. Add a second side mounted gage stand, or for further flexibility, replace the articulating arm with two universal style gage stands on a T-slot base.

Familiar User Interface with Touch Screen Navigation

We’ve designed our measurement program to display results in a fashion that is familiar for shop floor operators while providing full function analysis for quality control labs. In the case of a user interface often less in more. MicroForm’s intuitive software features two simple views on a large color touch screen monitor, delivering quick and easy results whether you’re a novice or experienced operator. Toggle between the main setup screen with active analog and digital runout meters, to the results screen with graphical polar and linear charts. A sidebar menu of all the form options along with measurement results are always visible And for novice operators, on screen “step-by-step” instructions are available. (Learn more about MicroForm software.)

Unique Dedicated Processing Power for Fast Measurements

Our gages are driven by a “real-time” operating system with dedicated FPGA processing platform and signal conditioners. These are the workhorses for performing the measurement algorithms, eliminating resource conflicts typical with systems running on PCs. The gage’s dedicated processor results in high speed data acquisition and instantaneously synchronizes the indicator displacement with a high resolution encoder for pin-point accuracy. This powerful processing platform not only provides tremendous system performance but also permits future system enhancements without the cost and downtime associated with hardware obsolescence.

A Spectrum of Analysis Functionality

To ensure quick and accurate measurements, surface interruptions can be automatically removed during a measurement or easily edited out using our drag and exclude feature. You also have the flexibility to analyze part harmonics (slope and lobing optional) right on the results screen or export the data for statistical process control (SPC).

User definable system preferences for customizing output and displays are readily accessible through the configuration button. Select from four reference circle types: Least Squares Circle (LSC), Minimum Zone Circle (MRS), Minimum Inscribed Circle (MIC), and Maximum Circumscribed Circle (MCC), Gaussian filter settings, units of measure, and other options to match your part drawing’s requirement.

Quickly print or save a PDF file to share the measurement results and graphical charts and document traceability. And each PC includes an Ethernet network card to provide remote file storage and enterprise connectivity.

MicroForm™ Software

for Precision Measurement

A straightforward interface which increases productivity, streamlines training, and offers the highest degree of operator flexibility. The full functionally is made easy so operators of every skill level can use our gages. The maximized interface accommodates different skill levels with on screen “step by step” instructions that don’t interrupt an experience user. All MicroForm gages offer a dual probe option to enhance the measurement process.

Read more about our MicroForm™ Software

Measurement Results Showing Interrupted Surfaces


Working envelope:

  • Axial load capacity (max centered and balanced): 60 lbs (27 Kg)
  • Max part diameter (swing): 8″ (200 mm)
  • Max part height (OD probe access): 12″ (300 mm)
  • Height to worktable: 8.75″ (222 mm)

Gage system certified accuracy:

  • Radial & Axial accuracy: <5.0 µ" (0.125 µm)
  • Tilt accuracy: <0.206 arc sec or 1.0µ"/in (0.025 µm/25mm)


  • Rotary air bearing table (Model AT100)
    • Integrated motor with clutch for manual rotation
    • 440 hardened stainless steel
    • Machined base dimensions: 10″ x 12″ x 3.5″
    • Air consumption: 2.0 cfm @ 60 psi
    • High resolution rotary encoder
  • Spherical seat 4 knob tilt and center adjustable worktable (Model TC4-150)
    • 6″ (150 mm) diameter worktable with 1.25″ (31.75 mm) thru hole with removable plug
    • Concentric “V” grooves in worktable equally spaced for rough centering
    • 1/4-28 tapped holes in worktable
    • Four fine pitch screw type spring-loaded knobs (2 centering, 2 leveling at 90⁰) for precise tilt and center adjustments
    • Maximum load capacity: 60lbs (27 Kg) (Limited by tilt and center worktable for effective spring movement.)
  • High output articulating gage stand with lever-type electronic gage head
    • Vertical drive assembly and horizontal slide for precision probe adjustment
    • Right angle horizontal arm assembly for quick arm articulation
  • Compact machined aluminum base
    • Contains “FPGA” based “real-time” operating system, encoder interface, signal conditioner, and power supply
  • Dual element air filter/regulator for air bearing supply (Model 00787A)
    • 5.0 micron pre-filter w/ regulator (0 – 150 PSI)
    • 0.5 micron second stage filter, oil/water removing (coalescing)
  • Windows10 “2-in-1″ PC with 13” color touch screen monitor, keyboard and mouse
    • Ethernet connection for network connectivity
  • MicroForm metrology software suite
    • Measure standard geometric forms:
      • Roundness, Flatness, Parallelism, Runout, Perpendicularity (Squareness) and Concentricity (in a single plane and in two planes) with reference axis setup
    • Setup screen with analog and DRO displays for checking TIR and part alignment
    • SAE and Metric units (standard and micro)
    • User definable Gaussian filter UPR’s and display/output and plot settings
    • Manual and automatic editing of interrupted surfaces
    • Harmonic analysis feature for identifying undulations per revolution (chatter)
    • Save and print measurement results
    • Save and access raw data for statistical process control (SPC) or further analysis

All specifications are at 60 psi and subject to change without notice.


  • TC8 style opposing knob fine adjust Tilt and Center worktable for precision alignment
  • Vacuum worktable and controller to hold sensitive lightweight parts safely and securely
  • Larger diameter and/or customized worktables (up to 8″ diameter)
  • Retrofitting services


  • Optional probe tips ( material and length)
  • Structural steel frames with passive vibration isolation leveling feet
  • Mobile cart to house electronics and optional printer
  • Fixtures (3-jaw chucks, Precision Centering Fixture “PCF-100”, etc.)
  • Certified 2µ” round master test ball and cover


  • Aerospace
  • Aviation
  • Automotive
  • Precision optics
  • Bearings
  • Semiconductors

MicroForm gages are used for a variety of manufacturing and quality functions including:

  • In-coming inspection for vendor compliance
  • In-process tolerance confirmation
  • Manufacturing process control and improvement
  • Quality control and part analysis

Similar Products:

    AT200 with TC8 Tilt & Center Worktable AT200 (8″ Ø)
    AT150 TC4 AT150 (6″ Ø)
    AT300 With TC8 Tilt and Center Worktable AT300 (12″ Ø)
    AT400 with TC8 Tilt and Center Worktable AT400 (16″ Ø)
    HDRT Heavy Duty Series HDRT550 (22″ Ø)
    HDRT Heavy Duty Series HDRT660 (26″ Ø)
    MFG150 GenII Diameter µFG150
    MicroForm Model MFG200 µFG200
Back to top


Thank you for your interest in ABTech’s ultra-precision measurement tools and services.
Please tell us a little about what you need to accomplish and we will be in touch to discuss any of the additional details that will help you choose your best option.

The machine is really an amazing piece of engineering craft. I hate to see your guys go. They were really great and patient with us. Marcela SternResearch Scientist
Columbia University’s Nevis Labs
Made in the U.S.A.

Every product we sell exemplifies our company-wide commitment to "Pride in Precision" craftsmanship. To that end, all of our products are designed, manufactured, and tested exclusively by ABTech at our New Hampshire facility.

Back to top