MicroForm µFG200T Roundness Gage
MicroForm µFG200T Roundness Gage
MicroTIR Main Screen in Single Probe Configuration
MicroTIR Main Screen in Single Probe Configuration
MicroForm Roundness Measurement Results Showing Interrupted Surfaces
MicroForm Roundness Measurement Results Showing Interrupted Surfaces
“The fixture that you provided was exactly what we needed…”
Mark Michelsen
Manufacturing Engineer
Varian Medical Products


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Mini Tower  –  Single & Dual Probe

Max Part Size: 16″ dia. x 36″ tall, Max Part & Fixture Weight: 500 lbs

Measuring roundness for tall parts hasn’t been easy, or inexpensive – until now. With one of the most complete lines of roundness gages available, we’ve filled the void for handling tall parts without added expense or the programming expertise required on CNC controls and other gages. Our mid-sized mini-tower based gages incorporate easy-to-use manual probe setup to quickly and easily measure tall parts 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.

MicroForm gage platforms measure roundness, flatness, concentricity (in and out of plane), parallelism and perpendicularity.  Our unique RunOut feature simplifies part alignment and provides quick in-process shop floor checks. For precise part alignment and to reduce eccentricity errors, gages can be configured with an adjustable Tilt and Center worktable.

Currently have a gage that’s functional but isn’t quite cutting it?

If you don’t need a new gage we don’t want to sell you one. Save thousands of dollars by upgrading your current air bearing-based gage with a new MicroForm controller and software. We’ll also work with you to customize your platform to address unique applications.

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 that has excellent linear reliability with a correlation coefficient of .9999 (out of a possible 1.0000) over the full travel, 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.

Stable and Reliable

Frustrated by frequent measurement errors? Our platforms have engineered out the most common causes of errors such as thermal and/or vibration interference from interference from internal electrical components. The motor drive amplifier, power supplies and other electronic hardware are installed in the MicroForm controller isolating then from the part. Minimal cabling and connectors help reduce electrical interference that could distort your measurements. To maximize thermal and vibration stability, the air bearing is recessed in a granite base and the granite surface plates are mounted on structural steel frames with passive vibration isolation leveling feet. With this 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

Fine resolution adjustment knobs and visible linear scales on both the horizontal stage and secondary vertical post allow precise alignment of the probe tip to the measurement surface. To make multiple surface measurements quicker, an additional portable or fixed gage stand can be mounted on the granite surface plate and a second probe can be added.

You also have the flexibility to add an optional Tilt and Center worktable with very fine adjustments that allow operators to 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.

Our mini-towers are counterbalanced for easy motion while protecting the probe and your parts from accidental damage. A secondary vertical probe arm accommodates parts up to 36” in height allowing easy access to ID surfaces in deep bores. And the main tower is encoded so that the vertical position can be captured directly into the MicroForm measurement software.

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.)

Operators interface with Mircoform gage using a large 22” touch screen. Two simple screens are used to clearly lay out access and navigation. Operators can easily toggle between the main setup screen with its active analog and digital RunOut meters, to the results screen with graphical polar and linear charts. Measurement results and a sidebar menu of all the form options are always visible.

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): 500 lbs (226 Kg)
  • Max part diameter (swing): 16″ (406 mm)
  • Max part height: 36″ (914 mm)
  • Height to worktable: 41″ (1,041 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 AT200)
    • Integrated motor with clutch for manual rotation
    • 440 hardened stainless steel
    • Grade A granite base dimensions: 28″ x 18″ x 6″
    • Frame construction: welded steel base with vibration isolation feet
    • Air consumption: 2.0 cfm @ 60 psi
    • High resolution rotary encoder
  • Spherical seat type 8 knob tilt and center adjustable worktable (Model TC8-200)
    • 8” (203 mm) diameter with 1.51” (38.35 mm) thru hole with removable plug
    • Concentric ″V″ grooves in worktable equally spaced for rough centering
    • 1/4-28 tapped holes in worktable
    • Eight fine pitch screw type opposing knobs (4 centering, 4 leveling at 90⁰) for precise tilt and center adjustments
  • Mini Tower style gage stand with counterbalance (Model MT-36P/16A)
    • Vertical travel 36” (914 mm)
    • Horizontal travel 8” (203 mm) Coarse manual height and arm adjustments; position locks with fine gage head adjustments
    • 36″ (914 mm) secondary deep bore vertical arm with lever-type electronic gage head
    • Mount (second probe): MicroForm Ultra-fine adjust probe mount (#07000A)
    • Base mount (second probe): Gage stand is mounted to granite base on left side of rotary table
  • Granite surface plate and welded steel base frame
    • 18” x 28” x 6” grade A black natural granite surface plate
    • Contains “FPGA” based “real-time” operating system, encoder interface, signal conditioners, and power supply
    • Welded steel base with vibration isolation casters
  • Dual element air filter/regulator for air bearing supply (Model 00787AC)
    • 5.0 micron pre-filter w/ regulator (0 – 150 PSI)
    • 0.5 micron second stage filter, oil/water removing (coalescing)
  • Metrology Controller
    • Independent electrical box contains “FPGA” based “real-time” operating system, encoder interface, signal conditioners, and power supply
  • Mobile electronics cabinet with:
    • Swivel and locking casters for easy mobility
    • Adjustable shelf for keyboard and mouse
    • Shelf for MicroForm controller and PC with optional printer tray
    • Articulating touch screen monitor mount
  • Windows OS PC with 22″ color touch screen monitor, keyboard and mouse
    • Mounts included in mobile electronic cart
    • 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.


  • TC4 spring-loaded style fine adjust Tilt and Center worktable for precision alignment
  • Large diameter and/or customized worktables (up to 16″ diameter)
  • Second gage stand and probe with dual probe software upgrade
  • Retrofitting services


  • Optional probe tips (material and length)
  • Fixtures (3-jaw chucks, Precision Centering Fixtures “PCF-200”,etc.)
  • Certified 2µ” round master test ball sets


  • Aerospace
  • Aviation
  • Automotive
  • Precision optics
  • Bearings
  • Semiconductor

MicroForm gages are used for as 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)
    EAS3000-2T P07 Standard Configuration EAS3000-2T
    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)
    MicroForm Model MFG200 µFG200
    µFG300 Dual Stands µFG300
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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.

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 GersOptical Engineer
Callaghan Innovation (New Zealand)
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.

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