The DM-13 differential micrometer offers sub-micron resolution in a unique design that achieves 13 mm of range with 0.2 mm fine adjustability in a single micrometer. It employs the same mounting bezel as our standard SM micrometers, so it may be used to upgrade Newport stages and mounts to provide significant improvement in resolution.
When manual resolution of much less than one micrometer is needed, a differential screw is recommended. A differential micrometer uses a spindle with two opposing screw threads of slightly differing pitches (P1 and P2). As the spindle rotates, the net travel of the micrometer tip is : 1/Peff = 1/P1 - 1/P2. This mechanism allows extremely small adjustments using commonly available screws.
The DM-13B is a DM-13 differential micrometer supplied with a mounting bracket specifically for use with our 462 Series stages. Note that the micrometer mounting bracket(s) supplied with the 462-series stages are sized for 1.0-in. (25 mm) travel. Therefore, the DM-13B includes a different micrometer mounting bracket which accounts for the shorter 0.5-in (13-mm) range, allowing symmetric travel about the 462’s nominal position.
The DM-13 combines 13 mm of coarse travel range with 0.2 mm fine adjustability in a single micrometer. Use the knob at the back for coarse positioning like a classical micrometer drive. When done, use the other knob for fine tuning your position with 0.07 µm adjustment sensitivity. The motion of the DM-13 is exceptionally smooth and crisp, without tightness or difficult turning. DM-13 provides excellent linearity and absolute accuracy better than 1%, and its unique design exhibits no harmonic motion errors typical of conventional differential screws.
The DM-13 employs the same mounting bezel as our standard SM Series Micrometers, so it may be used to easily upgrade an existing stage to provide, in most cases, a factor of 10 improvement in resolution. The DM-13 is compatible with 461/462, 561/562, 423/433, 426/436, 460P, 460A, 401/406, RS and GON Series Stages as well as many modular optical mounts.
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