Lab Jack Series
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Displacement Per Turn for L490 Lab Jack
The L490 Lab Jack utilizes a dual-pantograph design which offers excellent rigidity. The adjustment mechanism uses a lead screw to close the angle between the opposing pairs of supporting struts. Stainless steel axles and connecting rods allow loads of up to 75 lbs (34 kg) to be smoothly elevated over the full range of the L490. The top and bottom plates each have an array of nineteen 1/4"-20 (M6) tapped mounting holes on 1" (25 mm) centers. Mounting slots are provided on the top and bottom plates.
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Displacement Per Turn for L200 Mini Lab Jack
The L200 Mini Lab Jack offers the same highly rigid dual-pantograph design as the L490 but in a smaller package size. The adjustment mechanism provides smooth vertical motion while supporting vertical loads of up to 50 lbs. The top and bottom plates each offer a generous supply of tapped holes and counterbores, adding to mounting flexibility. A steel leadscrew with 1/8" hex socket accessible from the rear of the unit actuates height adjustment. (One 1/8" hex wrench included with each unit).
1" (25 mm) Vertical Adjustment Range
Parallel to Within ±0.005" Over Entire Range
200 lbs (90 kg) Static Load Capacity
The LJ750 is a compact vertical translation platform, 2" tall when fully collapsed, and 3" tall when fully extended. The large actuator knob is graduated in 10 µm increments allowing calibrated vertical height changes. 1/4"-20 (M6), 8-32 (M4), and 6-32 (M4) mounting holes are provided on the top platform. Additionally, the top platform can be rotated 360° and locked in place. A clamping arm (PM4, shown in the picture to the left) is supplied with the jack.
Thorlabs' PM3(/M) and PM4(/M) Clamping Arms use a nylon-tipped setscrew to secure objects in our mounts and V-clamps. The PM3(/M) provides vertical travel of up to 0.97" (24.6 mm) and features a 0.69" (17.5 mm) long clamping arm. In contrast, the PM4(/M) provides vertical travel of up to 1.61" (40.9 mm) and features a 1.16" (29.3 mm) long clamping arm.
The clamping arm is held to the post using a flexure mechanism that locks with a 5/64" (2 mm) balldriver or hex key. The post includes a Ø0.09" (Ø2.3 mm) through hole that provides added torque when tightening down the post.
The PM3(/M) clamping arm can be used to hold 1" (25.4 mm) tall optics with the addition of a second post. Without the second post, the top surface of the clamping arm will be positioned above the top of the post, causing less-than-full engagement of the flexure mechanism.