Linear Micro Actuators

The Linear micro actuators KT10-0903L measures 61 mm retracted and 71 mm fully extended, with a 10 mm stroke, 2.0 kg push-pull force, 2 mm/s no-load speed, above 10 kg self-locking force, 5 V DC at 0.2 A, 50 dB or less and IP56 protection. The body is 7075 aluminium alloy, the rod and thread parts are Hpb-59 brass, the surface is anodised, and the cable exits at the bottom.

Inside a head it covers 10 mm of travel and stops where the process needs it. The full stroke takes about five seconds, with no impact and no overshoot, so a filter slide moving next to an imaging path does not blur the frame. Self-locking above 10 kg holds the slide in place when power is cut, so an overnight shutdown or an emergency stop does not leave the optical path open to dust. At 61 mm retracted it drops into the space between the shell of a handheld unit or a benchtop head without changing the outside of the machine. 5 V DC at 0.2 A comes from the instrument's own 5 V rail, with no second supply to mount.

Both ends stop on an external limit board that cuts power to the motor; the rod carries no position signal, so if the machine needs to know which slot the slide has reached, position sensing stays on the machine side.

A benchtop optical inspection instrument (microscopy, metallography, vision measurement) usually carries a filter slide or a dust shutter inside the head. The action is specific: somewhere around 10 mm of travel, with the ability to stop at two or three intermediate slots; no vibration while the camera is exposing; no movement after shutdown, or the optical path collects dust; and only a few tens of millimetres of room inside the head, with no space for a separate power supply.

The four requirements map to the specification line by line:

If the machine has to complete the 10 mm move in about a second, the load is lighter and speed matters more: take the fast version KT10-0903H at 300 g and 9 mm/s, listed in the selection table below.

Short-stroke motion inside a machine is usually handled today by one of three parts: a solenoid, a micro air cylinder, or a lever an operator flips. The table below shows what changes when the KT10-0903L takes that place. The last row is what you actually have to modify.

The real work sits in assembly: a lug pair on the head, and a 5 V feed taken from the instrument. Nothing on the outside of the machine changes; 61 mm retracted and 10 mm stroke are fixed, so the modification is a mounting position, not a redesign.

When a rod does not fit into a head, the rod is rarely the reason: four dimensions were not checked. Run through these before mounting.

01 Travel envelope 61 mm retracted, 71 mm extended. The head needs 71 mm of continuous straight space, plus a bend zone for the cable. Lay out other parts against 61 mm and the rod will run into the neighbouring structure.

02 Front lug and pin Set the pin diameter first, then the lug block thickness, then check the bore in the front lug. Pairing a 3D-printed part directly gives an oversize bore; after a few hundred cycles there is play, and the stop position drifts.

03 Cable exit direction The cable leaves at the bottom. Once mounted, the bend must point away from the direction the rod extends, otherwise every stroke pulls the cable straight and it eventually breaks at the root.

04 Side load The rod outputs axial force only. The weight of the slide and its side clearance belong to the guide rail. Let the rod act as a rail and the 2.0 kg of thrust wears the rod before it moves the shutter.

If the first two do not line up, the head changes, not the rod.

The factory holds ISO9001:2015 quality management system certification; the certificates are on the certification page, the company background is under about us, and service terms are on why us.

Six instruments cover six checks before shipment: a quadratic element measuring instrument for critical dimensions and rod tolerance, an insertion and extraction force tester for the lug and pin fit, an insulation resistance tester and a DC low resistance tester for the electrical side, a salt spray chamber for surface treatment, and a wire bending machine for the strength of the bottom cable root. Photographs of the equipment are on the testing equipment page.

Other models and stroke options in the same family are listed under micro actuators; a head that needs longer travel can use the KT0805-100H at 100 mm stroke, 300 g and 9 mm/s.

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