SPLF90 Epicyclic Planetary Gearbox For 750 W Servo Motors

Where the 90 mm frame sits in a drive train

A 90 mm square flange with a Ø80 mm spigot and a Ø20 mm output shaft is the frame that follows a 750 W servo. It is the step up from a 60 mm unit when the axis has real mass behind it: 3D printers and desktop machines still appear here, but so do CNC machines, textile machinery and cutting machines, where the load is continuous rather than intermittent.

The gear train: what "epicyclic" actually means

An epicyclic planetary gear set has three working parts. A sun gear sits in the centre, three planet gears ride around it on a carrier, and a ring gear encloses the whole group. Drive the sun, hold the ring, and the carrier turns slower than the input by a fixed ratio - that is the reduction, and because the load is shared across three meshes at once, a gearbox planetary train carries far more torque than its diameter suggests. Turning that backwards, a planetary gearhead of this size holds 100 N·m inside a 132 mm × 90 mm envelope.

The SPLF90 uses one such train in the L1 build and two in the L2 build. Each additional reducer planetary stage multiplies the ratio again and adds its own backlash, which is why the accuracy grade and the efficiency both step down between the two versions.

Torque per ratio, not one headline number

The datasheet gives holding torque against each individual ratio, so the figure you need is the one on the row you are actually ordering. Both tables below are transcribed straight from the SPLF90-L1MA and SPLF90-L2MA sheets.

The 750 W servo nose: Ø19-40 / Ø70-3 / Ø90-M6

The input is defined by three figures and all three have to match the motor. The shaft is Ø19 mm and 40 mm long; the spigot is Ø70 mm, seated 3 mm deep; the bolt circle is Ø90 mm with M6 screws. In the drawing that appears as Ø19g6 on the shaft and Ø70H7 on the bore. That is the standard 750 W servo nose, which is what lets this frame mount directly without an adapter plate. Where a servo motor and gearbox are bought as one package, these are the three figures that have to agree between them. The servo shaft is gripped by a clamp rather than a keyed bore.

Output side and the 90 mm mounting envelope

Two stage counts, two accuracy grades

Choosing between the two builds is a trade between reduction range and precision. The single-stage L1 keeps the tightest accuracy and the best efficiency; the two-stage L2 buys the higher ratios and pays for them in backlash and losses.

Common figures across both units

The nameplate carries the build in short form. A unit marked SPLF90-05MA is a single-stage 90 mm frame at ratio 5, and it leaves with a serial number stamped on the same label, which is how a unit is traced back to the ratio and motor interface it was assembled to.

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