Worm gearboxes (R/U/W)
Compact right-angle worm reducers that give a high reduction in a small, quiet, low-cost unit and are self-locking at high ratios. Efficiency falls as the ratio rises and the lost power leaves as heat, so on continuous duty the thermal rating — not the torque — is usually the limit. SES holds the range as an authorised STM Team distributor, covering ranges R, U, RR, CR, W plus WMF variators; centre distances 25, 30, 40, 50, 63, 75, 90, 110, 130, 150 mm; inputs PAM/IEC & NEMA motor flange or free input shaft; output Hollow or solid shaft; QL quick-locking bush option. Executions include r, u, RR (combined), CR (combined), among others. It is specified most often into package and roller conveyors and mixers and dosing units. Every part is genuine STM Team through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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Type
Right-angle worm
Centre distances
25 to 150 mm
Ratios
7:1–100:1 single, higher combined
Ranges
R, U, RR, CR, W plus WMF variators
Where it runs.
You will find Worm gearboxes (R/U/W) in the parts of a plant where this particular duty actually occurs. In practice that means package and roller conveyors, mixers and dosing units, small hoists and gates, and equally packaging machinery, rotary tables. What links them is the duty rather than the machine name — type: Right-angle worm. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the STM Team range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. High ratio wanted in a compact right-angle envelope — Worm R/U/W to the centre distance and ratio Continuous running or high ambient temperature — Check thermal rating; consider a helical or bevel-helical unit Very high ratio from one drive — Combined RR/CR (worm + worm or helical pre-stage) Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Do not treat worm self-locking as a safety brake — specify a dedicated backstop or brake where a suspended load must be held. Send the designation off the failed part and we will confirm the STM Team equivalent and stock position.