How to Evaluate Planetary Gearbox Manufacturers and Suppliers

When comparing planetary gearbox manufacturers, give each supplier the same engineering specification. A useful comparison covers the exact ratio, motor interface, output loading, duty cycle and positioning requirement. Price and nominal frame size alone cannot show whether two proposed gearboxes will perform the same job.

Send one consistent request for quotation

Include the complete motor model and drawing, required output speed, working torque, recurring peak torque and motion cycle. Describe the machine connection and any radial or axial force. State the required backlash or positioning target, installation envelope, environment and planned quantity. Mark unknown values as items for review rather than silently treating them as zero.

The servo gearbox selection guide provides a starting point for the mechanical requirements. Use the motor interface checklist when comparing adapters from different suppliers.

Compare evidence for the exact proposed model

Avoid comparisons that look equal but are not

Check whether torque values describe continuous operation, acceleration, a brief overload or an emergency stop. Ask whether the selected ratio changes the rating. Compare speed limits under the same running conditions. A low backlash number also needs a measurement definition; it is not the same as guaranteed positioning accuracy for the complete machine.

Do not assume that matching frame numbers establish dimensional interchangeability. Review motor shaft engagement, locating pilots, bolt positions, output dimensions and installed length. If replacing an existing unit, supply its drawing and operating record alongside the part number.

Plan a sample acceptance check before ordering

Agree the checks that matter to the machine: incoming dimensions, correct ratio and rotation, motor assembly, temperature during the representative cycle, noise under stated conditions and motion performance under the intended load. Record the test configuration so that later batches can be compared against the same baseline.

Acceptance limits should be agreed with the supplier and machine team. Avoid creating an arbitrary temperature, noise or service-life requirement from a different gearbox's catalogue. Where a certificate or material declaration is required, name the document and scope in the enquiry and confirm that it can be supplied.

Clarify customization and repeat-order control

Ask which items are standard and which are project-specific. For ANDANTEX, the published OEM scope includes labeling, packaging and input/output interface modifications subject to review. Confirm the approved drawing, any customization charges, quantity and delivery schedule in the quotation.

For repeat orders, retain the accepted model code, ratio, interface drawing and revision. Agree how changes to the motor or machine load will be reviewed. A previously accepted gearbox should be reassessed when acceleration, operating hours or external forces change.

Build a practical shortlist

Start with suppliers that can evaluate your operating conditions and provide documents for the proposed configuration. Compare standard planetary and precision planetary options against the same requirements. Keep technical acceptance separate from commercial comparison until unsuitable configurations have been removed.

Frequently asked questions

Should I choose a manufacturer or a distributor?

Choose a supply route that provides the required technical accountability, documentation and service. Clarify who approves a custom interface, who supports selection and who handles warranty questions.

Does the lowest gearbox price mean the lowest project cost?

Not necessarily. Compare adapters, external supports, installation work, testing, shipping and support for the approved configuration. Use quoted costs rather than assumptions.

Send ANDANTEX your gearbox specification to request a model, drawing and quotation review.