How to Write an RFQ for Low Backlash Gearboxes (So You Get a Usable Quote)

Many RFQs look complete but still trigger three rounds of clarification. The usual reason is simple: the email contains target model names, but not enough operating context to support technical judgement.

Baseline RFQ package

Include these fields in the first email:

• Application and axis function (indexing, continuous drive, positioning, lift, etc.)
• Target ratio and allowable alternatives
• Rated torque, peak torque, and duty cycle
• Backlash target and positioning expectation
• Motor brand/model and interface constraints
• Installation envelope (length, diameter, right-angle need, mounting side)
• Environmental limits (temperature, washdown, dust, vibration)
• Quantity plan (sample, pilot batch, annual forecast)

Pre-send quality check

Use this internal check with your team:

If fewer than 4 sections pass, expect multiple quote clarification rounds.

Data that prevents late redesign

In replacement projects, add:

• Existing model code and brand
• Existing drawing or key dimensions
• Known failure points (heat, noise, backlash drift, seal wear)

In new designs, add:

• Candidate motor inertia and speed range
• Load inertia estimate
• Acceleration/deceleration profile

This allows suppliers to flag mismatch risks before procurement commits.

How to judge supplier replies

A quote is decision-ready only if it includes:

• Model code plus equivalent alternatives
• Backlash class and test condition
• Nominal/peak torque by ratio or stage
• Interface details (flange, shaft, bolt pattern)
• Lead time split (sample vs batch)

If these are missing, you are comparing prices, not solutions.

RFQ email template you can reuse

Use this structure to reduce ambiguity:

Subject: RFQ - Low Backlash Planetary Gearbox for [Application]

Hello team,

We are evaluating gearbox options for [machine/axis].

1) Application context
- Axis function:
- Duty cycle:
- Ambient condition:

2) Performance target
- Ratio target (alternatives allowed):
- Rated/peak torque:
- Backlash target:

3) Interface constraints
- Motor brand/model:
- Mounting envelope:
- Output format requirement:

4) Commercial scope
- Sample quantity:
- Pilot quantity:
- Annual forecast:
- Target timeline:

Please provide model recommendation, key parameters, and sample/batch lead time separately.

Attachments that improve first-round accuracy

Attach at least one of these when possible:

• Existing reducer drawing or key dimensions
• Motor drawing or datasheet
• Axis layout screenshot with space constraints

Even partial files can significantly improve first-round quote quality.

Working rule

Treat RFQ writing as an engineering handoff with commercial context attached. When the input is concrete, quote comparison becomes much faster and much fairer.