Prototype to Design-In and Production¶

A Custom Transmission Project Is Not Finished When the First Sample Moves¶

For an engineering team, the first prototype answers only one question:

Can this transmission concept work well enough to continue evaluating?

A production-ready configuration requires more than a successful first sample. The motor, gearbox, ratio, mechanical interface, operating point, materials, driver / encoder configuration where applicable, drawings and inspection requirements need to converge into a controlled configuration that can be manufactured repeatedly.

SigGear works with engineers through this development path for applicable compact transmission projects.

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Start From the Transmission Architecture¶

If the transmission architecture is already known, continue with the relevant engineering path:

Custom Planetary Gearbox Engineering Custom Cycloidal Transmission Engineering Custom Robot Joint Actuator Development

Typical Development Path¶

A project may move through:

Idea / Requirement / Existing Design
→ Feasibility Review
→ Transmission Architecture Review
→ Preliminary Configuration
→ Prototype / Sample
→ Application Test
→ Design Iteration
→ Design Freeze / Design-In
→ Pilot Preparation
→ Production Release

The exact sequence depends on how mature the customer's design already is.

A project based on an existing SigGear platform may move faster than a project that requires a different motor, ratio, interface or transmission architecture.

Stage 1 — Idea, Drawing or Existing Mechanism¶

The first discussion can start from:

a product idea
an existing mechanism
a customer motor
a current gearbox that needs to be replaced
a CAD model or drawing
a space envelope
a torque / speed target
a prototype that does not yet meet the required performance

A complete transmission specification is not required before the first engineering discussion.

Useful starting information includes:

application
what needs to move
load or torque requirement if known
output speed
available diameter and length
operating voltage where applicable
existing motor or controller if already selected
shaft and mounting constraints
prototype quantity
expected production volume if known

Stage 2 — Feasibility Review¶

The purpose of feasibility review is to determine whether the project has a credible engineering path before committing to a final configuration.

The review may include:

planetary vs. cycloidal transmission structure
existing SigGear platform vs. modified configuration
motor suitability
preliminary ratio
size and packaging
output interface
bearing and external-load conditions
driver / encoder architecture where applicable
parameters that still need calculation or testing

The result of this stage is not a guaranteed final design. It is a decision about which concept deserves further engineering work.

Stage 3 — Preliminary Configuration¶

Once the architecture is selected, the project can be narrowed into a prototype configuration.

Depending on the product family, this may define:

gearbox frame size
stage count and ratio
motor
motor-to-gearbox interface
output shaft or flange
mounting pattern
housing or packaging arrangement
encoder / sensor configuration
driver configuration
cable and connector arrangement
communication interface where applicable

At this stage, some details may still be provisional.

Stage 4 — Prototype or Sample¶

The first prototype should be built around a clear engineering question.

Examples:

does the assembly fit the available space?
does the motor + gearbox combination reach the required output speed?
does the joint handle the representative load?
does the selected ratio provide the expected motion?
does the shaft or flange interface work with the customer's mechanism?
does the selected driver / encoder configuration integrate with the controller?

The sample should not be treated as a frozen production design simply because it can rotate or transmit load.

Open the Sample Validation Workflow

Stage 5 — Application Test¶

The prototype should be evaluated in the actual or representative mechanism.

Useful test conditions may include:

continuous load
peak load and peak duration
output speed
acceleration and deceleration
duty cycle
direction reversals
radial / axial loads
temperature
current where applicable
noise or vibration where relevant
backlash or positioning behavior where relevant
encoder / communication behavior
power-off behavior if important

A test result is meaningful only when the operating condition is recorded.

Stage 6 — Design Iteration¶

A prototype that reveals a problem is not automatically a failed project.

The purpose of engineering validation is to identify what must change before the next build.

Depending on the project, iteration may involve:

ratio
motor
output shaft
mounting pattern
housing
axial length
bearing arrangement
cable / connector
driver
encoder
current limit
control configuration
thermal condition
assembly method

A change to one parameter can affect several others. For example, changing motor speed or ratio can affect torque, efficiency, gearbox length, thermal behavior and control settings.

Therefore, revisions should be treated as controlled configuration changes rather than isolated adjustments.

Stage 7 — Design Freeze and Design-In¶

Before the transmission is treated as designed into the customer's product, the exact configuration should be identifiable.

Typical items to freeze include:

product / project configuration
reduction ratio
motor
output interface
motor-side interface
envelope dimensions
mounting features
driver and encoder where applicable
cable and connector configuration
firmware / protocol revision where applicable
approved operating conditions
drawing revision

The goal is to make sure the customer, SigGear engineering and manufacturing teams are all referring to the same configuration.

Open the Design-In Checklist

Stage 8 — Pilot Preparation¶

Before a pilot build, the project should move from an engineering sample mindset toward repeatable manufacturing.

Items that may need confirmation include:

controlled drawing revision
configuration / BOM definition
inspection characteristics
incoming or outgoing test requirements
critical dimensions
assembly requirements
cable / connector definition
labeling or packaging requirements where relevant
pilot quantity
delivery schedule
change-control expectations

The exact documentation scope depends on the project and must be agreed with the customer.

Stage 9 — Production Release¶

A custom transmission should enter regular production only after the configuration and commercial scope have been confirmed.

Production release may require confirmation of:

final approved configuration
technical agreement or controlled drawing
order quantity
forecast or expected demand where available
manufacturing and inspection requirements
packaging / labeling requirements where applicable
approved changes from the prototype or pilot stage

SigGear does not treat an early sample, preliminary drawing or feasibility concept as an automatic production approval.

What Engineers Can Change During Development¶

Depending on the platform and engineering feasibility, development may include review of:

Area	Examples
Transmission	planetary / cycloidal structure, ratio, stage count
Motor	motor type, speed, power and mechanical interface
Packaging	diameter, length, housing and installation envelope
Input	shaft, pinion, pilot and mounting interface
Output	shaft, flange, mounting pattern and locating features
Bearing / load	radial, axial and overturning load arrangement
Feedback	Hall / encoder configuration where supported
Driver / control	integrated or external driver and supported control functions
Connection	cable, connector and communication interface
Operating target	torque, speed, backlash, duty cycle and thermal condition

Not every parameter can be changed independently, and not every requested change is feasible on every product platform.

Existing Platforms Can Shorten the Development Path¶

A project does not always require a completely new transmission.

Existing SigGear products can be used as engineering starting points.

Examples include:

8-42 mm planetary gearbox platforms for miniature and compact gear drives
32P with public motor-integration and mechanical-interface resources
SG-6010C / SG-6010D / SG-8021 planetary robot-joint reference platforms
CPM-80-25 / CPM-100-25 / CPM-78-39 cycloidal reference platforms

A project may use one of these products directly, modify the surrounding interface, or use the platform as a reference while another configuration is evaluated.

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Confidentiality and Customer Designs¶

Custom development often involves unreleased products, customer CAD, proprietary mechanisms and future production plans.

These projects may be protected by confidentiality agreements and therefore cannot be shown publicly.

SigGear uses public reference products, engineering resources, manufacturing information and released test data to show its technical capabilities without exposing confidential customer designs.

What SigGear Does Not Assume¶

Before a project reaches production release, do not assume that:

the first prototype is the final production configuration
a measured short-duration test point is a continuous rating
a driver feature from one model applies to another
a public simplified STEP replaces a controlled production drawing
a requested customization is feasible without engineering review
a prototype quantity automatically defines production MOQ or pricing
an application area listed on the website represents a public customer case

Start From Where Your Project Is Today¶

You may be at:

Concept
CAD design
Prototype
Current-product replacement
Sample validation
Design-In
Pilot preparation

Send the current drawing, motor, mechanism or problem.

SigGear can review what is already defined, what is still missing and what should be validated next.

Wanrong Wang
International Sales / Sales Engineer, SigGear
wangwanrong@siggear.com

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