Right Angle Gearboxes and Gear Reducers
A right-angle gearbox, also called a 90-degree gearbox, turns the drive 90 degrees between the motor and the driven load, so the motor can sit alongside the machine instead of extending behind it. GAM offers right-angle gearboxes and gear reducers in two precision gearing types. Hypoid gearing delivers servo-level ratios and performance, and spiral bevel gearing turns a corner or connects shafts at right angles.
As right-angle gearbox manufacturers, we design and mount the motor adapter for your motor and handle any customization, so you can start from a standard unit or a custom right-angle gearbox built for your application.
Hypoid Servo Right Angle Gearboxes
A hypoid gearbox offsets the pinion from the center of the driven gear, which creates a mesh that is mostly rolling with only slight sliding. The result is high efficiency, high load capacity, and ratios up to 15:1 in a single stage, with servo performance comparable to inline planetary gearboxes in a compact right-angle housing.
Dyna Series
The Dyna Series is GAM’s highest-precision hypoid gear reducer, with ratios up to 15:1 in a single stage and up to 100:1 in two stages. The DSX, GAM’s flagship right-angle hypoid gearbox, uses ground hypoid gears for backlash as low as 1 arcmin, with the smoothest torque transmission and the lowest noise in the line.
- DS-W: Single output shaft
- DS-H: Hollow bore output
- DS-F: Flange output
- DS-T: Dual output shaft
Dyna-Lite Series
The Dyna-Lite uses hypoid gearing for high torque, high efficiency, and high load capacity in a compact footprint. It comes in five output options, including shaft, hollow, and hollow for mounting to actuators.
- Single-stage ratios up to 15:1, two-stage ratios up to 150:1
- Efficiency up to 96%
- Tapered roller bearings for high radial load capacity
- Standard backlash under 6 arcmin
- Frame sizes 55, 75 and 90
- Drop-in replacement for many right-angle and inline planetary gearboxes
Spiral Bevel Right Angle Gearboxes
Spiral bevel gearboxes are also used in servo applications, but they do a different job than hypoid. They turn a corner or connect shafts at right angles, with ratios of 1:1 to 6:1 and efficiency up to 98%. The cube-shaped housing accepts input and output shafts on any side, or on all sides, to fit the layout of your machine. Smooth or keyed hollow outputs are also available.
GAM’s spiral bevel line includes the V-Series, the VC-Series with integrated motor mount, and the VP and VPC Performance Plus miniatures. See all precision right-angle bevel gearboxes.
Engineering Custom Right Angle Gearboxes
We offer custom right-angle gearboxes engineered to match your exact motor and operating requirements. Every product in our lineup can be tailored to your specifications. Our engineers design the motor adapter for your motor, mount it, and handle any modifications, from a standard unit with a custom adapter to a gearbox configured for specific torque and backlash requirements.
- Motor adapters designed and mounted by GAM for quick installation
- Multiple output configurations per series to match existing machine footprints
- An online sizing tool with access to over 9,000 servomotors to compare matching products
- Downloadable CAD models configured to your specifications in popular formats
Hypoid vs. Spiral Bevel Gearing
Both gearing types turn the drive 90 degrees, and both are used in servo applications, but they suit different jobs. Hypoid gearing reaches higher ratios and handles more torque. Spiral bevel gearing has the highest efficiency and the most shaft configurations, which suit turning corners and connecting shafts. Learn more in our article on right-angle gearing types and advantages.
| Feature | Hypoid | Spiral Bevel |
| GAM Series | Dyna Series, Dyna-Lite | V-Series, VC-Series, Mini and VP/VPC |
| Meshing Action | Mostly rolling, slight sliding | Rolling |
| Single-Stage Ratio | Up to 15:1 | 1:1 to 6:1 |
| Torque Capacity | Higher | Lower |
| Efficiency | High | Highest |
| Best For | Right angle servo applications | Turning a corner, connecting shafts, multiple outputs |
Get CAD Models & Tech Specs with our Online Product Catalog
search our catalogResources
explore all resources
Collaborate with GAM
We have the ability to customize & modify all our products. Our team of engineers will collaborate with you to produce your desired result.
Frequently Asked Questions
A 90-degree gearbox is another name for a right-angle gearbox. It turns the output shaft 90 degrees from the input shaft. GAM's 90-degree gearboxes use hypoid or spiral bevel gearing, and both are used in servo applications. Hypoid gearing suits higher ratios and torque, and spiral bevel gearing suits turning corners, connecting shafts, and multiple outputs.
An inline gearbox keeps the input and output shafts on the same axis. A right-angle gearbox turns the power path 90 degrees, so the output shaft is perpendicular to the input. This layout helps when space limitations or the machine layout prevent mounting the motor directly behind the load.
Typically, yes. Back-drivability depends on the gearing type and the ratio. GAM's high-efficiency hypoid and spiral bevel gearboxes are generally back-drivable, which helps in motion control setups that need system compliance or manual overrides.
Yes. Hypoid gearboxes can be mounted in any orientation as is. For spiral bevel gearboxes, we ask for your specific mounting orientation when you order, since it affects features such as the vent filter location.
GAM manufactures the Dyna-Lite in-house, and our engineers design and mount the motor adapter on every right-angle gearbox we sell. All customization is done by our team, so you work directly with the people behind your gearbox. GAM offers extensive product lines and the flexibility to customize gearboxes for your specific mechanical challenges.
PDF Resources
Contact the GAM Team
Have questions? Our team of experts can help! Give us a call at 888-426-7117 or fill out the form below and one of our team members will be in touch shortly.
*Required fields