Solutions in Motion™

    [VIDEO] Right Angle Gearboxes: Answers to Common Questions

    Posted by Troy Branham on Aug 31 ,2020

    In this video W.C. Branham’s Chad Randleman answers some of the most common questions we receive regarding right angle gearboxes.

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    What gearing types are available?

    Gear types include crossed helical, spiral bevel and worm. Crossed helical offer the flexibility of 2, 3 and 4 way configurations simply by inserting keyed shafting through the bores. They can also be configured to offer right-handed or left-handed output rotation.

    Spiral bevel types can be configured in 2 or 3 way and offer in-line, same plane shaft alignment. They are also more efficient than crossed helical gears. Worm gearboxes are also highly efficient and can be configured with both solid shaft and hollow bore configurations.

    What ratios are your gearboxes available in?

    Both the crossed helical and the spiral bevel style gearboxes are common in low ratios. For the helical, we offer 1:1, 2:1 and 3:2 ratios. For the spiral bevel gearboxes, 1:1 ratios are the most common and 2:1 ratios are also available. For worm style gearboxes, higher ratios are the norm and we offer them both in 10:1 and 20:1 ratios.

    Are your gearboxes bi-directional?

    The answer is yes. Both our crossed helical and spiral bevel gearboxes, as well as the worm drive gearboxes, are bi-directional and the input shaft can be rotated in either direction. 

    How do you determine output rotation for crossed helical gears?

    As mentioned, crossed helical boxes can be produced with either right-handed or left-handed output rotation. When viewing from the proper angle (in this case from the bearing cap sides on both bores) an RH model would rotate CW/CW and a LH model would rotate CW on the input and CCW on the output.

    What are your required shaft and keyway fits and tolerances for your Insert-A-Shaft gearboxes?

    If a free-sliding fit is desired, your shafting should have a nominal dimension with a tolerance of +0.00/-.002 inch. The same goes for the keyway. If a free-sliding fit is desired, your keyway width should be nominal dimension of -0.00/+.002 inch. This will ensure that your shafting slides freely into the bores of the Insert-A-Shaft gearbox and no binding occurs. 

    Can gearboxes handle shaft loads?

    It’s important to analyze your application and determine if the shafts connecting to the gearbox will be applying a radial or axial load to the gearbox. While some gearboxes can take external loads to the shafts others require the shafts to be supported by external bearing blocks so that additional loads are not transmitted to the gearbox. It’s recommended to contact the manufacturer to determine suitability.

    What types of lubrication are common?

    There are two main types of lubrication that are commonly used in right angle gearboxes. One is grease — if the gearbox is not adequately sealed to use a fluid lubricant than normally a thick grease, like a grade 2, is used so that it can be retained in the gearcase. If the gearbox is sealed, like our CRL models, which include shaft seals, then a fluid lubricant like a 00 grade grease or gear oil may be used.

    Are there advantages to either type of lubricant?

    Grease will be more economical and suitable for most light duty and intermittent use applications. Oil offers the benefit of better, long term lubrication is preferable in higher service factor and continuous use applications.

    What are some mounting options?

    Most gearboxes come with integrated mounting holes in the gearcase so that the gearbox can be firmly mounted. Some gearbox styles like our Insert-A-Shaft models can be mounted by the installed shafts and “float” on the shafts if they are properly supported on the input and output.

    Can your gearboxes be mounted in any orientation?

    The answer is yes. The gearboxes are sealed in all axes and can be mounted in any orientation — vertical, horizontal, upside down — you name it. 

    Are gearboxes repairable?

    Yes, both our Insert-A-Shaft, helical gearboxes and our spiral bevel models. They're all simple to dis-assemble due to the screw on bearing caps and we always have parts available. Depending on the application, you may be able to on-site. Although, sometimes the gearbox or gearboxes may need to be returned to the factory to estimate and perform the repairs.

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    Topics: Videos, Right Angle Gearbox