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Technical Supports

Technical Supports

Bevel Gearboxes FAQs

Does it matter which shaft I use as my input?
When using a 1:1 ratio gearbox it does not matter which shaft is used as the input as the speed will remain constant. However it is important to ensure that the correct shaft is used on higher ratios other wise the unit will end up increasing the speed. Please check below.
 
Can I use the bevel gearboxes as speed increasers?
All units can be used as speed increasers, by inputting on the output side of the gearbox, however it is important to check that the unit can handle the power and speed. When using as an increaser it is usually the input speed that is important, do not exceed the catalogue recommended maximum speed. Special units are available where the pinion can be put on the through shaft so that two outputs increase the speed, please request details on this.
 
When I look at the bevel gearbox shaft arrangement/rotational diagrams, how should I interpret these?
When looking at the bevel gearbox shaft arrangement diagrams, the gearboxes are shown in plan view, but the actual rotational arrows are representative of the output shaft rotations viewed from the end of the shaft looking directly at it. 
 
Is there a safety margin built into the power/torque figures for the bevel gearboxes?
There are safety margins built into the figures, but the tabulated figures should not be exceeded, so that the units work for efficiently and correctly for their intended life time.
 
What is the best method of fitting couplings to the shafts of a bevel gearbox?
It is very tempting to tap couplings onto the shafts using a hide mallet, but this is a method which is not recommend, as a sharp blow to the shaft end can damage the bearings. The preferred method of fitting is to use the tapped hole in the end of the shaft and a bar with a hole drilled through it. Put the correct size screw through the hole and wind the coupling on.
 
Are the bevel gearboxes supplied filled with oil?
For ocean freight, all bevel gearboxes are shipped pre-filled with oil.
For air express, air freight, all bevel gearboxes are shipped with dry conditions. 
When bevel gearboxes with low speed less than 100rpm, may be recommended to have semi-fluid or grease lubrication.
 
How often should I change the oil in the bevel gearboxes?
This depends on how often the unit is run and the type of oil that has been supplied with the unit (if pre-filled).
For all other units we recommend changing the oil every five months or 2,000 operating hours.
First oil change after 300 operating hours, therafter every 2000 operating hours.
 
What is the maximum recommended case temperature for a bevel gearbox?
The case temperature must not exceed 80 degree.C. Higher temperature, please consult JACTON.
 
Can you manufacturer me a bevel gearbox with special diameter shafts with special material etc?
Yes, for example, jt25 bevel gearbox with standard 25mm diameter shafts, but you required this sizes bevel gearbox, but the shaft diameter should be 30mm, after engineers checking, no problem for this diameter shafts; JACTON has the customer who required jt40 bevel gearboxes with stainless steel shafts materials, 10 days delivery time, we finish them for the customer.
 
How efficient are spiral bevel gearboxes?
The units efficiency ranges from 95~98%