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- A PV value must be calculated for each application. The continuous running
time should never exceed the corresponding T value as derived from the
Bevel Gear Jack Thermal Graphs for the following models:
To view the PDF files you must have the program Adobe Acrobat Reader. Acrobat Reader
is a free program. You can download it for free at
www.adobe.com or by clicking on the icon below.
- Data is calculated based on limiting the lifting nut temperature rise
from 70° F to 200°F (100° below dropping point of the grease).
- Check single lead vs. double lead screws in each case. A double lead
screw may be the appropriate choice, due to increased efficiency while
offering the same performance characteristics.
- If using Bevel Gear jacks as an integral miter gear box, contact factory
for horsepower and application data.
- Joyce Bevel Gear "S" series jacks are inherently self-locking to
eliminate coasting and allow more accurate positioning. A brake is
required for "D" series.
- Special jacks are available. Contact the factory for performance criteria.
- Bevel Gear series jacks are furnished with one shaft in position #2.
Jacks may be ordered with up to 3 shafts located at any combination of
position numbers 1, 2, or 3.
- The jack is designed for oil bath (EP-90 gear lubricant) or grease
operation. The upper bearing is grease lubricated through a fitting on
top of the jack, and the screw is grease lubricated by rubbing directly
on the screw. If the jack base is mounted other than horizontally with
the baseplate down, contact the factory for lubrication instructions.
Contact Joyce for applicable lubrication specifications.
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