Re: Pulley Shaft Lengths
itsakeeper
In order to calculate pulley shaft lengths you need to know the bearing manufacturers requirements for shaft length through the bearing. IE: for SKF SAFD pillow blocks they give you a chart in there 994 catalogue the give you the required dimension past the centerline of the bearing. You can also run the shaft through the pillow block if you choose. In either case you need to know the width through the pillow block.
For drive shafts the reducer manufacturer will give you the minimum distance required through the reducer as well as the dimensions. This of course depends on if it is a shaft mount or a coupled drive. On drive pulleys you will also need to determine the keyway locations for the pulley bushings.
Your pulley manufacturer will usually provide you with a shaft drawing if you give him the bearing size, bearing centers and the reducer being installed.
Gary Blenkhorn ■
Gary Blenkhorn
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Re: Pulley Shaft Lengths
Dear Mr. itsakeeper
Firstly, you already know the pulley face width. The plummer blocks are to be mounted on both the sides of face width. This normally considers 50 mm distance between the pulley face end and plummer block. If it is non drive pulley, the shaft will be ending within the plummer blocks.
If it is drive pulley having drive unit on one side, then one end of the shaft will be terminating in the plummer block but other end will be coming out of the plummer block. On this shaft end you have to consider the space required for mounting half portion of the slow speed coupling. You can consider about 25 mm gap between plummer block and coupling. The aforesaid dimensional values are for average situation. If the pulleys are very big in size, the dimensional values could be large. The shaft length as above is fixed while making pulley GA and application of mind in more detailed manner.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916 ■
Pulley shaft lengths
Is there a table or calculation for conveyor pulley shaft lengths?
Obviously if there is shaft mount reduced on the drive pulley the shaft would have to be longer but is there a standard length for this ?
Perhaps by Manufacturer, since different gearboxes would be of different widths? ■