NRDock
Cast Iron
- Joined
- Jan 24, 2015
- Location
- Central Pennsylvania
We have this ~60 year old design which currently has a 9" long cast iron hub keyed to a 7.5" diameter shaft. Various updating has gradually been done, and we've gotten to a point where we really need to shorten the hub and end of shaft by about 2". A known, but not very common, failure mode is through the existing keyway. Everyone agrees the hub has to be changed to steel.
At this point, we have two camps:
One camp wants to replace the keyed connection with a Ringfeder type locking assembly. Claims two keys can't share the load equally.
One camp wants to put two keys in the shaft/hub connection. Claims the locking assemblies are too hard to remove.
SO, can you highly skilled machinists put two keyways in both a hub and shaft accurately enough to share the load?
A guy on You Tube says the locking assemblies are easy to remove IF the correct (non-intuitive) procedures are followed, while extreme measures (maybe destruction) are required if the correct procedures are not followed. Hey, they are so simple, who would take the time to read the instructions, right?
I'm most interested in any input and experience from PM.
At this point, we have two camps:
One camp wants to replace the keyed connection with a Ringfeder type locking assembly. Claims two keys can't share the load equally.
One camp wants to put two keys in the shaft/hub connection. Claims the locking assemblies are too hard to remove.
SO, can you highly skilled machinists put two keyways in both a hub and shaft accurately enough to share the load?
A guy on You Tube says the locking assemblies are easy to remove IF the correct (non-intuitive) procedures are followed, while extreme measures (maybe destruction) are required if the correct procedures are not followed. Hey, they are so simple, who would take the time to read the instructions, right?
I'm most interested in any input and experience from PM.