Shaft Attachments Flashcards
When using heat to apply a shrink fit hub what is most important to remember?
Have the means to drive and locate the hub ready
What check should you do if a hub does not come off when the set screws are removed?
Check the depth of the set screw holes to the hub thickness
What methods heat parts evenly?
Oil bath
Oven
Induction
What sort of tool could be used to remove a hub off a shaft that is still in the machine?
Puller
Which tool is the best tool to get behind a hub to a housing and remove it?
Bearing splitter
What can affect the performance of a properly located bearing and the machine?
Any geometric or dimensional inaccuracy in the shaft
What are the 9 most common things that influence a shafts position?
Straightness
Roundness
Size/fit with bearing
Bearing seat concentricity
Bearing seat squareness
Radius fillets at shoulders
Deflection of shaft
Balancing
Component for keeping bearing in position
What is the primary requirement for bearing shafting?
Proper size
What can happen if diameters for bearing shafting are oversized? (2)
Overheating
Preloading
What can happen if diameters for bearing shafting are undersized? (3)
Fretting of the shaft
Loosing of the bearing
Excessive internal clearance
What is a basic requirement with bearing shafts other than size?
Correct surface finish
What are the three measurements for surface finish?
Micrometers (um) AA
Micro-inches (uin)
Root mean square (rms)
What do most anti-friction bearings surface finish up to?
0.3 um AA (12uin)
What do Babbitt and bronze sleeve bearings require a finish up to?
0.81um AA (32uim)
What is the retention of a bearing on a shaft affected by? (In terms of the shaft) (4)
Fit
Hardness
Finish
Deflection
What type of fit do most anti- friction bearings have?
Interference fit
What can happen if an anti friction bearing is fitted too loose?
Inner ring can creep on the shaft
Where can you find the bearings fit requirements?
On the manufacturer tables
What is a hub?
Machine element fitted to components for the purpose of enabling the component to be attached to a shaft
How is the method to position the hub dictated? (3)
Fit
Type of equipment
Style of hub
What are couplings used for?
To connect two shafts at their ends to transmit power
What are the two types of couplings?
Rigid
Flexible
What are rigid couplings designed for?
Connecting two shafts together to make a single unit
What care should be given when using a rigid coupler in terms of the shaft?
Straigh
Free of rust
Free of paint
Free of dirt
Free of burrs
Free of imperfections
In general what type of fit should a rigid coupler have with the shaft?
Locational interference
What type of mounting methods does a flexible coupler use?
Plain taper bushings
Flanged taper bushings
Tapered shaft lock but
What is another name for flanged taper bushings?
QD bushing
What does the means used for axial location depends heavily on?
Whether or not axial thrust is transmitted
How are gears attached?
Firstly keyed than use one of the following
Interference fit
Set screws
Tapered bushing
Locking collar and set screw
Pinning
Retaining rings
Tapered shaft with lock nut or screw
Moulding polymer
What is moulding polymer?
Cast material attaching directly to a knurled shaft
When would a feather key be used with a gear?
If the heat is required to slide on the shaft
What are the 3 methods of pinning to secure gears to shafts?
Straight pin
Tapered pin
Spring pin
What direction should you rotate the collar on a bearing race to tighten it?
Direction of shaft rotation
What type of bushing is shown?
Quick detachable bushing (QD)
What type of bushing is shown in the picture?
Split taper bushing
What type of bushing is shown?
Taper lock bushing
Where would you use a tapered lock sleeves?
On installations and assemblies for positive bearing location
