Fxdx pulley bolts snapped
#122
07-11-2023, 09:35 AM
Seasoned HDF Member
If the bolts go all the way through the hub, then there is enough elasticity in the bolt to maintain tension if the material should shift and relieve tension.. The problem is with shorter bolts, is that they stretch less elastically.. It's one of the reasons the threads are sunk in some increase the length of elastic part of the bolt.
Now going to a stiffer bolt, one that is less elastic, means the mating surfaces have to have less give so the tension is not lost.
Blue Bob is correct. Not enough material to dowel pin the pulley. A special bolt could be made that the slightest bit larger than the holes, make a special ream to size the hole perfectly. A lot of work and cost involved.
#123
07-11-2023, 09:59 AM
Road Warrior
If the bolts go all the way through the hub, then there is enough elasticity in the bolt to maintain tension if the material should shift and relieve tension.. The problem is with shorter bolts, is that they stretch less elastically.. It's one of the reasons the threads are sunk in some increase the length of elastic part of the bolt.
Now going to a stiffer bolt, one that is less elastic, means the mating surfaces have to have less give so the tension is not lost.
Blue Bob is correct. Not enough material to dowel pin the pulley. A special bolt could be made that the slightest bit larger than the holes, make a special ream to size the hole perfectly. A lot of work and cost involved.
Now going to a stiffer bolt, one that is less elastic, means the mating surfaces have to have less give so the tension is not lost.
Blue Bob is correct. Not enough material to dowel pin the pulley. A special bolt could be made that the slightest bit larger than the holes, make a special ream to size the hole perfectly. A lot of work and cost involved.
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Max Headflow (07-11-2023)
#124
07-11-2023, 10:10 AM
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I'll beat the dead horse a bit more ... To the best of my knowledge this hasn't happened on a wheel that hasn't been serviced, correct? In other words the factory assembled assy works as it is supposed to ... This would lead me to believe that a whole bunch of people aren't doing something correctly, or using parts that aren't designed for the application
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#125
07-11-2023, 10:13 AM
Road Warrior
I'll beat the dead horse a bit more ... To the best of my knowledge this hasn't happened on a wheel that hasn't been serviced, correct? In other words the factory assembled assy works as it is supposed to ... This would lead me to believe that a whole bunch of people aren't doing something correctly, or using parts that aren't designed for the application
#126
07-11-2023, 10:20 AM
Seasoned HDF Member
#127
07-11-2023, 12:40 PM
Seasoned HDF Member
#128
07-11-2023, 03:01 PM
HDF Community Team
Blue Bob: Don't those sleeves also fit snugly into the bores on the wheel? Surely they provide some resistance to independent movement between the two.
(OT) "Stud and nut systems are also driven by the tapper." Do you mean taper? If not, I don't understand... Taper is one way of eliminating relative movement between two parts.
I agree that Uncle Larry is on to something. It's not just one thing, though. Clean surfaces, correct hardware, correct torque, and some sort of locking, maybe more. Mess up any one and you could be looking at a bunch of broken parts.
(OT) "Stud and nut systems are also driven by the tapper." Do you mean taper? If not, I don't understand... Taper is one way of eliminating relative movement between two parts.
I agree that Uncle Larry is on to something. It's not just one thing, though. Clean surfaces, correct hardware, correct torque, and some sort of locking, maybe more. Mess up any one and you could be looking at a bunch of broken parts.
Last edited by John CC; 07-11-2023 at 03:03 PM.
#129
07-11-2023, 03:39 PM
Road Warrior
Blue Bob: Don't those sleeves also fit snugly into the bores on the wheel? Surely they provide some resistance to independent movement between the two.
(OT) "Stud and nut systems are also driven by the tapper." Do you mean taper? If not, I don't understand... Taper is one way of eliminating relative movement between two parts.
I agree that Uncle Larry is on to something. It's not just one thing, though. Clean surfaces, correct hardware, correct torque, and some sort of locking, maybe more. Mess up any one and you could be looking at a bunch of broken parts.
(OT) "Stud and nut systems are also driven by the tapper." Do you mean taper? If not, I don't understand... Taper is one way of eliminating relative movement between two parts.
I agree that Uncle Larry is on to something. It's not just one thing, though. Clean surfaces, correct hardware, correct torque, and some sort of locking, maybe more. Mess up any one and you could be looking at a bunch of broken parts.
Sleeves press fit with red Loctite.
#130
07-11-2023, 04:22 PM
Seasoned HDF Member
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