J.R Posted April 17, 2021 Report Share Posted April 17, 2021 My conveyor drive shaft is keeps on breaking on the middle. Drive shaft with two gearbox attach to both end of shaft. 25hp motors with speed set to 30 but gear box speed is at 6. Shaft keeps on breaking on the center. Any ideas why? Quote Link to comment Share on other sites More sharing options...
0 Julius Oshemughen Posted July 24, 2021 Report Share Posted July 24, 2021 I need Auto Cad self learn book or instructions manual. Quote Link to comment Share on other sites More sharing options...
0 SuryaTeja Posted July 25, 2021 Report Share Posted July 25, 2021 The shaft is unable to take the torsinal load 1)try with a shorter shaft or change the materal of the shaft or increse the polar moment of ineria of the shaft Quote Link to comment Share on other sites More sharing options...
0 G B Reid MIMechE Posted August 3, 2021 Report Share Posted August 3, 2021 The most likely reason is "fatigue" (high quality close-up images of the broken surface could confirm this). If you bend a bit of metal back and fourth, it will snap...that's an extreme example of fatigue. Fatigue happens when an item is loaded and unloaded multiple times and can cause items to fail when there is very little actual use due to the cyclical nature...it is effectively crack propagation within the lattice structure of the metal's crystalline structure. [its not even "real" cracks, it is incomplete crystals shunting individual atoms across internally within the lattice...they multiply until they become significant.] It is a little complex in reality, but a general rule of thumb is if the item subject to fatigue is designed to Load/0.3, it should significantly increase the lifespan....and use the yield point for the calcs, not the UTS. Good luck Bruce Quote Link to comment Share on other sites More sharing options...
0 GBH Posted August 3, 2021 Report Share Posted August 3, 2021 On 4/17/2021 at 3:23 AM, J.R said: My conveyor drive shaft is keeps on breaking on the middle. Drive shaft with two gearbox attach to both end of shaft. 25hp motors with speed set to 30 but gear box speed is at 6. Shaft keeps on breaking on the center. Any ideas why? Is it possible that your shaft is a rigid shaft supported by more than two bearings so that small misalignment causes fluctuating stress in the shaft, leading to fatigue failure? Quote Link to comment Share on other sites More sharing options...
0 Sarah W Posted August 3, 2021 Report Share Posted August 3, 2021 On 4/17/2021 at 3:23 AM, J.R said: My conveyor drive shaft is keeps on breaking on the middle. Drive shaft with two gearbox attach to both end of shaft. 25hp motors with speed set to 30 but gear box speed is at 6. Shaft keeps on breaking on the center. Any ideas why? Hi did you solve this problem? do you have any other drive details? 3 minutes ago, Sarah Walmsley said: Hi did you solve this problem? do you have any other drive details? Do you any images, if it is caused by vibration or misalignment do you have a coupling between the shafts? https://bit.ly/PumpVibrationEliminated 3 minutes ago, Sarah Walmsley said: Quote Link to comment Share on other sites More sharing options...
0 DrD Posted August 21, 2021 Report Share Posted August 21, 2021 Without knowing the shaft dimensions, support geometry, shaft material, etc., there is very little that any reader can say other than to guess at your problem. It would help a lot if you would post proper drawing for the shaft and the entire system. DrD Quote Link to comment Share on other sites More sharing options...
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J.R
My conveyor drive shaft is keeps on breaking on the middle.
Drive shaft with two gearbox attach to both end of shaft. 25hp motors with speed set to 30 but gear box speed is at 6. Shaft keeps on breaking on the center.
Any ideas why?
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