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Fan Shaft Braking Device
automatic 2 Typical shaft speed is 286 RPM at 167 Hp. The plates weigh about 30 lbs. total, and then an 8" Shaft Extension which sits inside the bore of the Braking Device. Prototype has already been built and tested yet my question is still about the effect of drilling (Metallurgy) at the...- coss
- Post #3
- Forum: Mechanical engineering general discussion
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Fan Shaft Braking Device
This design involves adding Differential Holdback Band Brakes on 4" Steel SAE 1040 Shafts in which three high-strength A490 bolts will be used to attach a 3/4" thick, 8" Diameter steel plate to the non-drive side of the shafts instead of a coupling because only about 1/4" of...- coss
- Thread
- Replies: 0
- Forum: Metal and Metallurgy engineering
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Fan Shaft Braking Device
This design involves adding Differential Holdback Band Brakes on 4" Steel SAE 1040 Shafts in which three high-strength A490 bolts will be used to attach a 3/4" thick, 8" Diameter steel plate to the non-drive side of the shafts instead of a coupling because only about 1/4" of...- coss
- Thread
- Replies: 4
- Forum: Mechanical engineering general discussion
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Steel Shaft Design Safety Factors
beloka, strokersix, and macmil I must say you all give great advice. The decision has been been made to replace the five damaged shafts with new ones as the method I first described is considered ill-advised. It seems that the two welds 180 degrees apart introduce a new alternating stress which...- coss
- Post #10
- Forum: Mechanical engineering general discussion
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Steel Shaft Design Safety Factors
Chicopee Yes the shaft was damaged by bearing failure. The sheave is overhung by about 16" and the fan wheel is about 60" from the drive bearing. Loads from rotating belts and sheave weight give a resultant force on sheave of about 2,250 lb. The factor of safety you suggested of at...- coss
- Post #5
- Forum: Mechanical engineering general discussion
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Steel Shaft Design Safety Factors
Would like advice on reasonable value for Factor of Safety on a 15' long Steel SAE 1040 Fan Shaft on a 200,000 CFM Fan with a 250 hp Motor driven by a VFD. Fan Sheave is 1,000 lb. ,10 V-belt , 40" Diameter, and the Wheel is 7,000 lb. , 89" Diameter. Shaft is 35 years old and was...- coss
- Thread
- Replies: 9
- Forum: Mechanical engineering general discussion
