633
ENDURANCE OF ROTATING SHAFTS.
Endurance of Rotating Shafts.
Gautire steel.
Marks, 1C¡¡.
Turned down from rod 1J" diameter, 0.16 per cent carbon. Diameter, 1"; speed of rotation, 500 per minute.
Length between end bearings, 33".
Loaded over 4" length at middle.
Deflections measured on chord of 10".
Maximum fiber stress per square inch.	Number of rotations.		Micrometer readings for deflections.				De- flec- tions.	Sets.	Remarks.
	Succes- sive.	Total.	On line.	Un- load- ed.	Load- ed.	Un- load- ed.			
Pounds.				Inch.	Inch.	Inch.	Inch.	Inch.	
40,000	0	0	a	.1262	.0940	.1261	.0321	.0001	
			b	.1263	.0943	. 1262	.0319	.0001	
				.1265	.0945	.1264	.0319	.0001	
	1,000	1,000	a	.1261	. 0935	.1259	.0324	.0002	
			b	. 1265	.0936	. 1257	. 0321	.0008	
				.1265	.0938	.1262	.0324		
	9,000	10,000	a	. 1252	.0917	.1249	.0332	.0003	
			b	.1260	. 0921	.1248	.0327	.0012	
				.1278	.0914	.1250	.0336	.0028	
		160,900							Rested 16 hours.
	150,900	160,900	a	. 1220	.0895	.1222	.0327	-.0002	
			b	.1313	. 0963	. 1289	. 0326	.0024	
				.1265	.0937	. 1257	.0320	.0008	
		362,100							
	201,200	362; 100	a	.1306	.0956	.1280	.0324	.0026	
			b	. 1215	.0878	.1207	. 0329	.0008	
				. 1290	.0955	.1270	.0315	.0020	
	112,200	474,300							
									north of south mid-
									die bearing.