Rolled Ball Screws, Shaft Dia.50 Lead 10/20/50 Precision Grade C7

■Support side

Alterations	Code	Spec.
① No Machining on Support Side Shaft End	NC	No machining added on the support side shaft end. Specifying Sample NC
② Ball Nut Orientation Reversed	RLC	Changes the nut direction. Specifying Sample RLC
③ No machining of the support side shaft-end retaining ring grooves	RNC	No machining of the support side shaft-end retaining ring grooves. Specifying Sample RNC
④ Change the length of the support side shaft end	FC	Change the length of the support side shaft end. 23≤FC≤90 FC=1mm increments Ordering Code FC30
⑤Change the machining content of the support side	GC	Change the machining content of the support side. 5≤G≤90 Choose Q from 15, 20, 25, 30 and 40 G＝1mm increments Ordering Code GC－Q25－G30

Only one of ①, ③, ④ and ⑤ can be selected.
Only one of ⑦, ⑧ and ⑨ can be selected.
Only one of ⑩ and ⑪ can be selected.
When ⑫ and ⑬ are specified simultaneously, no male thread will be machined regardless of the value specified for U in ⑫.
When specifying any alteration, the nut motion range (Y dimension) may become shorter. Please make sure that the nut motion range is greater than the full length of the nut.

■Fixed side

Alterations	Code	Spec.
⑥ Machining fixed side wrench slots	SZC	Adds wrench flats on the fixed side shaft end. Specifying Sample SZC Move the nut to the wrench slot, otherwise the ball will fall off. The nut may not be moved within the Incomplete Hardened Area. Note that when selecting.
⑦ Machining fixed side shaft end keyways	KC	Adds a keyway on the fixed side shaft end. When specified simultaneously with 5≤KC≤49 and ⑪, 5≤KC≤F－1 KC=1mm increments Ordering Code KC10
⑧ Machining fixed side shaft end keyways	KLC	The machining position of keyways at fixed side shaft end can be specified. (Keyway size is the same as KC.) When specified simultaneously with 5≤K≤48　K＋S≤49 and ⑪, 5≤K≤89         K＋S≤F－1 K, S＝1mm increments Ordering Code KLC－K5－S3
⑨ Machining fixed side shaft end plane	SC	Adds a flat on the fixed side shaft end. When specified simultaneously with 5≤SC≤49 and ⑪, 5≤SC≤F－1 SC=1mm increments Ordering Code SC10
⑩ No machining of small steps on the fixed side	NF	No machining of small steps on the fixed side Ordering Code NF
⑪ Change dimensions of small steps on the fixed side	FP	Change dimensions of small steps on the fixed side 50≤F≤90　20≤P≤35 F, P＝1mm increments Ordering Code FP－F60－P25
⑫ Change dimensions of big steps on the fixed side	EU	Change dimensions of big steps on the fixed side 16≤E≤200　16≤U≤E－3 E, U＝1mm increments Ordering Code EU－E100－U30
⑬No machining of big steps male thread on the fixed side	NU	No machining of big steps male thread on the fixed side Ordering Code NU

 

■ Selection and Precautions for Use
● The noise value of the screw after assembly is not guaranteed.
● Although lithium soap-based grease has been applied at the factory, it is required to apply new grease every 2~3 months as standard after receiving the goods, otherwise the normal use will be affected.
●In operation, if there is too much noise or sharp and harsh sound, please make sure that the installation accuracy of the screw and the specifications of peripheral components such as motors and couplings are appropriate.
●Do not let the nut exceed the movement range of the ball screw nut, or screw out of the screw shaft, otherwise the ball will fall off and the ball cycling parts will be damaged.
● Ball screws and nuts placed with an inclination may fall due to weight. Please be careful.
● This product is a machined type, so there will be knife patterns and color difference in its appearance. Small scratches or color changes without affecting the use and main function are of a normal phenomenon. Please feel free to use.

■ Precautions of the ball screw and peripheral parts design and assembly
The ball screw is a component that only bears axial load. If it is subjected to radial load or moment load, poor sliding, vibration or abnormal noise may occur, shortening its service life. The reason that the ball screw bears radial load and moment load is the axis deviation and parallelism error of the surrounding parts. Therefore, it is necessary to correctly design and assemble the peripheral parts of the ball screw to prevent errors.
● Axis deviation of ball screw and support unit (Fig. 1)
- Axis deviation is the deviation of the ball screw fixed by the fixed side support unit and the bearing of the supporting side support unit.
-The allowable value of the axis deviation is 20μ or less (reference value)
●Parallelism between ball screw and linear guide (Diagram 2)
- Parallelism error refers to the inclination of the ball screw in the up-down or left-right direction with respect to the reference of the linear guide.
-The allowable value of inclination is below 1/2000 (Diagram 3)
●Precautions of assembly
If you notice abnormal noises during the operation of the ball screw or jamming during movement after assembly, please loosen the connections of the parts before proceeding. Adjust and reassemble after moving smoothly.
- Error in the left and right direction of the support unit (Fig. 1)
- Parallel error of linear guide and ball screw (Fig. 2)
- Fixing of workbench and nut bracket
- Fixing of ball screw nut and nut bracket