Yamaha 4-axis model owner manual Adjusting the R-axis belt tension ZRS, Adjusting the belt tension

Chapter 8 SXYX

5-3-2 Adjusting the R-axis belt tension (ZRS)

With the ZRS model, a timing belt is used for the R-axis.

If the timing belt tension is week, adjust the belt tension with the following pro- cedures.

WARNING

There is a risk of injury if fingers, etc., are caught between the drive sec- tion pulley and belt section. Always turn the controller power OFF and carefully carry out the work if these parts may be contacted.

!CAUTION

The position will deviate when the belt tension is adjusted.

Carry out absolute reset, and reset the basic coordinates and point data.

Push-pull scale

Deflection

Load

Pulley Belt Pulley

Fig. 8-27 Adjusting the belt tension

1)Turn the controller power OFF.

2)Place a sign indicating "Work In Progress" so that other operators do not turn the controller power ON.

3)Remove the cover. (M4, 6 screws)

4)The following work must be carried out by two operators.

One operator must apply a vertical load on the center of the belt with the push-pull scale, and the other operator must measure the belt deflection at that time.

5)If the measured value is within the range shown below, there is no need for adjustment. Adjust with the following procedure if the measured value is not

within the range.

	Table 8-1
Load		4.4 to 4.8N ( 0.45 to 0.49kgf )
Deflection amount		2mm

6) Loosen the M4 bolt q (three positions) shown in Fig. 8-28.

8-30