Yamaha 4-axis model, 3-axis model Recommended tension meter U-505 Unitta, Measurement method

Chapter 11 FXYBX/SXYBX

5)Move the slider by hand so that the distance between the slider end face and base block end face is 150mm. Apply a load at the L = 115mm position from the base block end for the FXYBX X-axis, at L = 65mm for the FXYBX Y-axis, and L = 129mm for the SXYBX X and Y axes.

150mm150mm

L

6)Temporarily tighten the belt stay installation bolt. If the deflection is within the range shown in Table 11-1 when the belt is pressed with the designated load, the tension is appropriate. If the deflection is not within the range of Table 11-1, repeat steps 4) and 5) to adjust the tension.

Table 11-1 Drive belt load and deflection

Model	Load (N)	Load (kgf)	Deflection(mm)
FXYBX X-axis	4.9 to 5.9	0.5 to 0.6	2
FXYBX Y-axis	5.9 to 6.9	0.6 to 0.7	2
SXYBX X-axis, Y-axis	5.9 to 6.9	0.6 to 0.7	2

7)Tighten the belt stay installation bolt, and remove the belt tension adjustment bolt.

8)Refer to “Chapter 11 6. Installing the Cover”, and install the upper cover. Finally, install the end cover.

Reference

(Adjusting the drive belt tension with a tension meter)

Use of a belt tension gauge is recommended to obtain more accurate measure- ments.

Recommended tension meter U-505 (UNITTA)

Measurement method

In step 5) of the adjustment of the drive belt tension, pull the belt at the position where the load is applied, and adjust to the following values.

Refer to the instruction manual enclosed with each measuring instrument for details on using the belt tension gauge.

Model	Tension	Frequency	Span length	Belt width	Unit weight
	(N)	(Hz)	(mm)	(mm)	(g/mm width⋅m length)
FXYBX X-axis	127 to 147	86 to 93	230	20	4.0
FXYBX Y-axis	127 to 147	117 to 126	170	20	4.0
SXYBX X-axis, Y-axis	169 to 188	79 to 84	258	25	4.0

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