How to set the high and low gears on Fanuc CNC

Related parameters:

3705#2: Gear switching method

3732: Spindle motor speed at spindle gear displacement

3735: Minimum clamping speed of spindle motor

3736: Maximum clamp speed of spindle motor

3741: Maximum spindle speed corresponding to gear 1

3742: Maximum spindle speed corresponding to gear 2

3751: Spindle motor speed at the switching point of gear 1 - gear 2

3752: Spindle motor speed at the switching point of Gear 2 - Gear 3

4056-4059: Gear ratio data between spindle and motor

4171-4174: Gear ratio data between motor sensor and spindle

 

Example 1: ZF gear ratio 1:1 in high gear, 4:1 in low gear, required shift speed 800, maximum spindle motor speed 7000

Solve the problem:

Parameter 3705 #2 = 1

Parameter 3732 set 3

Parameter 3735 set 5

Parameter 3736=4095

Parameter 3741=7000/4=1750

Parameter 3742=7000

Parameter 3751=[800(shift speed) X 4095(parameter 3752)]/[1750(parameter 3741)]=1872

Parameter 3752=4095

Parameters 4056-4059 are set to 100, 100, 100, 400, respectively.

Parameters 4171-4174 are set to 1, 1, 4, 1, respectively.



Example 2, ordinary hydraulic high and low gear high-grade high-grade ratio of 1: 0.875, low-grade ratio of 1: 0.230263, the requirements of the shift speed of 1000, the maximum speed of the spindle motor 7000

Solve the problem:

High-grade ratio 1:0.875 = 8/7 = 114/100,Low-grade ratio 1:0.230263 = 434/100/ = 5472/1260

Parameter 3705#2=1

Parameter 3732 set to 3

Parameter 3735 set 5

Parameter 3736=4095

Parameter 3741=7000/4.342=1612

Parameter 3742=7000X(7/8)(high gear ratio)=6125

Parameter 3751=[1000(shift speed)X4095(parameter 3752)/1612(parameter 3741)]=2540

Parameter 3752=4095

Parameters 4056-4059 are set to 114, 100, 434, 100, respectively.

Parameters 4171-4174 are set 8, 7, 5472, 1260, respectively. 



Example 3, ordinary hydraulic high and low gear high-grade high-grade ratio of 1:1.357, low ratio of 4.873:1 requirements for the shift speed of 1000, the maximum speed of the spindle motor 8000, the maximum speed of the spindle 4500

Parameter 3705#2=1

Parameter 3732 set to 3

Parameter 3735 set to 5

Parameter 3736=4095

Parameter 3741=[Parameter 3742(6106)]/4.873=1253

Parameter 3742=4500X1.357 (high grade ratio)=6106 is less than 8000

Parameter 3751=[1000(shift speed)X4095(parameter 3752)]/[1253(parameter 3741)]=3268

Parameter 3752=4095

Parameters 4056-4059 are set to 1000, 1357, 1000, 4873, respectively.

Parameters 4171-4174 are set to 1357, 1000, 4873, 1000, respectively.