Disassembling the ball screw on the W axis

2) Removing the timing belt

Loosen the bolts on the W-axis servo motor bracket slightly to loose the tension belt. Then, loosen and remove the timing pulley in the ball screw side.

3) Before you can remove the bearing from the bearing support, the hydraulic line for the W-axis clamping device should be disconnected beforehand so that you can turn the ball screw smoothly.

4) Removing the timing pulley

Loosen the bolts on B10121184 span ring flange and loosen and remove B14120173 timing pulley from the ball screw. You should remember the original position of the span ring for re-installation.

▪ 6-BB8×25

Timing Belt

Tension Bolt

W-axis Clamp Hydraulic Line

Timing Pulley

Span Ring Flange Timing

Pulley

5) Loosen the bolts on B14120213 bearing cap before removing it.

▪ 6-BB8×25

6) Turn the ball screw manually to pull out the bearing assembly from the housing. Loosen the lock nut set-screw and remove R03263 lock nut, B14120244 collar, B14120254 collar and R10024 angular bearing.

7) Remove B1420223B lock nut, B14120524 collar and S6003280 ball bearing (located in the bearing support side) from the ball screw.

Bearing Cap Bearing

Cap

Lock Nut Collar

Angular Bearing Collar Lock Nut

Collar Angular

Bearing

Collar Ball Screw

Bearing

Support Lock Nut

Ball Bearing

Collar Bearing

Support Lock

Nut

Ball Bearing

Collar

Ball Screw

8) Mark the position of B14120033B bearing support and loosen the bolts before removing it.

▪ 4-BB20×60

9) To facilitate the work on the ball screw, remove the covers and disconnect the hoses. Loosen the ball nut as well as the bolts on

B14120021C bearing housing before removing the ball screw.

▪ 6-BB10×40

Bearing Support

Ball Screw Nut

1.9 Disassembling the ball screw on the W axis 1) Fitting the bearing cap on site

① Measure the outer race of each bearing of R10024 angular bearing set. (“A”)

② Use the depth gauge to measure the depth between B14120033B bearing support and angular bearing installation section. (“B”)

③ Calculate the target size of the bearing cap before fitting it on-site. (“C”)

※ Sectional target size of the bearing cap:

“C” = (“B - A”) + 0.03mm

2) Installing the ball screw temporarily

Insert the ball screw into B14120021C bearing housing with care and tighten the bolts (for fixing between ball nut and bearing housing) loosely to attach the ball screw to the bearing housing.

▪ 6-BB10×40

※ Do not fix the ball screw because you should adjust the parallelism of the ball screw.

Angular Bearing

“A”

Bearing Support

Ball Screw Nut Bearing

Cap

“B”

Fitting Side of Bearing Cap

Micrometer

Bearing Support

Bearing

“B-A” Cap

“C”

3) Installing the ball bearing

Install S6003280 ball bearing, B14120524 collar, B1420223B lock nut (all of which will be installed in the bearing support side) into the ball screw in sequence. Lock the lock nut using the chisel and hammer and tighten the set screw to fix the lock nut.

4) Installing the bearing support temporarily Based on the marking line, tighten

B14120033B bearing support bolts loosely so that you can adjust the position of the support.

▪ 4-BB20×60

5) Installing the angular ball bearing

Install B14120254 collar, R10024 angular bearing, B14120244 collar and R03263 lock nut (all of which will be installed in the bearing housing side) into the ball screw in

sequence. Lock the lock nut using the chisel and hammer and tighten the set screw to fix the lock nut.

6) Installing the bearing cap

To ensure that the bearing contacts on the bearing support, turn the ball screw manually so that the bearing fits into the bearing support hole. Then, install the completed

B14120213 bearing cap into the bearing support.

▪ 6-BB8×25

7) Positioning and fixing the bearing support

Use the positioning pins for B14120033B bearing support to adjust the horizontal and vertical position of the ball screw so that it aligns properly. Then, tighten up the bolts.

※ Target: below 0.01mm

8) Positioning and fixing the ball screw nut

Use the indicator to measure the height of the ball screw in the bearing support side as well as the height in the ball nut side. Adjust the position of the ball screw nut until two measurements becomes the same. Then, tighten up the bolts on the ball nut.

※ Target: below 0.01mm

Bearing Cap Bearing Cap

Bearing Housing

Height Difference: below 0.01mm Ball Screw Nut Bearing

Support Bearing Support

Adjust in four directions Height Difference: below 0.01mm

Ball Screw

9) Installing the timing pulley

Install B14120173 timing pulley, R08010 span ring and B10121184 span ring flange into the ball screw in sequence. Present the indicator needle to the timing pulley and adjust the runout to below 0.02mm. Then, tighten the bolts.

▪ 6-BB8×25

10) Installing the timing belt

Fit the timing belt into the timing pulley and use the tension bolt to tighten the timing belt.

Then, tighten up the bolts on the W-axis servo motor bracket.

▪ When the ball screw is installed completely, turn the ball screw manually to check if it's installed properly.

11) Installing the W-axis clamping hydraulic line Connect the W-axis clamping hydraulic line back to the original.

12) Finishing

Install the removed covers and hoses back to the original and use the grease gun to inject grease in the grease nipple as appropriate, which is installed on the ball nut.

Timing Belt

Tension Bolt

Grease Injector

Nipple Indicator

Runout: below 0.02mm Timing

Pulley

W-axis Hydraulic Line

2. Assembling/disassembling the table

13 ^R83237 Rotary Encoder 1st R00250-18000-CABL Heidenhain

14 ^{R833238 EXE Unit} 1st EXE 602E(5-Fold) Heidenhain

15 ^R83239 Extension Cable(20M) 1st 309 774 20 Heidenhain 16 R83240 Cable/One Connector 1st 309 777 03 Heidenhain

18 B14321043B Flange 1 SM45C