Due to the changes with Hitachi Seiki, we have customers that are experiencing some difficulty getting support for their machines. Northland Tool & Electronics has geared up to make sure owners of Hitachi Seiki machines will not have issues when it comes to Hitachi Seiki spindle repair.
We have been supporting Hitachi Seiki spindles since the beginning (over 30 years!) and we have amassed prints, parts and the knowledge to repair most types of Hitachi Seiki spindles. This allows us to guarantee quick turn around on the spindle repair to make sure you are up and running in the shortest time period possible.
Hitachi Seiki HT - 20R CNC Turning centre with Multi Control.
10 Station turret
Programmable tailstock
8 inch chuck
51mm spindle bore
Turning capacity
220mm x 600mm long.
Hatec magazine barfeed, parts catcher and swarf conveyor.
Hitachi Seiki HT - 23RIII Spindle Repair
CNC Turning centre with Multi Control. 10 Station turret
Programmable tailstock
10 inch chuck
71mm spindle bore.
Turning capacity
320mm x 600mm long
Swarf conveyor.
Hitachi Seiki - TF20 CNC Turning centre with Seicos L111 Control.
10 Station turret
8 inch chuck.
Turning capacity
220mm x 200 long.
MR6 Machine Mounted Robot with 14 pallet loader complete with turnover table.
Hitachi Seiki VM40
Common Problems With Hitachi Seiki Spindles
Rotary Union Failure
One of the most common causes of failure on Hitachi Seiki spindles is worn rotary union parts. This causes the through tool coolant to leak from its passageway and it often time finds its way to the interior of the Hitachi Seiki spindle. This causes bearing failure and stator damage. It is not uncommon that failures due to rotary union failure involve a stator rewind and grind plate grind to the bearing journal.
To avoid this failure replace the worn rotary union parts during every spindle change. You also want to make sure the pressure in your rotary union system is up to specification. Reduced pressure can cause leakage, as the two mating parts of the rotary union will not be forced together enough to prevent leakage.
Stator Damage
As coolant enters the stator section of the spindle it starts to break down the insulation of the stator wires. Eventually this causes a short to ground or short leg to leg in the stator. This will cause an error in the machine causing it to shut down.
Spacer Damage From Loss of Preload
Spacer damage can occur if bearing preload is lost or if the spindle is run after bearing damage has occurred. Depending on the severity of the damage the repair of the spacer can range from rework to manufacture of replacement parts.
Shaft Fretting
When two mating parts, in this case the spindle shaft and pulley, are not within specification fretting will occur. The evidence of this is the brown almost rust colored discoloration. This area of the shaft was worn down from the micro machining that occurs when the two parts are allowed to move against each other. The shaft in this particular spindle repair was undersized and needed to be ground plate ground to bring it back to OEM tolerance.
Need Your Hitachi Seiki Spindle Repaired? Get a Quote Below
Rotary Union Failure
