How to keep your CNC machinery pit stops short

Efficient manufacturing of today almost always depend on a minimum of downtime. Therefore a spindle crash of course is a most unwelcome accident. The good thing is that there now are fast methods for checking the machine.

One of the most common things that causes a need for service is spindle crash. And of course this always happens when you really need maximum machine availability! Therefore you obviously want the geometry check of the machine to be as quick as possible. Most technicians would be thrilled to use the Easy-Laser® E940 system for measurement and alignment of the spindle, turret and tailstock back to precise position, because it is so quick to set up on the machine and to use. Here’s how to do:

First check the straightness

At first we start to check the straightness of the Z-axis both for tailstock movement and for the turret. Mount the laser transmitter (EHS-unit or D22) in the main spindle and the EHM-unit at the moving part.

1. Tailstock Z movement is measured in both horizontal (H) and vertical (V) direction at the same time.
2. Turret movement Z2 is measured.

If the above measurement is within tolerance, normally 5-10 microns, we can go on with the next measurement.

Next step, spindle bearing check

After a crash you want to know the condition of the spindle bearing. Are the bearings still ok, or should they be changed? The E940 includes a vibrometer and software to listen to the bearing following an ISO-standard presentation/documentation, to give you the answer how to proceed with the job.

Spindle direction

1. Main spindle to Z-axis (tailstock movement) – analyze the result, which should be within 0.015mm/300mm according to the ISO-standard given from the display unit. 
2. Carry on with the main spindle to turret movement.

Main spindle

Main spindle to tailstock measurement is done by using the EHS-unit and EHM-unit.

Main spindle to turret check is normally done by using D22 laser transmitter in the main spindle and EHM-unit at the turret, see below picture.

Start manufacturing again

In a few hours all measurements and necessary alignment has been performed with full documentation according to ISO-standard. Hopefully no severe damage was found, and production can start immediately. The machine is back on track, and so are you!

Eilif Johansen
Product Manager Machine Tools

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