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We provide onsite support to our customers - any machine tool, any age

Experience in all CNC manufacturing industry fields, including automotive, aerospace, textiles, food & beverage, petrochemicals, R&D, science & education

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20th December 2023 to 3rd January 2023

Blog Post

5th August 2020

Collapsed Bearings on Bridgeport VMC800


The X axis was immediately tripping out on this 1998 Bridgeport VMC800 when trying to reference we were called in as the customer suspected the faults were caused by a faulty servo drive or servo motor.

The motor passed the insulation and balance tests and the servo drive passed the diode check, so we had to dig deeper.

The next stage was to remove the motor and try and jog the axis. The motor moved freely, but the ballscrew was locked solid.

On closer inspection, we found the bearings had collapsed. New bearings were ordered and this 22 year old machine will live to see another day.

Quite often, faults can be deceptive. It initially appeared that the root cause was an electrical issue, but a few simple tests uncovered a mechanical failure causing the servo drive & motor to overload.

Please contact Control CNC using the red buttons at the top of this page if you think we would be able to help with your machine. We cover the whole of the UK and Ireland. We can help you book a service, get a quote for a repair, or help you purchase the best quality parts for your business.

Bridgeport VMC900
Bridgeport VMC900
Bridgeport VMC900
collapsed bearings
Simodrive E/R Module

Previous Post

23rd July 2020

A common failure on Siemens and Heidenhain-controlled CNC machines such as XYZ, Hardinge, Bridgeport, Breton and Dugard is E/R module failure.

Over time, the internal fans stop working and coolant and contaminant ingress occurs. The most common failure type we see is the 16/21 KW (6SN1145-1BA01-0BA1(2/0).

You Tube Video Still XYZ TC250 with noisy spindle

Next Post

20th August 2020

YOU TUBE VIDEO - This is an XYZ TC250 with a noisy spindle, finally after 14 years of turning the same job day in and day out the bearings have finally dried up and worn out!

The spindle was removed and sent off for a refurb, which we will then refit and setup once rebuilt.


A family business established in 2016, Control CNC Services Ltd. has over 30 years of experience in the CNC machine tool industry. 

Our engineers support all aspects of CNC applications. We provide a total breakdown solutions package; whether the fault is mechanical, electrical, electronic, software, control, or drive, our multi-disciplined engineers will resolve the problem.

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33 Holman Street, Kidderminster, DY11 6QY

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