Emergency OKK VP400 Taper Grind

A new customer in Virginia called for a quote to come grind their OKK spindle taper. I was told it was crashed hard and they are in the middle of a job, can we get there ASAP to get their machine back to making good parts.

We arrived the next day. As you can see from the picture above "hard crash" may have been putting it mildly.

First thing we did - We hooked up our vibration analyzer to make sure the bearings were still okay, to our amazement they were still in great shape.

Second thing we did - We informed the customer that we can fix the run-out, however we can't guarantee that because of the condition of this spindle taper that it will be a permanent fix and as soon as this job is complete the spindle should be pulled and sent out for repair.

Before Taper Grind

• Run-out at taper = 75 microns
• Run-out at 300 mm test-bar = 200 microns
• Taper Contact = 15%
• Draw-bar retention force = 1,940 lbs

After Taper Grind

• Run-out at taper = 0 microns
• Run-out at 300 mm test-bar = 8 microns
• Taper contact = 70%
• Draw-bar retention force = 1,940 lbs

Conclusion

We are miracle workers and you should call us when you crash your machine, spin a tool or have run-out that you want cleaned up. Seriously, you should call now.

Phone number - 1.866.868.6761

Website - www.gunnexllc.com