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    Spindle wobble on Hurco KMB-1S

    Based on the measurements I've taken, its my opinion the shaft is not bent, but the taper is somehow off center. How the taper could become off center is beyond me?? >> If you want to send it in I can measure it all up, and quote what is the best course of action. Wow! Those are exactly...
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    Spindle wobble on Hurco KMB-1S

    Its actually a KMB-1m, although some of the documentation I have for it says KMB-1S. See attached pics. I've upgraded the control with RaspberryPi/LinuxCNC/MESA so that's why the control panel looks different in the frontal pic.
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    Spindle wobble on Hurco KMB-1S

    Thanks for the response mottrhed. Don't really understand your comments. Its maybe not clear from the photo, but there is a single vblock about 4 inches wide with two clamps. It pretty much fully contacts the primary bearing journal which is also about 4 inches wide. There is nothing that...
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    Spindle wobble on Hurco KMB-1S

    Finally got around to trying the vblock technique. See photo attached. My vblocks have these clamps to hold material in place. The screws are conveniently brass tipped. In order to validate my approach I put the indicator on the barrel turning in the vblock. I have only a 0.0005...
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    Spindle wobble on Hurco KMB-1S

    Was figuring I could null out a lathe's imperfections. I'll give vblock technique a try. One problem is the shaft is long and will be cantilevered off the end of the vblock. For an accurate measurement, it is essential that the shaft is consistently in full contact with the vblock. We'll...
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    Spindle wobble on Hurco KMB-1S

    Have completely disassembled the spindle now. Looking to get access to a lathe to measure runout. In the meantime, I'll probably need new spindle bearings. The dual radial bearings are New Departure 20207 and the thrust bearing is Fafnir 206PP. New Departure is no longer around. Fafnir...
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    Spindle wobble on Hurco KMB-1S

    Thanks for the tips Dan. I made several measurements. The first one pictured below (practical machinist won't let me upload the movie:angry:) shows the indicator riding _on_ the taper. This gives me a runout of about 0.001. I also mounted a long tool in a tool holder, and carefully...
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    Spindle wobble on Hurco KMB-1S

    40+ year old Hurco/Kondia KMB-1S exhibits rather noticeable spindle wobble. Assumed it was bearings. If I indicate on the inside of the taper and grab the Qwik Switch lock ring, I might be able to get 0.001 deflection. Not great, but even worse... If I simply indicate the taper and spin...
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