ABEC 7<\/a>\u00a0super-precision spindle bearings. Usually these spindles use a hybrid ceramic set of bearings due to their higher operating speeds. Your spindle repair will minimally include replacing all seals, grinding bearing spacers for proper preload and restoration of damaged shaft surfaces. Then we perform high-speed balancing to eliminate vibration, extend spindle life and improve finish quality on parts. HST has provided the CNC machining community with a high-quality alternative to higher-priced OEM spindle repairs since 1986.<\/p>\nSeiko Seiki MH15 Job I2609:<\/strong><\/p>\n<\/p>\n
Seiko Seiki MH15 Spindle after repair<\/p>\n<\/div>\n
When we received this Seiko Seiki MH15 spindle from a world-class, automotive powertrain manufacturer out of New York, they made sure to mention that it only lasted five days in operation after being repaired by another spindle repair house.<\/p>\n
Upon disassembly we literally put the bearings under a microscope. Under magnification the #1 bearing showed evidence of a misalignment. As you can see in the pictures below, there was a narrow ball path on one side of the race and a much wider band 180\u00b0 from it.<\/p>\n
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Seiko Seiki MH15 Spindle #1 bearing failure<\/p>\n<\/div>\n
This misalignment could have been caused by a couple of different things. But we narrowed the cause of the problem down to the front housing. Carefully mounting the front housing bore on our universal grinder we were able to determine that the housings bearing shoulder was .0008\u201d out of square resulting in the misalignment we observed. A quick kiss grind squared up the shoulder and eliminated the cause of the misalignment.<\/p>\n
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Housing bearing shoulder before grind<\/p>\n<\/div>\n
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Housing bearing shoulder after grind<\/p>\n<\/div>\n
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After correcting the housing shoulder, cleaning and inspecting all of the components and replacing all of the bearings and seals with new, the spindle was ready to be put back together. This particular model of Seiko Seiki spindle operates up to 150,000 RPM! So testing was very careful and slow. After minimal trim balancing, the spindle ran extremely well. No more misalignment.<\/p>\n
The customer was very pleased to have their spindle back and working properly. They had great things to say, \u201cVery helpful and professional. Took the time to educate us on what we needed to know to make an informed decision concerning spindle repairs. Kept us updated and informed during every step of the process.\u201d<\/em><\/p>\n
\nSeiko Seiki MH15 Job I2629: <\/strong><\/p>\nLike the previous mentioned spindle, this Seiko Seiki MH15 also arrived to us due to the lack of adequate repair from another spindle repair shop. Unfortunately, because it had already been sent to another spindle repair shop, it arrived to us in pieces. We therefore could not conclusively diagnose the cause of failure. However, the bearings did show damage that is indicative of overload.<\/p>\n
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Stator passed all testing<\/p>\n<\/div>\n
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Spindle arrived disassembled<\/p>\n<\/div>\n
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After testing the stator and inspecting the critical dimensions on the shaft and housing we were ready to install the new hybrid ceramic bearings and reassemble. Because of the higher RPM we had to proceed methodically and with caution. Before it was test run we had to verify that the shafts pilot ID and face measured 1 micron or below, which it did. This spindle passed all final test criteria and ran like new!<\/p>\n
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Seiko Seiki safely packed and ready to ship!<\/p>\n<\/div>\n
The customer was so pleased with the repair that they told us they\u2019d be back! \u201cI appreciate everything you all did, and I know I\u2019ll be calling you again for more work. Also, please extend a thank you to Briah on my behalf. She was excellent to work with. She prioritized my job and followed through with utmost urgency. \u201c<\/em><\/p>\n
\nSeiko Ltd. M8-T Job I0680:<\/strong><\/p>\n