{"id":653,"date":"2017-04-21T14:44:30","date_gmt":"2017-04-21T14:44:30","guid":{"rendered":"https:\/\/hstspindles.com\/index.php\/portfolio\/miyano\/"},"modified":"2023-11-02T15:40:44","modified_gmt":"2023-11-02T15:40:44","slug":"miyano","status":"publish","type":"portfolio","link":"https:\/\/hstspindles.com\/portfolio\/miyano\/","title":{"rendered":"Miyano"},"content":{"rendered":"
Since its inception in the 1920\u2019s, Miyano<\/em> has been well known for their CNC automatic lathes. Recently purchased by Citizen Machinery Co., Miyano is still well respected in the industry. Being in the spindle repair business for the past 30 Years, High Speed Technologies knows Miyano spindle Repairs and Rebuilds. We have the experience to fix your spindle and the test equipment to make sure it\u2019s done right the first time. All of our Miyano spindle repairs come with a one-year warranty. Call today for your Miyano spindle repair questions 1-603-483-0333.<\/p>\n When our customer, a small machine shop on the east coast, sent us their Miyano BND34S3 CNC Lathe spindle it was in very poor condition. The customer\u2019s complaint was \u201cNot holding tolerance. Bad finish. Noisy but seems to spin too freely.\u201d<\/em> Being a small machine shop, this one spindle failure was very painful to our customer. So we made their spindle repair a priority and moved quickly.<\/p>\n <\/p>\n After disassembling the spindle, a couple of things stood out right away. The #1 bearing had been spinning freely on the shaft for some time. This damaged both the bearing and the shaft. The shaft journal now measuring -59 microns undersized required G-P-G<\/a>. This acronym stands for Grind-Plate-Grind<\/em>. This is our process for restoring damaged tapers or bearing journals on a spindle shaft or housing bore. \u00a0The shafts front shoulder was also damaged and required a Kiss Grind<\/a> only. Also referred to as a \u201cbreeze grind\u201d or a \u201cdust grind\u201d this is a light surface grind that will remove minor surface damage or excessive runout.<\/p>\n Also, severe fretting was observed on the entire bearing stack. This was a clear indication of significant vibration and some contamination. This excessive vibration is what lead to the customers \u201cbad finish.\u201d On the plus side, both the main pulley and timing pulling were verified in good condition!<\/p>\n <\/p>\n