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Author Topic: Ultramittent bearing upgrade Randy Bowden Expert Film Handler Posts: 146 From: Portland, OR, USA Registered: Aug 2000 posted 10-24-2007 11:41 AM                     Here is my upgrade for the horrible outboard bearing design on the Christie Ultramittent. One of the most common reasons for failure on this intermittent is due to the fact that the inner bearing race will slip against the starwheel shaft, resulting in the bearing wearing a groove into the shaft, I see this a lot in my shop, sometimes it's very extreme. This doesn't come as much of a surprise considering that the surface contact area for the bearing only measures aprox. 3mm wide, my upgrade takes it to aprox 9-10mm wide. I marked with a sharpie pen on two separate starwheels to illustrate the difference. I've done hundreds of rebuilds like this and have yet to have one come back with any apparent wear issues. The replacement bearing is pressed in flush against the back side of the bearing plate, I coat the inside of the bore with high strength Permabond retaining compound, so the bearing isn't going anywhere. Bearing part number is 88038.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-24-2007 07:04 PM                     Thanks Randy for that tip... I will also do that on future rebuilds. Is that 88038 an ABEC7 or just an ABEC 3 bearing? Also, isn't that the bearing that was used on the outboard side of the star of the motiograph AA movement? Any ideas on a bearing for the outboard cam side? Mark  |  IP: Logged Randy Bowden Expert Film Handler Posts: 146 From: Portland, OR, USA Registered: Aug 2000 posted 10-29-2007 02:56 PM                     I'm not sure about the ABEC Rating. I would have to ask my supplier. On the cam side I use a dual rubber shielded bearing as well, part number DDRIF1438.  |  IP: Logged

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