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Author Topic: Xetron failsafe bearings Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 08-22-2004 01:42 PM                     I'm trying to find replacement bearings for the Xetron Opticue failsafe. The ones that ride on the film. I'm looking at page 286 of the Grainger catalog. Those look like the type of bearings I need. But I can't find an exact match. I measured one of my bearings. Bore = 6mm (.25"), diameter = 16mm (.625"), width = 5mm (.1875"). The closest match I could find was the second from the top, at 5x16x5mm. Will a 5mm bore fit? Ther are also a couple of close matches toward the bottom of the page under "Inch Series." The closest ones are .2500 x .6250 x .1960 or .2500 x .7500 x .2812. These have the same bore, but the diameter (on one) and the width (on both) are larger. Will either of these work? Of course, if you know where I could get exact replacements, by all means feel free to let me know! Thanks in advance. P.S. I was asked by my tech to look into getting them from Grainger because it would probably be cheaper than buying parts from Xetron. I wouldn't have expected one bearing to cost ten bucks, though.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-22-2004 02:27 PM                     Best to take the bearings off and take them to a local bearing distributer. They will measure them up and give you want ever options are available. Mark @ CLACO  |  IP: Logged Kyle Watkins Expert Film Handler Posts: 185 From: Stuart, FL, USA Registered: Sep 2001 posted 08-22-2004 02:39 PM                     Check out an good auto parts store, there a good shop up here in stuart, they had ever bearing that we needed, including metric. Discount and common stores i had no luck finding them there. Also they were a very lot cheapter then our dealer. You may want to buy one form them so you have a spare to go looking with.  |  IP: Logged Jon Miller Jedi Master Film Handler Posts: 973 From: San Diego, CA, USA Registered: Sep 1999 posted 08-22-2004 03:23 PM                     McMaster-Carr is also worth a try. Visit the site and search for "Ball Bearings". The bearing you are looking for sounds like a type R4, described on page 1014 of the online catalog. If the bearing you want is in stock in their Atlanta warehouse, you should be able to receive it within two or three business days of ordering.  |  IP: Logged Dan Lyons Jedi Master Film Handler Posts: 698 From: Seal Beach, CA Registered: Sep 2002 posted 08-22-2004 04:41 PM                     The bearings should have the manufacturer and model code stamped on it.  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 08-23-2004 12:16 AM                     Yeah, but how do I decipher that code?  |  IP: Logged Dan Lyons Jedi Master Film Handler Posts: 698 From: Seal Beach, CA Registered: Sep 2002 posted 08-23-2004 12:44 AM                     you don't. you just tell the bearing supply company what the bearing says, and they'll send you what you need. btw, best not to substitute brands IMO. danny  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 08-23-2004 06:44 PM                        WHY?!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-23-2004 07:16 PM                     1. Because you may end up with the wrong type of seal on the bearing. Ideally it should only have a shield on each side. A bearing substituted with a seal, especially the rubber type will have undue(built in) drag imposed on it and may not turn freely with the movement of film resulting on possible film damage. 2. Another thing to consider is that bearings that are making contact closures sometimes have a conductive grease or oil in them to aid in making better contact between inner and outer races. A "Stock" bearing off of a bearing suppliers shelf is definately NOT going to have any conductive compound inside it. For these type of bearings its best to order them from the cue detector maker, or get bearings that have little to no oil at all in them, but good luck in that one as its usually special order and in large quantities fomr any bearing distributor! Mark @ CLACO  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 08-23-2004 07:24 PM                        1. Different styles of seals/sheilds on a bearing isn't the same bearing. You could get different bearings of the same brand, brand has nothing to do with it. 2. Conductive properties still aren't a factor of brand. Granted you might have better luck ensuring consistent properties if you get the exact same bearing (part number) from the same manufacturer, but if the bearing's conductive properties are actually in it's specs you should be able to cross it to another manufacturer's, if one exists. We cross conductive bearings all the time for various machines, but it helps that we've got a good bearing shop to deal with.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-23-2004 07:45 PM                     The problem with using off the shelf bearings for conductive purposes is that the grease in them actually prevents conduction... acts as an inslator. Different manufacturers use different types and amounts of grease which is going to vary how well it will conduct. So yes, different manufacturers bearings may very well exhibit different amounts of conduction of they were measured with a milliohm meter. Grease in a cue detector bearing is just not a good idea either because eventually the grease will dry out and may cause the bearing to hang up. I've seen this happen several times. A lightly oiled bearing would probably work better for conduction. It is also possible to remove the shield from a bearing and clean out the grease and lubricate it with some conductive oil. Seals and shields can be replaced if removed properly. Frankly, in my experince, its always been less expensive just to get these bearings from the cue detector manufacturer. Those always come either just oiled or with conductive oil in them and the proper shield. P.S. have never seen specs listed for the conductive properties of a bearing in any bearing lit. Also different manufacturers seals will also exhibit different loads on the bearing itself even if the bearings are all the same part number. Mark @ CLACO  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 08-23-2004 07:57 PM                        I've never seen them in any catalog either, but the bearing house we deal with seems to have some sort of list, because they've always sent us bearings that conduct well when we've asked for them.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-23-2004 07:59 PM                     I suspect they're sending you either dry bearings or oiled bearings. Dry bearings would be very bad because of corrosion possibilities. They may also have facilities to remove the grease and oil them. Some facilities do. Motion Industries here can do that but you pay for it. Mark @ CLACO  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 11-25-2005 12:26 PM                 It has been 458 days since the last post.  |  IP: Logged Cory Isemann Jedi Master Film Handler Posts: 500 From: White Plains, MD, USA Registered: Jun 2004 posted 11-25-2005 12:26 PM                        Bump. Did anyone ever find a model number for these bearings? I suspect I have the same ones, and I can't find a model number or anything for the failsafe to look up a parts list. Pardon the crap pictures.  |  IP: Logged

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