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Author Topic: Flywheel problems on my Century Projector Randy Bowden Expert Film Handler Posts: 146 From: Portland, OR, USA Registered: Aug 2000 posted 07-30-2007 02:21 PM                     I get my fillister head screws locally at winks hardware, however the only one I ever really seem to need is the 8-32 x 5/8 that goes to the GR-7 Gear. Yes, you can take your bearing into the local bearing house and a micrometer is all you really need to figure out what bearing you need. Same can be done with oil seals.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 07-30-2007 02:26 PM                     I can see where John is coming from and give him credit for such a question, yet with my experiences I've had no problems with bearings purchased and used with just having the bearing number - even though my bearing purchases been limited to projector rebuilds and not with heave machinery devices where work tolerances are more drastic.  |  IP: Logged James Westbrook Phenomenal Film Handler Posts: 1133 From: Lubbock, Texas, Usa Registered: Mar 2006 posted 07-30-2007 02:31 PM                     I wonder if bearing shops would carry the plastic bearings that Speco uses on their payouts...or at least used to use on their payouts. The last time I ordered some from them, they sent metal bearings and these were harder to install and to get to work than the plastic ones.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 07-30-2007 06:51 PM                        jhawk" You are correct on both accounts. I once bought a batch of 250 new BG-9 from the local bearing shop who used a micrometer to measure. The error on the I.D. was just enough to lure him to a "standard" bearing which, alas, was not correct. I "ate it all." Louis  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 07-30-2007 09:51 PM                     Well, measurement error is one problem, but I think grade is more serious and subtle. Let me take the case of sound drum bearing on the Century R3. When we installed CE's STRD-30 readers, we replaced those bearing, because they had started to stick. I think this is the BG-0726. If you just measured the dimensions, you'd be tempted to use an ND77R8 bearing, which is a $5 bearing. But if you call Strong, they'll tell you that its an NHBB-SSR1812ZZ-RA8. Cost $17 from the local bearing supply house (versus $24 from LaVezzi or $32 from a local dealer). What goes wrong if you use the wrong grade bearing? Well, probably you are compromising something. In the case of the sound drum, I imagine it worsens wow and flutter. Or maybe just lifetime. (Now, perhaps someone will tell me that actually the SSR1812ZZ isn't anything special and paying all that extra wasn't warranted...but I wouldn't want to make that call.) --jhawk  |  IP: Logged Randy Bowden Expert Film Handler Posts: 146 From: Portland, OR, USA Registered: Aug 2000 posted 07-31-2007 02:07 PM                     That is interesting. I have always just used a 7R8 bearing without any issues. I am also curious about the difference. The point that I was trying to make earlier about the micrometer is that, if you are a theatre or a tech with a failed bearing and in need of a replacement ASAP. Head down to local bearing shop with dead bearing in hand.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 07-31-2007 08:47 PM                     Jhawk, The New Hampshire Ball Bearing they spec. is a decent bearing... not the best but pretty good for production stuff. If they'd only use bearings that good in Simplex produts . Barden Bearing is THE preemenent bearing manufacturer in the USA and their products are way superior to NHBB but generally costs at least 4 times more! The lower cost NHBB you mentioned is stainless steel and precision and a precision bearing is exactly what belongs in any rotary scanner mechanism. Christie also uses precision bearings in their projectors. Mark  |  IP: Logged

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