MadModder

I gave Darren a bit of a nag today and he turned up a little after lunch to start fitting the pedestrian door.

Before that I spent a frustrating couple of hours connecting up the telephone (6 pair) and two Cat5e cables to the wall box I'd previously prepared. The telephone cable being terminated on genuine Krone blocks was no issue - however the Cat5E onto a Chinese 12 way patch panel was a nightmare. Connected it up using it's 'punch down' connections easily enough, but when I came to test it I got very intermittent results. Sometimes good continuity, other times nothing. In desperation I put a pair of standard CAT5e sockets on the cable for testing and had no problems what so ever. Conclusion - this patch panel is pants 

Now I've used 11 of these patch panels elsewhere satisfactorily, but this one is definitely for the bin  !

I would use the two balls method and draw it in CAD. Use the measuring tool to get the angle.

I soaked the bearings overnight on IPA and got all grease and most of gunk out.

Self-aligning ball bearing 2305 seem to clean up completely and is charming himself with clear iternal clearance as it should.

The ball bearings are bit more troublesome. The ball retaining ring (cage) seems to be shedding some stuff. Part of that is something like flakes or something, bit like grud you get when put wrong type of oil on sychro gear box....and when viewed 20x magnification shows some metallic grit on surface. The cage sheds that stuff in 2 minutes on ultrasound wash (heated, about 70W) that first I though I ruined it, balls would not turn easy, but when rinsed in IPA it pretty much comes out.

So, the plan is to find replacement.

Carl -

I have just had a quick look at your web site. I think your posts will be very interesting and I look forward to reading them.

Yesh and sometimes a little of discretion can ruin the whole thing....you think you have the exactly right pressure plate and all and then something is skewed and then it's easily too much force on wrong place and when bearing just jerks, instead seating right....cold sweat breaks.

These are small and relatively cheap bearings and I have suspicion on all work I do. I don't think I will cause irreversible damage, just lost work/dignity, some lost time and cash. That's all.


Tried shortly to google good method and DIY-fixture or contraption to measure bearing inner clearance (radial/axial) and to measure "high spot" on IR/OR that is bearing inner/outer ring coaxiality in relation of raceway....my English her is pretty sketchy, because I find only chinese videos

This looks nice, but I don't get how that frictionless and differential measurement works:
http://www.prattandwhitney.com/Content/LabMaster_Universal_Bearing_Measurement_Instrument_.asp

Click those pictures bigger at the bottom of the page.

Thinking of using V-block and that sort of stuff at home and have bearing resting over a surface plate, but I'm probably going to measure more my weebly-woble than bearing on my first try.

Any advice?

Pekka