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91
Project Logs / Re: New Tractor Shed
« Last post by awemawson on September 14, 2017, 05:51:59 PM »
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  :bugeye:

Now I've used 11 of these patch panels elsewhere satisfactorily, but this one is definitely for the bin  !
92
How do I?? / Re: Math for machinist tapers...
« Last post by Pete. on September 14, 2017, 04:24:17 PM »
I only watch some of the youtube lot, I get bored with some where they waffle on with a bit of practical in between but I like Joe P, he does short and to the point vids.
93
How do I?? / Re: How do I measure a spindle taper?
« Last post by Pete. on September 14, 2017, 04:17:11 PM »
I would use the two balls method and draw it in CAD. Use the measuring tool to get the angle.
94
Project Logs / Re: Spindle problem with cincinnati tool and cutter grinder 2 spindle
« Last post by PekkaNF on September 14, 2017, 03:54:05 PM »
Armed with 0,002 mm/div lever dial indicator and some hardware tried to measure concentricity of inner ring to ball races, barely could measure outer ring, inner ring was easier.

I need a fixture or setup, this size bearing is too small to measure on surfavce plate. Hard not to move the bearing while it is rotated.

Hopeless to measure internal clerance, indication is clear enough, but too many moving parts.


Pekka
95
Project Logs / Re: Spindle problem with cincinnati tool and cutter grinder 2 spindle
« Last post by PekkaNF on September 14, 2017, 03:48:10 PM »
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.



96
How do I?? / Re: How do I measure a spindle taper?
« Last post by mattinker on September 14, 2017, 03:22:52 PM »
It might help if we know what the Lathe is... Colchesters have their own tapers that are just bigger than a 5MT and have adapters to take them down to 3MT. Have you checked if it mentions the taper on Tony's site?

An ER32 collet holder up the nose of a lathe that size  :scratch:

Jo
I'll answer for adev, as i have the same Edgwick mki that he has. It's a proprietary spindle nose taper. the spindle bore is 1 3/4 inches so we are over Morse 5. I think Er32 and 40 could be very useful on this lathe especially as it a 1940's modle, so chucks are pretty worn out!!

Regards, Matthew
97
Project Logs / Re: Liquid Fuelled Rocket Engine
« Last post by billmac on September 14, 2017, 03:01:37 PM »
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.
98
Project Logs / Re: Surface grinder restoration and scraping
« Last post by Pete. on September 14, 2017, 01:05:52 PM »
Did you ever take something on and then realise it was a much bigger job than you had expected, but by that time your in too deep?  :doh:I was just going to tickle the ways into alignment but...... :Doh:

Several times but you seem to be coming through your trial by fire admirably. I like your systematic approach and clear no-frills commentary. Quite refreshing to not have to sit through a load of rambling rhetoric.
99
Project Logs / Re: Spindle problem with cincinnati tool and cutter grinder 2 spindle
« Last post by PekkaNF on September 14, 2017, 08:27:47 AM »
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 :lol:

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

100
How do I?? / Re: How do I measure a spindle taper?
« Last post by PekkaNF on September 14, 2017, 08:15:43 AM »
I have quick and dirty method: to measure the angle, but you still have to connect the dots.

Pat playdough halfway (centre height), you only need two ridges.....then take two utility knife snap-off blades and gingerelly pres sharp parts snugly inside the taper, sharp part out. Then use our favorite zap (or epoxy glue) between the blades and after the has has set, pull out the "wedge". Now that is brittle and usless for measurement, but set it on something flat and put good dollops of glue to glue it down on each end of the blades and then you can measure it. Not accurate enough to make replacement, but good enough to identify taper.

Pekka
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