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Thread: What did you learn today?
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21st Aug 2012, 05:03 PM #91Most Valued Member
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21st Aug 2012, 05:05 PM #92Most Valued Member
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10th Dec 2012, 11:22 AM #93Most Valued Member
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I learnt not to use an ultrasonic cleaner on the kitchen bench.
Luckily there is a new one in the pipeline or I would be in it deep!
Stuart
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10th Dec 2012, 06:21 PM #94Philomath in training
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Try in an unobtrusive place first, but a little bit of neat White King on a rag will probably remove the marks. It will bleach the rag you use too...
Michael
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10th Dec 2012, 06:53 PM #95Most Valued Member
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Why can't you put an ultrasonic cleaner on the kitchen bench? I'm intrigued.
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10th Dec 2012, 10:34 PM #96Most Valued Member
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Hi Michael,
No White King so I just used some bleach(out of date bleach at that, does bleach slowly turn into something else?) Thanks
Hi Jack,
Because it leaves little circles on the bench that are tricky to shift. though the bleach has improved things will have to see how it goes.
Stuart
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11th Dec 2012, 06:52 AM #97Philomath in training
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Bleach will slowly loose strength over time. You might have to do a couple of rounds to remove the mark totally if the stuff is old. Newish White King is phenomenal at removing traces of things that husbands do that would otherwise be frowned upon.
Michael
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15th Dec 2012, 07:59 PM #98
What did i learn today? That wearing your wedding ring whilst you are dipping your hands into even a weak solution of caustic soda is a bad idea. I was using latex gloves but at the concentration i have it is pretty safe, and i have been rinsing my hands in my vinegar solution afterwards......Any way some caustic found its way under my ring, which is wide, almost 9mm, and over the day has taken the top few layers of skin off......ouch! Ring is ok though.......
1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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15th Dec 2012, 09:23 PM #99Dave J Guest
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15th Dec 2012, 09:29 PM #100Senior Member
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11th Feb 2013, 06:48 AM #101Most Valued Member
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I learnt that on your first attempt at multipoint screwcutting you should remove the carriage stop before sending the carriage towards the chuck using power feed. It certainly made a mess of the brass shear pin on the leadscrew. Mind you, the manufacturer had already made a mess of making it in the first place.
Phil
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18th Feb 2013, 12:01 AM #102Member: Blue and white apron brigade
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Today I learned that if you want to make an MT on one end of a metal rod and cut a thread on the other it's easier to cut the thread first.
Actually it did not turn out that bad as I was able to put the MT2 into an MT3-2 adapter and bung it straight into the Hercus headstock.
It was aslo good test for the newly cut MT2 which did not move a whisker.
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18th Feb 2013, 08:11 AM #103Most Valued Member
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18th Feb 2013, 02:33 PM #104
bearings don't like press fit
I've been repairing the head of the old wipper-snipper. The bush bearings supporting the cutter head shaft had won out. I thought a couple of small deep groove bearings would be a better solution so bored out the alloy housing and trued up the shaft to 9mm (down from a worn 3/8").
I learnt: A thou or two is TOO much for these miniature bearings. The new bearing pressed into the housing ok but was rather rough to turn.
Second go with much lighter fit and a drop of thread lock on the outside to make sure it did not turn in the housing was much better. I did need to make a bush to act as the replacement bearing housing as I needed a couple of goes to get the sliding fit! .
Hope the repair lasts a reasonable time after all the mucking around. (It has 2 bearings side by side top and bottom, 9x14 mm races, the head is driven by a speedo cable type of flexible drive)Last edited by HavinaGo; 18th Feb 2013 at 03:01 PM. Reason: can't spell - nor convert from metric to imperial
cheers
David
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A society grows great when old men plant trees whose shade they’ll never sit in. (Greek proverb)
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18th Feb 2013, 02:58 PM #105
Bearings don't like no oil
What I learnt: Deep groove ball bearing races left without oil turn into a heap of rust surprisingly rapidly!
In a parallel project to the above effort I am repairing a portable petrol engine powered water pump. Engine, 3.5Hp Briggs and Stratton was a pain to start. The long and the short was it had little compression. As the engine had done little work I could not bear to throw it out so have ended up pulling it down and now conclude 2 problems - a) head warped so gasket not sealing, b) crankshaft rusted under seal on pump side so no crankcase pressure to run the fuel pump.
While waiting for parts (seals) I soaked the ball bearing race (pump side of crankshaft) to get out the old oil, cleaned up the shaft, flattened the head (in mill), lapped in valves etc.
What I did not notice was the rag fell into the turps I was using as solvent for the bearing clean up and all the turps evaporated between one weekend and the next. (Melbourne has had a run of 30+ with high humidity)
I'm now looking for a new bearing in addition to the other parts as the rust has left its coat all over those delicate running surfacescheers
David
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A society grows great when old men plant trees whose shade they’ll never sit in. (Greek proverb)