Todays update from Bodgers Lodge

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Mark C on 10/02/2015 20:59:14:

"remain in an uncured stage over a long time when they are exposed to an adequate supply of air" seems to indicate that all our old bottles may well be in a state of partial cure due to a lack of air?

.

Quite so, Mark

That's essentially what those three bullet points were getting at.

MichaelG.

[John Stevenson 1Participant @johnstevenson1]

Dunno how true but I was told that when it was invented it had a very short life as any sealed container allowed it to go off. Apparently the container it's now stored in is permeable and allows air in but not the product to leak.

Like many of you i have stuff in bottles from last century but the day to day stuff is relatively fresh because I use so much of it.

[Martin KyteParticipant @martinkyte99762]

Keep it in the fridge

Martin

[Neil WyattModerator @neilwyatt]

> Keep it in the fridge

Good advice, you have to allow for JS running his workshop at 40C

Neil

[ChrisHParticipant @chrish]

40C? That's 104 degF in real money. In most ships engine rooms I sailed in that was quite a cool engineroom temp, but we didn't bodge stuff like wot Mr. Stevenson does every day, far too technical, just kept the job running was the game. How can he work like that in that temp on technical stuff – us lot would be constantly leaking everywhere.

Chris

[JasonBModerator @jasonb]

Posted by ChrisH on 11/02/2015 20:02:45:

How can he work like that in that temp on technical stuff -ere.

Chris

I'm told he works in just a pair of Speedos

Edited By JasonB on 11/02/2015 20:25:24

[ChrisHParticipant @chrish]

Yuk!

[Neil WyattModerator @neilwyatt]

At least it's not a mankini.

Neil

[ChrisHParticipant @chrish]

Even so…………. got my sanity to think about, that idea is not doing my thinking any good, therefore sanity not good either……

Chris

[John Stevenson 1Participant @johnstevenson1]

Heretics, it doesn't get that hot all over, still have some dark damp corners.

[David ColwillParticipant @davidcolwill19261]

The reason he keeps the workshop at that temperature is that he can increase the capacity ot the lathe by a couple of inches between centres.
David.

[Mike PooleParticipant @mikepoole82104]

I worry about the French, the last campsite I stayed at insisted you wear speedos to use the swimming pool, bald overweight men in speedos it not the best image, luckily I can't see myself so it's not my problem.

Mike

[mark costello 1Participant @markcostello1]

Why would they insist on speedo's? Inquiring minds and all………Also found a place to stay away from. Order eye bleach if going there!

[ChrisHParticipant @chrish]

Yes ……. but bet they are HOT dark damp corners, nothing in the post said anything about cool corners.

The French do seem to have a thing about speedo's – found this in Brittany too. Think it's something to do with the short and curlies. Not my problem either, not bald but way overweight, but likewise can't see myself so no worrys.

Chris

[John Stevenson 1Participant @johnstevenson1]

Semi interesting one in that we have some bike guys on this board.

Now the Germans have a reputation of engineering, personally I think most of their stuff is over engineered and fussy.

BMW in their infinite wisdom of the twin cylinder boxer engine machine a thread on the alloy cylinder heads for the exhaust nut to screw on and secure the pipe, pretty common but what isn't is they then screw an alloy exhaust nut onto this thread.

Few miles down the road and all comes loose, tighten up and it's all OK, until you come to strip down and it welded itself to the head. The smart mechanics know this and split the nut, clean the thread up and fit a new nut. However if it's been shuffling are the guy doing the job isn't familiar with the self breeding habits of alloy on alloy it rips the thread up on the head. Only way round this according to BMW is to fit a new head.

Well being told there is only one way to do a job is a mortal challenge……….so set the head up on the mill, opposite hand boring bar fitted to the boring head and waz the thread off with a bit of the spigot.

Just started the job on Monday when remembered to get a picture, not that clear but it does have about 1/2 a thread, a bit ripped up on the spigot.

So thread off and reduce the spigot down from 52mm to 46 using the old formulae "If it looks right"

So now had to leave it as when I checked up I'd no bronze in stock so ordered some Monday dinnertime.

Bronze came today from Leeds Bronze [ no connection other than a customer ] and they have a £30 minimum order now but that's not too bad as bronze is expensive. Ordered 12" and it had to be charged out at £30 minimum but if I had 15" it was still £30, so we had 15" which is fantastic value seeing as many on-line metal suppliers charge from £15 to £25 PER INCH.

This is what £30 worth of bronze looks like.

That's cored bronze BTW 58mm OD and 40mm ID.

Turn it down to 52mm and belt a length of 2mm pitch thread on so got some future spares and these are always ongoing.

Part a slice off and bore out and now got a ring ready to be wormed up and shrunk and pressed on.

Then belt and braces, drill 4.2 mm and tap 'nearly' thru with M5 tap. Screws two brass screws in, cut off and clean up with a thread file to pin the sleeve.

Just possible to see one of the screws where the felt tip blob is, other one still not cut off but basically job finished.

Another happy camper.

[OuBallieParticipant @ouballie]

I'm with you John, as when I'm told I cannot, or only this way, I just naturally rebel and stick a finger or two up, and look at other ways.

That's a bl@@dy good price for the bronze! I got shafted for the small length I bought to make the TS Overarm bearing

Geoff – Lesson learned

[WorkshopPeteParticipant @workshoppete]

Hi All

Back to Loctite I have had a bottle of 603 for ever but suddenly it has just stopped working it will not go off no matter how clean I make the job. Its still liquid flows as well as usual but will not go off. My workshop temp is held around 50 f. I bought another bottle and no problem on the same job. I was down at the club the other day loctite came up and another member has exactly the same problem.

Peter

[jason udallParticipant @jasonudall57142]

Bearing in mind the temp. an air cooled head can get to esp. Exhaust…
My first thought was what’s the coefficient of expansion DIFFERENCE
between ali and bronze. ..
So I looked it up.

Ali 0.26 % for 100C
Bronze 0.21% for 100C…
So thats 0.05%
Since the al is inside the bronze…the joint will get tighter. .by 0.05 %.
Thus on 42 mm
Thats 20 odd microns…
Of extra grip…

So now I know ..what Saint John knew without all the worry…

[John Stevenson 1Participant @johnstevenson1]

I'd calculated in me 'ead that it was 23.473595 microns [ approx ] but then again it's 46mm not 42mm

[jason udallParticipant @jasonudall57142]

Ahh..why spoil the magic…mere mortals like me need to turn the handle..

[Michael GilliganParticipant @michaelgilligan61133]

Posted by John Stevenson on 04/03/2015 17:43:03:

Turn it down to 52mm and belt a length of 2mm pitch thread on so got some future spares and these are always ongoing.

Nice work, John

I note you used that swing-up threading tool that I have seen you mention elsewhere.

MichaelG.

[JAParticipant @ja]

John

How many miles has the bike done? If it is anything over 80,000 I trust the valve guides have been replaced. The BMW boxers of 30 or so years ago had a reputation of loosing their valve heads when the guides were worn. The guides were too short. A loose valve head makes an awful mess of a cylinder head. Hamrax Motors in west London used to have such a damaged head on display in their shop. It was frightening.

Excuse me if I am telling you how to suck eggs.

JA

[UnknownParticipant @unknown]

Anyone might think that you knew what you`re doing, John!

[John Stevenson 1Participant @johnstevenson1]

JA,

No idea, not my brief to work on the engine, all I get is a cylinder head and told, thread is stripped.

I do the head and send back out.

I love onesey twosey jobs that fly out the door, If you get a good run you can weld a couple up and be doing something else whilst the weld dries but that job is still on the clock, then go back machine them up and stack them up again until you have them all done and shift to the mill for keyways all done at one go.

Very easy to to be able to book 18 + hours for a 10 hour day and no one moans as they still get a cheap job compared to replacement costs, if they can be replaced.

[JAParticipant @ja]

John

OK.

JA

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