What did you do today (2015)

[Clive HartlandParticipant @clivehartland94829]

I now have another task, last night in the middle of cutting a spacer in the lathe the motor failed to re-start,. It just buzzed so i will take it off and investigate what is happening. Trouble is getting at it as it is up against the wall. I think I will lift the whole motor and bracket which is easily loosened. The Lathe is an ML10. I am not considering changing the set up and as the motor has been working fine for some 26 years thats not bad as far as I am concerned. Its an original Myford issue motor. Somehow I have to fit it in with all the other things I am doing so priority takes over and it is now first on the list!

Clive

[Neil WyattModerator @neilwyatt]

Blimey Michael,

That video captures the darkness, huge emptiness and long ages of space…

Neil

[Nicholas FarrParticipant @nicholasfarr14254]

Posted by IanT on 24/03/2015 19:06:12:

Interested in the label on your Drummond lathe Michael (nice find by the way – even in it's 'rustic' finish) – as it gives the address as being "Rydes Hill, n. Guildford"

I mostly grew up in Guildford (latterly in Rydes Hill in fact) and I know where the old Drummond factory used to be. What has always puzzled me is that all the adverts I've ever seen for Drummonds (old pre-war MEs etc. ) always gave their address as being "Rise Hill, Guildford".

And yet on your lathe it's spelt the way I would expect…?

Anyway – I'm sure it will clean up very nicely with some elbow grease…

Regards,

IanT

Hi, I've looked through quite a few of my early ME's starting at 1921 and yes! they all say Rise Hill, however, I have a volume from 1909 and the ads in those say Rydes Hill and one of the Special Attachments catalogues from Drummond's that I have, say Ryde's Hill. See picture below, interesting to see an ad for "The Model Engineer" exhibition for 1909 also.

Regards Nick.

Edited By Nicholas Farr on 25/03/2015 10:46:44

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Michael Gilligan on 24/03/2015 19:46:45:

As for the appropriate exposure for Venus; it's worth remembering that the planet is not radiant … it's just very reflective [Albedo about 0.65], so the brightness is only about a third of a stop down from the Sun.

.

With apologies for my sloppy posting:

That should, of course read "… only about two thirds of a stop down from the Sun."

MichaelG.

[Neil WyattModerator @neilwyatt]

Sorry Michael, it's far from that simple. the light from the sun hitting a point on Venus is uni-directional but Venus reflects it more or less even;ly in all directions so it';s surface brightness is far, far less.

Consider the difference between a mirror and white sheet of paper. The paper has a similar albedo to Venus, but you can't blind yourself staring at white paper in the sunlight.

Neil

[BazyleParticipant @bazyle]

Rydes or Rise didn't matter back then. The postman wouldn't have looked past "drummond"

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Neil Wyatt on 25/03/2015 14:12:44:

Sorry Michael, it's far from that simple.

.

Ah … I thought it was you that was struggling to get the exposure right

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Neil Wyatt on 25/03/2015 14:12:44:

Consider the difference between a mirror and white sheet of paper. The paper has a similar albedo to Venus, but you can't blind yourself staring at white paper in the sunlight.

.

Now consider this [as yet unsubstantiated] list, which shows polished chrome to have a similar albedo to white paper: The difference being that one is specular and t'other diffuse [and you might indeed blind yourself by staring at the reflection of the Sun in a polished chrome plane mirror].

Reflective clouds of Sulphuric Acid cover Venus, and, given the tiny angle that it subtends from Earth; I would suggest that it reasonably approximates a point source. … So we're getting close to specular reflection.

MichaelG.

.

P.S. … The relative brightness of Sun and Venus, in the visual  Magnitude system, would seem to contradict my argument; but I think the Magnitude values may be skewed by the very different angles subtended. [it is, after all, based on visual perception].

Edited By Michael Gilligan on 25/03/2015 21:49:21

[Neil WyattModerator @neilwyatt]

Michael, I fear we are entering the regions of sophistry!

The simple fact is, through welding glass with a transmission of about 1.6% I was able to use f8.3 ISO80 at 1/200 sec.

This pic of venus was 1/500 sec ISO-800 f5.9.

Very, very roughly (mental estimation) the sun must have a surface brightness a good 200 times that of venus.

The angle of teh source has nothing to do with intensity. Look up lambertian and specular reflection.

[John Stevenson 1Participant @johnstevenson1]

Posted by Neil Wyatt on 25/03/2015 22:03:12:

.

Think you got some crap on your lens ?

[Michael GilliganParticipant @michaelgilligan61133]

Neil,

I agree that "the angle of the source has nothing to do with intensity" … that's why I was careful to mention the "visual perception" aspect of Magnitudes.

This has been an amusing discussion, but; since we have no idea if your image of Venus is over-exposed [i.e. burned-out] we should probably agree to differ. … it's getting us nowhere, and probably irritating the others.

MichaelG.

[Jesse Hancock 1Participant @jessehancock1]

What I find irritating is doing the washing or driving in town or the editor on here, not discussion on a subject which is perhaps only of interest by a minority sure but it's all part of the tapestry guys. So, long may we debate the varied aspects of this hobby.

[Jesse Hancock 1Participant @jessehancock1]

Yesterday I was given a Lesro Kit of a Pilot boat partly started I guess you'd say. I was half way through machining the cylinders for my Wesbury Sealion.

I immediately turned my brain to jelly wondering what the guy expected me to do with it in terms of when rather than how since I am a boat enthusiast. I remember making a Vic Smeed V hulled design back in about 1966, I think it was a Remora which was the last hard shine design I tackled prefering round bilge boats to tea tray water skippers.

The second thing I did yesterday with no result, was try and find a cable to connect my phone to the complicator and thus take piccys to post on here. Hence no piccys of gift horses either.

I guess I will console myself with taking an inventory of the kit parts and who knows it might be complete enough to finish.

PS: In case you're wondering I doubt the sealion will fit under the deck head.

Edited By JasonB on 26/03/2015 13:07:55

[Clive HartlandParticipant @clivehartland94829]

This afternoon I started to remove the motor mount complete with motor off the lathe, its on the floor now and I am going back in to see if I can find anything wrong with it. If I find nothing then it can only be the control gear/contactor

It's such an awkward job getting behind a lathe with all the stuff piled up around it, I feel something has to go! Perhaps the saw bench and planer. Or, its a boot fair job.

Clive

[Bob RodgersonParticipant @bobrodgerson97362]

Today I have been back to the days of my youth. I was given a rather nice rear induction two stroke marine engine by on of my local club members. He had been given it by somebody who could never get it started, he couldn't either.

When I got it it was in bits but I quickly established that a small piece of the spray bar had been snapped off at the threaded end and was too short to enable decent adjustment. I made a new spray bar last night and fitted it to the engine and after a few minutes of trying to start the engine in the wrong direction got signs of life.

A few more pulls on the cord and it started – very satisfying.

Anybody got any ideas as to what make of engine it is, there are no identification markings on it anywhere?

I,m Not too sure how to post video from Photobucket so I have included all of the links.

Video

Edited By JasonB on 26/03/2015 16:16:07

[Bob RodgersonParticipant @bobrodgerson97362]

Here are a couple of still shots of the engine in my previous posting.

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They are excellent examples of how to take a fuzzy picture.

 

Edited By JasonB on 26/03/2015 17:28:13

[Neil WyattModerator @neilwyatt]

Hello Bob,

See HERE for details of how to post using photobucket.

Neil

[EdHParticipant @edh]

 

Hi Bob Rodgerson.

Your engine looks like an ED Sea Otter 3.46cc marine diesel

Does it have a R/C throttle?

 

 

Edited By EdH on 26/03/2015 17:22:20

[Bob RodgersonParticipant @bobrodgerson97362]

Hi Ed,

the engine does have an RC throttle. I suspected that it was an ED engine because there was a marine fuel tank with an ED label on it in with all the bits. I used to have an ED Viking (I think) but it had a much larger water jacket proportionately than the one on this engine. and the RC throttle was a better design too.

[Speedy Builder5Participant @speedybuilder5]

Hey Bob, take it easy as it should be water cooled. Where did you get your diesel fuel from as it is a scarce comodity. If it is an Otter, was that the marine version of the air cooled ED Hunter ? ED was Electronic Developments of West Molsey. I cycled over there from Heston one summer holiday to get my ED Bee marinised, could not have cost much as I only had pocket money. Bet you couldn't do that sort of thing today.

BobH

[Bob RodgersonParticipant @bobrodgerson97362]

Hi Bob,

I am well aware it is water cooled. At least it isn't like the ED engines that had a brass water jacket. They were soft soldered and if you ran them dry they would fall apart.

I have limited it's running time to about a minute. Just enough for it to get hot.

[EdHParticipant @edh]

Hi Bob,

You can read about ED engines here, it's quite long so a FIND for Sea Otter might help

http://modelenginenews.org/cardfile/ed_story.html

[Swarf, Mostly!Participant @swarfmostly]

Posted by Jesse Hancock 1 on 26/03/2015 12:54:28:

SNIP

PS: In case you're wondering I doubt the sealion will fit under the deck head.

Edited By JasonB on 26/03/2015 13:07:55

Hi there, Jesse,

If your boat is short of headroom maybe you should make and fit a scale model of the Norman T300 horizontal twin?

Best regards,

Swarf, Mostly!

[Bob RodgersonParticipant @bobrodgerson97362]

Bob,

I forgot to mention that I was given a tin of fuel with the engine, however I have a four stroke diesel which I mix my own fuel for using paraffin and castor oil and to give it a boost I put some easy start into the mix. It works ok

Bob R.

[Clive HartlandParticipant @clivehartland94829]

I started to take the mount and motor apart and checked the wiring and all seemed OK, the resistance in the field coils was also OK. I cleaned it all up and turned my attention to the Contactor. I cleaned all the contacts and operated it by finger pressure and nothing was sticking so I put power on and it worked fine and the motor on the floor went Ok in both directions. So what was the problem? I dont know! Its all back together now and I got a telling off for getting black grease on my shirt to boot.

Clive

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