LGB Mogul Driving Wheels

[electricity_bill]

Hello again
Simple question - should the driving wheels of my LGB Mogul rotate when I push it by hand with no power applied?
Bill

 

[Neil Robinson]

My basic mechanical theory is very sparse but I think I'm correct in saying that a gear train can be pushed in reverse if it has an efficiency of greater than 50%.
From experience LGB use several different gear systems, some of which can be pushed backwards and others that can't.
So long as the motor turns the wheels without coming out of mesh don't worry.

 

[ntpntpntp]

Must admit my gut feeling is that it would be very difficult to push a mechanism that involves a worm gear, which the Mogul seems to possess according to the service diagram.
<edit>... but of course I defer to Kimbrit's experience</edit>

I've never tried pushing my Mogul. I was taught by my Dad from a very early age never to try and push my toy trains for fear of damaging the mechanism. That advise has stuck and naturally has been passed on to the next generation!

 

[stevedenver]

yes with modest firm pressure they all should turn

 

[electricity_bill]

This was my thought - you cannot back drive a worm gear. I was worried that when I had reassebled the loco after fitting a replacement motor, there was a problem with the gears meshing correctly. The comments seem to suggest that all is well but I still do not know how you can back drive a worm gear - my Meccano tells me so.

Bill

 

[Spule 4]

Well, you can coast in a Peugeot 203 or 403.... http://www.grapa.net/peugeot404/404rearaxle.htm

 

[New Haven Neil]

Worms can be reversible, but like other Neil, my basic mechanics was a while ago, ahem, - but the 50% sounds reasonable, it's all to do with the pitch of the worm. Old Honby-Dublo mechanisms can be turned with a bit of effort......

 

[pugwash]

Oh, and where are you going to get the xylene or toluene to clean the muck up? They were banned in Britain about 1984 because (surprise , surprise) they cause cancer. They were the cleaning fluids for intaglio (or gravure) printing presses. For some strange reason they worked these machines with all the doors and windows wide open and NO SMOKING written everywhere. Always came out of that hall a little giddy, and I don't think it was the pint of Pedigree at lunchtime.

 

[trammayo]

I think Xylene turns to Phosgene if inhaled through a lighted cigarette. All nice stuff (I don't think).

Mick

 

[trammayo]

On the subject of worms - most buses (and trolleybuses - which were bus chassis derived - particularly AEC/BUT's) were all worm driven and on the principle of power and coast. It depends on the pitch and angle. Even so, for prolonged journeys on tow, it was always advisable to remove a half-shaft.

Mick

 

[pugwash]

I think Xylene turns to Phosgene if inhaled through a lighted cigarette. All nice stuff (I don't think).

Mick

I think astounding ignition is more likely!

 

[Spule 4]

Xylene and toluene are not on any of the carcinogen lists worldwide. A quick check on Google.co.uk shows severl vendors selling both.

If xylene turned into phosgene when burned, we would be in a world of hurt, it is an ingredient in gasoline in many parts of the world.

 

[trammayo]

Hi Garrett - I might be a little mixed up (being a non-smoker) but there us a link between Xylene and Phosgene in the production of the latter - at least that is what I was told some 45 years ago!
I worked for English Electric who used Xylene by the barrel load as a solvent for impregnating varnish at least. Maybe workers were scared into not smoking just in case they blew themselves up?

It does make an excellent paint brush cleaner!

Mick

 

[pugwash]

Xylene and toluene are not on any of the carcinogen lists worldwide. A quick check on Google.co.uk shows severl vendors selling both.

If xylene turned into phosgene when burned, we would be in a world of hurt, it is an ingredient in gasoline in many parts of the world.

Well call me mister ol' stupido, but they were banned back in the eighties in Britain when I was working in the printing industry that used them as solvents for gravure printing inks. If that has has subsequently been reversed I don't know, but I can tell you those were some seriously toxic fumes.
And we do live in a world of hurt. Sadly. Apart from on this forum, where we seem to live in a world of mates :love:

 

[Spule 4]

Better living through chemistry!

Here in the US, I have seen Methylene Chloride/Dichloromethane were used in printing for cleaning, now replaced with Alcohols. And if you do burn it, it will produce phosgene (any fluorinated hydrocarbon actually). I have personally not seen toluene or xylene used by printers for cleaning, but there was a fatality about an hour west of here this past week at a printing company involving toluene.

MC is strongly regulated here in the US. I once had to assist at a worksite involving a fatality with the stuff. MC impacts the central nervous system and a co-worker had to deal with another fatality involving the stuff where they took a can of it into the restroom, you can figure out the rest.

...and MC was used in some plastic model glues in the US, it is good at melting plastic!