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71
Tooling & Machines / Re: Outfitting the Levin.
« Last post by b.lindsey on February 17, 2019, 05:16:13 PM »
Well I would give her a nice new paint job (says he who isn't painting his shop) but I figure you may want the original paint for posterity's sake. :lolb:

Bill

72
From Plans / Re: Bruce Macbeth Engine, European Version
« Last post by crueby on February 17, 2019, 05:06:27 PM »
Excellent! Always goes much better with proper heat.
 :popcorn: :popcorn: :popcorn:
73
From Kits/Castings / Re: A Wallaby of my own.
« Last post by steamer on February 17, 2019, 05:03:19 PM »
Starting to look like a real engine now  :whoohoo:

Bill

Man I hope so... I just want her to run...even once.

Dave
74
Your Own Design / Re: 20 cc Horizontal 2 Stroke Diesel
« Last post by Roger B on February 17, 2019, 05:02:48 PM »
Thank you Per  :ThumbsUp: As ever more to learn  :headscratch:

When I drew the thinned down version of the current head the combustion  chamber was looking rather pancake like so I decided on a 8mm bore 8mm deep version. The bumping clearance was a little large, I have been aiming for ~0.5mm, so I had to skim 0.2 mm off the face. I then stared thinking about the clearance volume between the piston and the head  :thinking: 0.5 mm is not much but it is a reasonable area. A quick calculation gave a volume of 0.25cc, a significant amount compared to the combustion chamber  :facepalm:
Recalculating gave the (using the swept volume after the exhaust port closes, 15cc) original compression ratio as 16-1, the next step as 20-1 and the new head as 24-1. This is more in line with the measured compression pressures. With the new head and cranking at around 2000rpm I was getting nearly 40 bar  :)
I now need to make a new 0.35mm nozzle and wait for the R+D department to be open for the next trials.
75
Tooling & Machines / Re: Outfitting the Levin.
« Last post by steamer on February 17, 2019, 04:56:54 PM »
Though it does state, that in the early years, nearly ALL of levin's production went to the government for war production.....Lucy needs an American flag on her base somewhere I think....I'll work on that.

Dave
76
Tooling & Machines / Re: Outfitting the Levin.
« Last post by steamer on February 17, 2019, 04:48:18 PM »
Yup  I remember reading up on that.   I don't think this lathe spent a lot of time running anything.  but I could be wrong.   It's just not worn at all...

I'd like to think it helped win the war, but I think that is at best wishful thinking...

Dave
77
Tooling & Machines / Re: Outfitting the Levin.
« Last post by b.lindsey on February 17, 2019, 04:44:05 PM »
Interesting. I did a bit of googling too on Levin Lathe History and came up with this: http://levinlathe.com/history/page4.html. An interesting bit of history of the company if you read the other pages also. Seems that one of the main things they did was to make sapphire jewel bearings which had been sourced from Switzerland and the US Govt. was concerned that the supply chain might be cut off by the war. I suppose these were not only for horological purposes but perhaps other war effort instrumentation such as bomb sights, etc. Just guessing on that though. I think it's fun to know some of the background of these old machines and it would indeed be nice if they could talk!!

Bill
78
Tooling & Machines / Re: Outfitting the Levin.
« Last post by steamer on February 17, 2019, 04:24:58 PM »
Heres a typical War Board tag on a machine tool from the period.   My lathe has no such tag...but Levin only painted these lathes during this time

https://www.flickr.com/photos/mikegeiger/27727834236/

Dave
79
From Plans / Re: Bruce Macbeth Engine, European Version
« Last post by Don1966 on February 17, 2019, 04:20:27 PM »
Awesome Achim glad to hear!..,. :ThumbsUp:


 :cheers:
Don
80
Tooling & Machines / Re: Outfitting the Levin.
« Last post by steamer on February 17, 2019, 04:19:33 PM »
Dave, when you say war lathe are you referring to just the period of manufacture or were these actually used in the war effort and if so in what ways given their small size. Just curious.

Bill

Yes,,, During the war, critical material was rationed carefully  Chrome was one of those materials.   So instead of chroming the lathe, they painted it.    Hence my term 'War" lathe.

the paint is original...As to its use during the war?    I have no idea.   I always wished that old machines could talk.

This is a early Levin,    If you look at some of the out of the way parts of the bed, you can see casting problems.  Levin told me that the early lathes had casting issues, and although accurate, weren't necessarily very pretty in places.   Who ever scraped mine in knew what they were doing.  It's dead aligned with the TS, but at the bottom of the center T slot on the TS end, you can see some casting inclusion/blow holes....Not something I think would have gotten through in later years.   Its got character.

Dave


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