Author Topic: 1867 Otto and Langen Free Piston Engine  (Read 30574 times)

Offline Dave Otto

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1867 Otto and Langen Free Piston Engine
« on: March 05, 2016, 02:14:18 AM »
Hi Everyone

My very good friend Max having just completed a Breman walking beam hot air engine (beautiful engine by the way) was looking for a new project. I had loaned him my Leanz plans many years ago and he had always thought about building the engine; except there was always a casting kit calling his name. Max has built many beautiful running engines over the years both IC and hot air. Complex engines like the Mery, Callahan Cam stopper, Olds gearless, etc. It doesnít matter which engine it is; it will run like a Swiss watch when he is finished with it. The Callahan was his first model BTW.

Max and I have been friends for many years and have traveled around SW Idaho together showing hit & miss engines, models, and hot air fans at the local engine shows. We also setup together for a number of years at the original GEARS show in Portland Oregon.

He finally decided to tackle the Otto and at 80 years; he is thinking what have I got myself into? He was thinking if I can successfully complete the column the rest of the engine should be pretty easy; at least smaller anyway. :lolb:

Max is not much on internet forums, and the ins and outs of posting pictures; but he did express the desire to share his work on this engine. I jumped at the chance to help out and do the easy work for him. He gets the hard job of keeping all the complex radii, facets, raised panels, etc. straight in his head.

So if there is interest this is going to be a team effort.


A piece of 12L14 four inches in diameter and approximately a foot long was ordered and mounted in the lathe to get the project rolling. Here it has been roughed out and in this photo the steady rest has been added, then the bore drilled and bored using a ĺĒ solid carbide boring bar supplied by a friend.



Next the column is further roughed down in the area where the flutes will be machined and the radius roughed in at the lower end.


The work piece was removed and flipped around and the chucking lug removed. Then using the same boring bar the counter bore for the cylinder head is machined.


Here is a shot of the counter bore after machining.


The next operation was to machine the taper of the column; this needs to be done by setting the tail stock over and running between centers. A custom catís head lathe dog was machined and fabricated to drive the work piece between centers.


Here is the final shot from today. The taper has been successfully machined; notice the safety wire holding the lathe dog to the chuck jaw. What else would you expect from a retired aircraft mechanic? Also notice the bull nose center on the tailstock end.
Max went into this with some reservation, but from what Iím seeing so far the column is going to be a success.

Thanks for checking in.
Max & Dave

« Last Edit: March 05, 2016, 02:17:43 AM by Dave Otto »

Offline Don1966

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #1 on: March 05, 2016, 02:57:35 AM »
Dave I will be following along on this build. This is a project I want to build eventually. I have to ask how did the boring bar work out and how many passes were need to get the bore concentric all the way? What type instrument did Max use to check the bore with and how accurate did it come out? One foot is a long haul to bore with a boring bar. By the way that's a nice start Max........ I..........like...........:ThumbsUp:

 8) Don

Offline 10KPete

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #2 on: March 05, 2016, 04:29:45 AM »
I like this approach Dave. It gives Max an 'outlet' for his efforts and gives us a great opportunity to learn and appreciate what Max
is doing.

I've learned a couple of things already!

Pete
Craftsman, Tinkerer, Curious Person.
Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline fumopuc

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #3 on: March 05, 2016, 05:56:56 AM »
Hi Dave, Max, very interesting to see that column taking shap out of this bar stock. I have printed the plans some weeks ago too and sometimes I am looking at it.
Kind Regards
Achim

Offline Jo

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #4 on: March 05, 2016, 07:44:31 AM »
8)

We were playing the patterns for our one of these engines yesterday, but the main pattern is not a foot long  :hellno:

Jo
Usus est optimum magister

Offline Jasonb

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #5 on: March 05, 2016, 07:49:44 AM »
And Jo being Jo now wants it longer!

Thanks for posting Dave it will be good to follow along

Offline zeeprogrammer

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #6 on: March 05, 2016, 12:30:49 PM »
 :popcorn:

Excellent pics and comments. The work is awesome.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline b.lindsey

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #7 on: March 05, 2016, 03:58:32 PM »
Many thanks for starting this thread Dave. I am looking forward to following Max's work, thanks to your help.

Bill

Offline Dave Otto

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #8 on: March 06, 2016, 04:18:40 PM »
Thanks for all the great support everyone; this is going to be fun!


Don; the bore is actually a little over 8 inches; when the part was turned around and the chucking lug removed, counter bore added the lower end of the bore was exposed. Max said that he used snap gages to check the size; but found out when he was able to measure the lower end of the bore there was some taper. He blames the lathe for this.  :lolb:

Definitely pushing the limits of that boring bar; but it appears that he got away with it.

The bore will get honed or lapped and the taper will be taken care of then.


Max is a registered member here "112235" hopefully we can get him to chime in a little?


Dave
« Last Edit: March 06, 2016, 08:48:57 PM by Dave Otto »

Offline scc

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #9 on: March 06, 2016, 08:10:23 PM »
Wonderful :ThumbsUp:             Terry

Offline vcutajar

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #10 on: March 06, 2016, 08:11:31 PM »
Pulled up a chair and will be eagerly following along.

Vince

Offline Flyboy Jim

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #11 on: March 07, 2016, 07:29:10 PM »
Dave,

Thanks for doing this thread. That's an impressive part!

For a newby like myself would you mind giving a little thumbnail sketch as to what this engine is all about? Maybe a link to more info.

Jim
Sherline 4400 Lathe
Sherline 5400 Mill
"You can do small things on big machines, but you can do small things on small machines".

Offline fumopuc

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #12 on: March 07, 2016, 07:43:09 PM »
Hi Jim, maybe this link will be helpfull.
http://www.modelenginemaker.com/index.php/topic,5692.0.html
Kind Regards
Achim

Offline Flyboy Jim

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #13 on: March 07, 2016, 08:15:35 PM »
Hi Jim, maybe this link will be helpfull.
http://www.modelenginemaker.com/index.php/topic,5692.0.html

That's great thanks. I didn't know quite what I was looking for.

I did a YouTube search and was able to find some videos. What a fascinating engine!

Jim
Sherline 4400 Lathe
Sherline 5400 Mill
"You can do small things on big machines, but you can do small things on small machines".

Offline Tennessee Whiskey

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Re: 1867 Otto and Langen Free Piston Engine
« Reply #14 on: March 08, 2016, 12:00:27 AM »
Well he definitely knows his way around the shed; does he like IPAs ? 8)

Cletus