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Oil Field Engines & Related Equipment

Building a FM 118 crankshaft?


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  #41  
Old 11-06-2013, 09:07:21 AM
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Default Re: Building a FM 118 crankshaft?

May be a little off topic but right on center. I'll start another thread about that subject in smoke and flames but Elden you couldn't be more right.
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  #42  
Old 11-06-2013, 07:58:32 PM
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Default Re: Building a FM 118 crankshaft?

Finally talked to my welder friend and he have me some info on pre and post heating. He said preheat wasn't all that important but some would be good to get the moisture out of everything. Also need to get the core up to temp so the preheat needs to be slow. After welding to keep hydrogen from forming and cracking the welds he said to hold it in the furnace for a while then put it in the sand to cool down.

---------- Post added at 05:53 PM ---------- Previous post was at 05:50 PM ----------

I did a little home work on hydrogen and found it dissipates 1" in 48 hrs at room temp and 1" in 1hr at 450. So I can see the value in keeping the heat on it for a while after the welding.

---------- Post added at 05:56 PM ---------- Previous post was at 05:53 PM ----------

And yes, I don't fully understand all this but I'm learning.

---------- Post added at 05:58 PM ---------- Previous post was at 05:56 PM ----------

Here's the read on hydrogen cracking.

http://content.lincolnelectric.com/p...ldcracking.pdf
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  #43  
Old 11-06-2013, 08:19:22 PM
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Default Re: Building a FM 118 crankshaft?

The crank in my O'l Harley is 5 seperate pieces, 3 seperate shafts, and 2 balance wheels with taper / keyed fit held together with a nut torgued to specs. Very interesting what you are trying to do here Reed, looking forward to seeing the detail of your project.


Jim
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Old 11-06-2013, 08:56:00 PM
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Default Re: Building a FM 118 crankshaft?

Thought about doing mine with tapers as well. I'm sticking with what I've decided.
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Old 11-06-2013, 11:45:10 PM
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Default Re: Building a FM 118 crankshaft?

Here is a link to a post of a crank I made a few years ago.
http://www.smokstak.com/forum/showthread.php?t=57033
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  #46  
Old 11-07-2013, 09:28:07 AM
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Default Re: Building a FM 118 crankshaft?

Excellent! If my approach doesn't work I'm going to try one using that same method. I won't have to leave those tabs on the end to do the throw though as I have an offset fixture.

---------- Post added at 07:28 AM ---------- Previous post was at 07:19 AM ----------

The tabs were a good idea though.
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Old 11-07-2013, 11:56:36 AM
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Default Re: Building a FM 118 crankshaft?

Just got a picture of the journals

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Old 11-07-2013, 03:57:21 PM
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Default Re: Building a FM 118 crankshaft?

How about a picture of your offset fixture? For the Idea closet.
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Old 11-07-2013, 05:19:50 PM
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Default Re: Building a FM 118 crankshaft?



---------- Post added at 03:14 PM ---------- Previous post was at 03:12 PM ----------



---------- Post added at 03:19 PM ---------- Previous post was at 03:14 PM ----------

The throw goes in between the shafting (pinch fit), that way the crank isn't flexed when chucked and centered.
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Old 02-17-2014, 05:58:12 PM
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Default Re: Building a FM 118 crankshaft?

Well??? The holidays are over. Did it work? Pictures? Curious minds want to know!
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Old 02-17-2014, 07:53:00 PM
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Default Re: Building a FM 118 crankshaft?

Back burnered for now. Sometimes work gets in the way of fun.
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Old 02-17-2014, 09:38:39 PM
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Default Re: Building a FM 118 crankshaft?

I understand - I also have a day job, which I need for gas, groceries, and hobbies.
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