Author Topic: Travis Steam Engine 2 X Size  (Read 5522 times)

Offline toolznthings

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Travis Steam Engine 2 X Size
« on: March 01, 2019, 06:47:38 PM »
Starting a new build thanks to Thomas ( Ye-Ole Steam Dude ) for sharing his nice set of plans for the engine he designed. A couple of private messages back and forth with Thomas and he agreed a double size build
would work out. This will be posted as I progress through the build.

Going to start with the crankshaft which will be probably the most difficult part to make. Leaving the output ends long, the crank will be 16.5 inches long. In keeping with the style of the engine I decided on a metric
size ball bearing for the crank to run on. It's overall size is compact compared to a inch size bearing. I'm using a 6003-2Z bearing. McMaster Carr # 6661K16.

Fastener sizes will be chosen as I go forward.

The for throws for the crank are 1.000" thick x 1.500" wide and 2.000" in diameter on the rounded end. The main shafts are .750 diameter at the throws and .625 diameter at the output ends. The connecting rod journals are .500" diameter. A diameter is turned for a slip fit for 17 mm bearing I.D.


Extra attention to sizing the throws was done by surfacing grinding the thickness and width after rough milling from a finish turned 2.000 diameter making four blanks. The extra effort will be apparent as I begin addition machining.

The blanks with the CAD layout of the crankshaft.
Setup in the mill for drilling, spot drill first opp.

 
Thanks for the visit !
Brian

Offline Johnmcc69

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Re: Travis Steam Engine 2 X Size
« Reply #1 on: March 01, 2019, 07:33:24 PM »
Wow! That's going to be a big model! Great work so far!

 Sign me up for the ride....
 :popcorn:

 John

Offline Ye-Ole Steam Dude

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Re: Travis Steam Engine 2 X Size
« Reply #2 on: March 01, 2019, 10:53:53 PM »
Hello Brian,

I am so pleased to see the first parts being machined, it goes without saying that I will be following this build all the way. Sure hope that you document each step along the way and share plenty of photos with all of us. Let me know if I can help in any way, either PM or direct email.

I am excited to see this project underway :cartwheel:

Have a great day,
Thomas

Offline yogi

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Re: Travis Steam Engine 2 X Size
« Reply #3 on: March 01, 2019, 11:15:04 PM »
Very cool Brian!
Iím looking forward to see the progress.  :popcorn: :popcorn: :popcorn:

Offline toolznthings

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Re: Travis Steam Engine 2 X Size
« Reply #4 on: March 02, 2019, 02:43:44 AM »
Hello Brian,

I am so pleased to see the first parts being machined, it goes without saying that I will be following this build all the way. Sure hope that you document each step along the way and share plenty of photos with all of us. Let me know if I can help in any way, either PM or direct email.

I am excited to see this project underway :cartwheel:

Have a great day,
Thomas

Thanks Thomas !  And others !  :)
Thanks for the visit !
Brian

Offline crueby

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Re: Travis Steam Engine 2 X Size
« Reply #5 on: March 02, 2019, 02:57:46 AM »
Those are impressive specs!  Do you have a pic or drawing of what it will look like?


 :popcorn: :popcorn: :popcorn:

Offline toolznthings

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Re: Travis Steam Engine 2 X Size
« Reply #6 on: March 02, 2019, 05:03:45 AM »
Search for " Travis Steam Engine " Thomas has a build on his YouTube channel. Just think twice the size.  :)
Thanks for the visit !
Brian

Offline b.lindsey

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Re: Travis Steam Engine 2 X Size
« Reply #7 on: March 02, 2019, 02:21:56 PM »
This one will be quite a beast at 2x scale. Should be a great project though.

Bill

Offline toolznthings

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Re: Travis Steam Engine 2 X Size
« Reply #8 on: March 04, 2019, 05:48:41 PM »
More work on the crankshaft ...........

A note on the initial setup for the crank throws. I used a dial indicator in the mill spindle and swept the width of the blanks to find dead center. All the blocks are exactly the same width, 1.500 "

After spot drilling all the blanks I rough drilled for the crank pin bores and the output ends. I like to chamfer the the bores after drilling to plus size of the finished bore before the boring operation. This prevents a burr from being rolled into the finished hole if chamfered last.

Setup the boring head and bored the .750" and .500" bores to close slip fit for the shafts. The rod journals will be ground 12L14 rod .500 in diameter and one piece .750" in diameter for the center link.

The crank ends will be turned from 7/8" diameter 12L14 stock. Three diameters in one setup, .750", 17mm for the bearing and .625" at the ends.

First attempt at the lathe starting with .750" ground stock in the collet did not produce a shaft true enough and I went with the 7/8" stock to turn all the diameters.

Last picture showing a dry fit assembly of the parts.
 
Thanks for the visit !
Brian

Online bent

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Re: Travis Steam Engine 2 X Size
« Reply #9 on: March 04, 2019, 06:45:49 PM »
Cool!  Will be following with interest  :popcorn:

Offline Ye-Ole Steam Dude

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Re: Travis Steam Engine 2 X Size
« Reply #10 on: March 04, 2019, 08:03:19 PM »
Hello Brian,

Beautiful work on the crank, are you going to make it 180 degree or a 90 degree?

Have a great day,
Thomas

Offline b.lindsey

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Re: Travis Steam Engine 2 X Size
« Reply #11 on: March 04, 2019, 10:03:10 PM »
Nice progress already Brian.  :ThumbsUp:

Bill

Offline toolznthings

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Re: Travis Steam Engine 2 X Size
« Reply #12 on: March 05, 2019, 02:22:19 AM »
Hello Brian,

Beautiful work on the crank, are you going to make it 180 degree or a 90 degree?

Have a great day,
Thomas

Hi Thomas,
Keeping the crank like the drawing, 180 degrees. Trying to stay true to the design as possible.
Thanks for the visit !
Brian

Offline Jim Abood

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Re: Travis Steam Engine 2 X Size
« Reply #13 on: March 07, 2019, 12:19:55 AM »
Hi Brian
You always do incredible work.   I am looking forward to seeing more  pics of the build.
Jim

Offline toolznthings

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Re: Travis Steam Engine 2 X Size
« Reply #14 on: March 07, 2019, 01:06:41 AM »
Thanks Jim ! Welcome to the forum  :hi:
Thanks for the visit !
Brian