Author Topic: Maudslay Marine Steam Engine  (Read 5664 times)

Offline gbritnell

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Maudslay Marine Steam Engine
« on: February 08, 2019, 04:56:33 PM »
While deciding how to approach the build of the Galion road grader I needed something to keep myself busy so I went through all the stored drawings and settled on the engine that our good friend Chuck Fellows designed.
Always wanting to do something a little different I scaled the drawings by .70. This allowed for the smallest screws to be threaded M1.2 x .25, for which I have taps and a die.
I had some brass available but had to order more for the decorative standards. Other than the scale factor I'm building it per the plans.
Here's where I am so far.
Talent unshared is talent wasted.

Offline 10KPete

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Re: Maudslay Marine Steam Engine
« Reply #1 on: February 08, 2019, 07:42:01 PM »
There's that huge penny again! Where do you find those???  :lolb:

 :popcorn: :popcorn:

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

Offline crueby

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Re: Maudslay Marine Steam Engine
« Reply #2 on: February 08, 2019, 07:52:28 PM »
Lots of progress on a lot of parts! Thats going to be a beauty!
 :popcorn: :popcorn: :popcorn:

Offline Admiral_dk

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Re: Maudslay Marine Steam Engine
« Reply #3 on: February 08, 2019, 08:32:45 PM »
The parts look absolutely stunning  :praise2:

.... but I'm certainly glad I'm not the one tapping M1.2  :o .... yes I know you have done this before, but these small sizes would make me extremely nervous ....

Offline Don1966

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Re: Maudslay Marine Steam Engine
« Reply #4 on: February 08, 2019, 09:43:31 PM »
George any project you build is stunning to say the least and looking forward to more updates..... :ThumbsUp:


 :cheers:
Don

Offline steamer

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Re: Maudslay Marine Steam Engine
« Reply #5 on: February 08, 2019, 09:48:39 PM »
Looks great George...I'm sure Chuck approves!

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Online Dave Otto

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Re: Maudslay Marine Steam Engine
« Reply #6 on: February 08, 2019, 11:19:20 PM »
Very nice looking assortment of parts George.
Like all your projects, it is bound to be a showpiece.

Dave

Offline Ye-Ole Steam Dude

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Re: Maudslay Marine Steam Engine
« Reply #7 on: February 08, 2019, 11:23:33 PM »
Hello George,

This is going to be a classic, a design by Chuck and built by George. It is a pure pleasure to be able to follow this thread. :popcorn: :popcorn: :popcorn: :popcorn:

Have a great day,
Thomas

Online b.lindsey

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Re: Maudslay Marine Steam Engine
« Reply #8 on: February 09, 2019, 12:36:48 AM »
I am looking forward to it as well George, I just love your affinity for small scale engines  :ThumbsUp:

Bill

Online Craig DeShong

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Re: Maudslay Marine Steam Engine
« Reply #9 on: February 09, 2019, 09:40:26 PM »
There's that huge penny again! Where do you find those???  :lolb:

 :popcorn: :popcorn:

Pete

I'm with you Pete, George has a penny the size of a dinner plate and he's just fooling us all.  :lolb:

Really George, your work continues to amaze me !
Craig

Online Art K

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Re: Maudslay Marine Steam Engine
« Reply #10 on: February 09, 2019, 10:39:37 PM »
George,
Looks like you already have a good start. I will be following along.
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King

Offline Ramon

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Re: Maudslay Marine Steam Engine
« Reply #11 on: February 09, 2019, 11:35:19 PM »
Ooh! those parts look really nice George - like Don 1066's 'brass masterpieces' that's going to be another smaller but gem like engine for us to take delight in   :praise2:

Looking forwards to seeing this develop  :ThumbsUp:

Regards - Tug
"I ain't here for the long time but I am here for a good time"
(a very apt phrase - thanks to a well meaning MEM friend)

Offline jeff l

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Re: Maudslay Marine Steam Engine
« Reply #12 on: February 10, 2019, 03:17:05 AM »
outstanding as always !

Offline Johnmcc69

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Re: Maudslay Marine Steam Engine
« Reply #13 on: February 10, 2019, 04:42:29 AM »
 :ThumbsUp: :popcorn:
 Looking forward to this being built George, really nice work! Chuck will be proud.

 John

Offline gbritnell

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Re: Maudslay Marine Steam Engine
« Reply #14 on: February 10, 2019, 01:58:14 PM »
For those of you that didn't follow Chuck's build this engine is an oscillator that has the cylinder pivoting on a central shaft. The valve mechanism is in an adjacent bore. When the cylinder rocks back and forth this would cause the valve mechanism to rotate in a circular path equal to the radius from the center of the pivot shaft. To compensate the valve shaft is tied to the base of the engine with a linkage which allows it move with the oscillations but stay in a fixed position, rotation wise. The valve body on the bottom of the cylinder has the porting which is naturally moving as the cylinder oscillates but being as the valve is stationary this allows the porting to allow steam/air to go from one end of the cylinder to the other (double acting).
Yesterday I machined both of the valve shafts, the pivoting shaft that the cylinder rotates on and the actual valve shaft.
The pivoting shaft wasn't a big deal, turning, threading and drilling some porting but the valve shaft has slotting to create the port paths. The full sized drawing calls out the porting channels as .062 wide x  .075 deep which multiplied by .70 equals .043 x .053 deep. I turned the shaft leaving it on the end of the rod then mounted it in my dividing head. I center drilled (#0) then drilled each corner position with a #57 drill (.043) then mounted a .032 end mill into the spindle. My mill will only spin 2500 rpm so the feed rate was very slow and precise. I cut the initial path at .04 depth then went to .053 and made a second pass. That being finished I offset all the positions by .0055 and made another pass to get the .043 width.
No end mills were harmed in the production of this part!
Talent unshared is talent wasted.