Author Topic: Maudslay Marine Engine  (Read 14421 times)

Offline b.lindsey

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Re: Maudslay Marine Engine
« Reply #165 on: July 31, 2018, 09:27:26 PM »
Fantastic Chuck. Such an elegant design too.... love it!!!

Bill

Offline Tennessee Whiskey

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Re: Maudslay Marine Engine
« Reply #166 on: July 31, 2018, 11:17:43 PM »
There only word I can think of is “elegant “   I know I’ve used it before, but, I really mean it

Whiskey

Offline steamer

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Re: Maudslay Marine Engine
« Reply #167 on: August 01, 2018, 12:53:39 AM »
Another great build shaping up Chuck!.....Can't wait for the first start!

Dave
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Damned ijjit!

Offline cfellows

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Re: Maudslay Marine Engine
« Reply #168 on: August 04, 2018, 03:49:40 AM »
Thank you, Gents.

Here's a picture of the valve actuating parts.  The larger piece is an arm that will attached to the end of the rotary valve and the smaller piece is a link which will connect the arm to an anchor screwed to the base.  I've determined that the cylinder motion provides enough rotation on the rotary valve that I won't require an eccentric.



These little parts are made a lot easier with CNC.  I designed them in Visio and cut them out of a larger, captive piece of brass.  Then they were separated from the captive piece by milling off the back side.  Piece of cake.  I've also cut the anchor piece but need to do a bit more shaping on it.  Next I'm going to remake the rotary valve so the exhaust  will be routed back into the cylinder pivot rod where it could be plumbed away from the engine, as suggested by Tug.
So many projects, so little time...

Offline cfellows

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Re: Maudslay Marine Engine
« Reply #169 on: August 04, 2018, 11:15:55 PM »
I've pretty much finished up the valve linkage parts.  Spent this afternoon working on a new rotary valve.  I'm getting ready for my 4th attempt.  Can't believe the silly mistakes I'm making...
So many projects, so little time...

Offline b.lindsey

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Re: Maudslay Marine Engine
« Reply #170 on: August 04, 2018, 11:20:07 PM »
Third fourth time is the charm as they say Chuck.

Bill

Offline cfellows

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Re: Maudslay Marine Engine
« Reply #171 on: August 05, 2018, 01:04:06 AM »
Third fourth time is the charm as they say Chuck.

Bill

Yeah, it would seem so.  Some daye it just takes me a few tries to get my Sh*t together. 

Finally got the overall shape and size of the valve cut.  The material is stainless steel, probably 304 as tough as it is to machine. 





I haven't parted the valve off from the parent rod yet as I still have some machining to do in the mill.  Here's the parts more or less assembled...





Gonna stop for the day.  Tomorrow I'll finish milling the inlet and exhaust passages in the valve and part it off.  Then I'll start thinking about drilling the inlet and exhaust passages that connect the valve chamber to the pivot rod in the lower cylinder block.  These holes are blind and will have to be drilled from the outside, then plugged.  The alternative might be to mill slots in from the bottom, then close them off with a soldered-in recessed plate....
So many projects, so little time...

Offline zeeprogrammer

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Re: Maudslay Marine Engine
« Reply #172 on: August 05, 2018, 01:52:06 AM »
Some daye it just takes me a few tries to get my Sh*t together. 

Regardless...perseverance and all that. It's looking great!  :ThumbsUp:
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: Maudslay Marine Engine
« Reply #173 on: August 05, 2018, 02:09:10 AM »
It sure is!!  And a rather unique mechanism as well. Very nice Chuck.

Bill

Offline cfellows

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Re: Maudslay Marine Engine
« Reply #174 on: August 05, 2018, 10:00:38 PM »
This morning I drilled the inlet and exhaust passages in the lower cylinder block.



The right one is the inlet and the left is the exhaust.  Both holes are drilled all the way into the cylinder pivot hole.  The cylinder pivot rod will have inlet and exhaust ports that line up with the holes in the cylinder block.

I've also milled the connecting slots in the rotary valve and parted it off from the parent material.





I think now I'm ready to reassemble the engine and check out the valve movement and timing.  I also need to move forward with drilling and porting the cylinder pivot rod.

So many projects, so little time...

Offline Ye-Ole Steam Dude

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Re: Maudslay Marine Engine
« Reply #175 on: August 05, 2018, 10:03:25 PM »
Coming together very nicely Chuck.

Have a great day,
Thomas

Offline crueby

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Re: Maudslay Marine Engine
« Reply #176 on: August 05, 2018, 10:24:27 PM »
Quite a neat valve, looking great!


 :popcorn:

Offline Ramon

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Re: Maudslay Marine Engine
« Reply #177 on: August 05, 2018, 10:41:21 PM »
All looking very promising Chuck  :ThumbsUp:

I like the way you have been able to do away with the eccentric and I hope you get all that porting in without those initial fears of it leaking.

Keep it coming - it's going to be a real nice display piece for sure :)

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 cfellows

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Re: Maudslay Marine Engine
« Reply #178 on: August 07, 2018, 03:07:51 AM »
I'm stoked!   I'll have this engine running in a couple of days, maybe tomorrow!  I finished all the valving and linkages.  The only thing left is the plumbing from the valve chest to the top end of the cylinder.  And... wait for it... I tested the engine and it runs, quite nicely, on just the bottom half of the cylinder.  With the plumbing installed for the top end it should run very well in double acting mode.
So many projects, so little time...

Offline crueby

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Re: Maudslay Marine Engine
« Reply #179 on: August 07, 2018, 03:17:44 AM »
Saweet!  Exciting stuff, looking forward to seeing it go!   :popcorn: