Author Topic: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine  (Read 27539 times)

Offline Don1966

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #60 on: February 10, 2016, 12:14:51 AM »
Awesome Stan and congrats on the runner. I knew you were at it and glad to see it running. I'll be waiting for the finally............I...........like............ :Love:


Don

Offline b.lindsey

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #61 on: February 10, 2016, 12:20:45 AM »
She's a beauty Stan. Yeah, I have been wondering what you were up to as well....now we know :) Love the slow motion too!!

Bill

Offline Tennessee Whiskey

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #62 on: February 10, 2016, 12:27:41 AM »
And I thought you were just doing the South American show circuit  :lolb:. Great job Vern.

Cletus

Online Dave Otto

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #63 on: February 10, 2016, 01:52:16 AM »
Very nice Stan!

OK the vacation is over now it's time to catch up on your build logs.

Dave

Offline sshire

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #64 on: February 10, 2016, 02:47:35 AM »
Thanks! The build logs will appear shortly.
This engine is, in terms of the precision of the parts, difficult.
The entire valve linkage mechanism (which I'm pretty sure was designed while quaffing multiple libations) goes like this: eccentric moves eccentric strap, which moves the slotted link on vertical, parallel rods. A piece which rides in the link slot, is connected to a rod which rotates and moves the valve link up and down. This link, which has a round end which fits into a slot on a part at the end of a threaded rod which is connected to the D valve in the steam chest.
You'll see.
Best,
Stan

Offline sshire

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #65 on: February 10, 2016, 04:50:01 AM »
Lady Godiva Rides Again - Episode 4
Roy Ozouf’s Coventry Engine


Crankshaft


12L14 was used for this built-up crankshaft. The first op, after turning to diameter and parting to length, was milling keyways on each end of the shaft. Not quite sure why both ends have a keyway, as there is only one flywheel, but I’m just following the drawings.



Now, some layout for the cheeks. Note the exquisite, Cletus-made and hardened, punch.





Drilling and reaming followed



Locating pins were turned for the rotary table



Then, the ends were rounded.



And, connected



A visit to Oliver was next to remove offending machining marks.



Next up is the cheek spacer



Obligatory ˝” micrometer shot



Checking all dimensions carefully.



The two spacers. These are to give a heavier look to the crankshaft.





Everything fitted in position.



The side frames were aligned with dowel pins for drilling and line boring for the pivot shaft bearings







Now, the holes for the crank bearings.



With that completed, I returned to the crankshaft. It’s held together with 4/0 taper pins and Loctite. The taper reamer is sized for the 4/0 pins.





After allowing the Loctite to cure overnight, the center was milled away.



After filing, another part is completed.



The crankshaft bearings were turned from bronze,





Next up: The cylinder.

Stay tuned.





Best,
Stan

Offline vcutajar

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #66 on: February 10, 2016, 05:31:41 AM »
That's an awesome runner Stan.  Congratulations.

Vince

Offline Jasonb

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #67 on: February 10, 2016, 08:06:04 AM »
Very nice Stan and I see you have adopted my tactic of making the engine then writing about it.

Thanks also for the slow motion as it allows the valve linkages to be seen in action.

I'd take a guess that the other keyway is there if you wanted to add a drive pully

J

Offline sshire

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #68 on: February 10, 2016, 02:01:36 PM »
Thanks for the comments. Much appreciated.
Jason
About the drive pulley. I'm completely out of sewing machines. :ROFL:
Best,
Stan

Offline Jasonb

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #69 on: February 10, 2016, 02:43:08 PM »
You have just got time to construct an ice cream maker ready for the comming show season ;) There was a guy in Australia who was casting some up at a suitable scale over on HMEM.

Offline sshire

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #70 on: February 10, 2016, 03:53:44 PM »
Lady Godiva Rides Again - Episode 5
Roy Ozouf’s Coventry Engine


Cylinder



I have a nice piece of 2”” Durabar cast iron. I got this from PhilJoe, who got the drop at at the Durabar facility near him. If you’re not familiar with this, here’s something from their website.

Dura-Bar is an engineered iron that offers machining advantages over carbon and alloy steel as well as other continuous cast iron bars.
Dura-Bar is a highly machinable material. Continuous casting produces a product superior to castings made from the static casting method. The iron bars produced by the continuous cast method have a fine-grained, dense, as-cast structure. Since the bar is pulled from the bottom of the holding crucible, dross, slag and other impurities float to the top, away from the opening of the die - allowing for fewer defects and improved productivity.


The recessed curves were done with the Serepton Radius Tool. This was before I had gotten the Holdridge Radius Cutter from the used tool guy at the Vermont show. The Serepton is OK but not even in the same league as the Holdridge.



Then, step drilling and boring. I drilled until I could fit my thickest boring bar.





Then, to the Bridgeport to Flexhone the bore. I had two 1” Flexhones: 120 and 240 grits.
Lovely finish.



I needed to complete the pivot shaft since it must be in place to drill the cylinder intake and exhaust ports.
There is a through hole used for indexing. With a dowel pin in the hole, I indexed the part to zero in the spin indexer. This was done so that other holes could be drilled at required angles.



With that completed, the pivot shaft was affixed to the Pivot block which was affixed to the bottom cylinder cover. That assembly was bolted to the cylinder.

The Pivot shaft was positioned on a pair of 1-2-3 blocks in the vise. This ensures that the milled flat is parallel to the pivot shaft.



A test fit of the piece which will be the port block.



The port block, with holes and layout. This block was later remade based on KVOM’s drawing.



Then, the steam chest.



Corners rounded and complete.





Back to the Durabar for the cylinder top cover.









Another part finished



After parting the cover, it was reversed and held in a 5C collet to machine the rear boss.



Family photo



Piston

A simple turning. The piston has a centered recess for the taper pin which attaches it to the piston rod.



When I got close, much test fitting until I had a slightly tight sliding fit. Then, various grits of TimeSaver for the final fit.



Flats milled on the piston rod for adjustment.



Centered on the mill for drilling and reaming the taper pin through hole.





Next time: The Crosshead and Eccentric

Y’all come back.





Best,
Stan

Offline Tennessee Whiskey

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #71 on: February 10, 2016, 04:33:54 PM »
The quality of the operations are only exceeded by the outstanding documentation  :ThumbsUp: :ThumbsUp: Vern.

Cletus

Offline sshire

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #72 on: February 10, 2016, 04:43:34 PM »
Thank you Cuz
Why not bring in the 2nd string grill guy for a few days and see it in person at NAMES? :LittleDevil:
Best,
Stan

Offline fumopuc

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #73 on: February 10, 2016, 08:10:11 PM »
Hi Stan, congratulations a nice runner. I do like the slow motion very much.
« Last Edit: February 11, 2016, 07:42:22 AM by fumopuc »
Kind Regards
Achim

Offline kvom

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Re: Lady Godiva Rides Again - Roy Ozouf's Coventry Engine
« Reply #74 on: February 10, 2016, 08:47:54 PM »
Thank you Cuz
Why not bring in the 2nd string grill guy for a few days and see it in person at NAMES? :LittleDevil:

That assumes Cletus is the #1 grill guy.  :mischief:  Still a good suggestion either way.  I might even give him a ride on my way.