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Author Topic: Gold Blend. A Coffee Jar Engine........  (Read 54063 times)

Offline Dean W

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #25 on: August 04, 2011, 07:04:56 PM »
It sure looks pretty, David.  Keep on with the cogitating!  : )

Dean
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Offline stirling lad

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #26 on: August 04, 2011, 10:10:35 PM »
Well, who better for a bit of the old cogitating, :scratch:
than an old codger :smart:

I'm sure you'll crack it soon mate,
you just need to focus....ummmm :med:ummmm.

cant wait to see what you decide??

 .....Mike...
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Offline Stilldrillin

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #27 on: August 10, 2011, 03:57:06 PM »
Well. It's been nearly a week now....... And, I'm only two crank discs further forward!  ::)

I really like the idea of a Ross Yoke.. Found all I could on Google, and set to with some paper, pencil, rule, calculator.  :thumbup:

After an hour or so of drawing lines and angles. (Sin op hyp, cos ad hyp, tan op adge). I realised I had totally lost the plot!  :bang:


Tried again today.  36mm between rods. Need 1" stroke..... Drew it all to scale x 2.. Or x 3.. Or x 4. I even cut out cardboard shapes.  :smart:

But, I don't think my dimensions are possible. I think I'm trying to change the laws of trigonometry!   :palm:


Unless, someone out there knows different...... Anyone got any ideas/ input?

David D
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Offline Bluechip

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #28 on: August 10, 2011, 05:25:10 PM »
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Offline Stilldrillin

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #29 on: August 10, 2011, 05:58:07 PM »
Thanks Dave.
I've been studying that for several weeks.........  :scratch:

The only part which makes sense........., We now consider the minimum and maximum displacements of the compression and expansion pistons. Notice that they respectively occur when the crank arm lines up with the yoke edge.   :smart:


After all the faffing about with me geometry set etc. I don't think it's possible to have a stroke of more than 18mm, at 36mm centres.

Unless........

David D
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Offline Bluechip

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #30 on: August 10, 2011, 06:11:23 PM »
Dave
There is a link from that site to an animation. Had a quick shufti at that ... ???

I think you may well be right.

Maybe that's why you don't see too many Ross Linkage engines .... :scratch:

The Rhombic is quite understandable ... by comparison.

I have both Rizzo books, but neither give any real insight ..

Doing an ordinary Stirling meself at the mo ... just out of all the scratty bits of metal I have ..

Being slung together on the fly ...  ::) was going to do some more this PM but felt off it.

Been to the Dentist this AM for two fillings ...

Cakehole inoperative ever since ... just got it going about 7PM  so I've been stuffing my face ever since, need to catch up on snap ..

Regards from a peckish ...

BC



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Offline Stilldrillin

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #31 on: August 12, 2011, 04:03:07 PM »
Well......

Had another go, with geometry set (99p Wilkinsons), squared paper, cardboard cut outs, imagination etc....  :smart:

Managed to prove one thing. I've totally lost any trigonometrical ability. Despite using it almost daily while working for a living!  :palm:

Sooo....... After all that waste of time, decided to build a conventional crank assembly!  ::)

Drilled the deck 5mm, and threw away 6off assorted/ useless, new, tin coated countersink bits. Before finding my old rose bit, from the 1960's.  :bang:

Consequently, not a lot of progress made, in a lot of (precious) time........  :bang:




The column's rather high at the mo. Better to shorten by an inch, than to extend.

The bearing sleeve, through the column, is 1/2" dia brass, and will have a pair of ballraces.

The discs are 2" dia. The thicker one will be the boss of the 5 or 6" dia flywheel.

No progress possible over the weekend.
But hope have the time, to come up with a means of holding a dozen balsa wood discs securely to an oscillating 4mm piece of silver steel........


Hope your gob's better now, Dave.......  :thumbup:

David D
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Offline Bluechip

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #32 on: August 12, 2011, 04:27:44 PM »
Quote from: Stilldrillin on August 12, 2011, 04:03:07 PM
Well......

Had another go, with geometry set (99p Wilkinsons), squared paper, cardboard cut outs, imagination etc....  :smart:

Managed to prove one thing. I've totally lost any trigonometrical ability. Despite using it almost daily while working for a living!  :palm:

Sooo....... After all that waste of time, decided to build a conventional crank assembly!  ::)

Drilled the deck 5mm, and threw away 6off assorted/ useless, new, tin coated countersink bits. Before finding my old rose bit, from the 1960's.  :bang:

Consequently, not a lot of progress made, in a lot of (precious) time........  :bang:




The column's rather high at the mo. Better to shorten by an inch, than to extend.

The bearing sleeve, through the column, is 1/2" dia brass, and will have a pair of ballraces.

The discs are 2" dia. The thicker one will be the boss of the 5 or 6" dia flywheel.

No progress possible over the weekend.
But hope have the time, to come up with a means of holding a dozen balsa wood discs securely to an oscillating 4mm piece of silver steel........


Hope your gob's better now, Dave.......  :thumbup:

David D

Ah, It's coming on. I'm sure it will be a runner  ...  :thumbup:

Recently refurbished gob is in splendid fettle ...

Just completed Full-Power acceptance trials on a bag of Pork Scratchings ....

One small discrepancy, I think he's used Metric fillings ... me gnashers no longer seem to fit BSF nuts ...

Bugger ...  :scratch:

BC
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Offline Stilldrillin

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #33 on: September 11, 2011, 05:54:44 PM »

Has it been a month since I posted/ did anything much? Sheesh!  :bugeye:

I've not had much shop time lately, and when I did, I could only manage around an hour at a time.....  ::)


I needed some 1mm+ slots. So bought a 1.2 x 50mm dia. slitting saw, then had to make an arbor to suit......




It works an all........




Been making most of the fiddly bits. These are rod ends......




Ball race big end, rings.........




Fitted ball race main bearings. Pushrods are 3/16" brass tube.

Have replaced the displacer steel disc, with a disc from a jam jar lid.......




All loosely pressed together. The piston just ducks back inside the cylinder, as the displacer arrives.......




I now need to find some way of holding the top displacer disc in place, without marking the shaft.
Also a 6" x 1/4" flywheel........



David D
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Rob.Wilson

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #34 on: September 11, 2011, 06:13:01 PM »
 :bugeye:  looking great David  :clap: :clap: :clap: :clap:

Very interesting build  :thumbup:


Rob
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Offline Dean W

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #35 on: September 11, 2011, 08:10:35 PM »
I like what you have going on, David.  Also, I see you have another LTD running in the back ground.
One for moral support.  : )
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Offline lazylathe

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #36 on: September 11, 2011, 08:20:21 PM »
Looks like it is all coming together now!!!

Can't wait to see this one running!!!

Andrew

PS: I wish my router was hot enough to run my Kontax Stilring engine...
It will run off the heat of my hand but my router stays at room temp...
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Offline NickG

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #37 on: September 12, 2011, 07:40:21 AM »
Yeah great work David, looks excellent! Can't wait to see the next one  :thumbup:
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Offline arnoldb

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #38 on: September 13, 2011, 07:37:11 AM »
That's looking just the job David  :clap: :clap:

I see you also end up with the make-a-tool-to-finish-the-project stuff  :coffee:

 :beer:, Arnold
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Offline Stilldrillin

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #39 on: September 13, 2011, 03:30:53 PM »
Thanks for your kind replies Chaps! Much appreciated.  :thumbup:

Managed a little shop time today....... One more (little) step along the way...  ::)

I needed a lightweight means of discretely holding a dozen balsa wood discs in place, on a 4mm dia shaft. But not causing any extra dead space in the chamber.

Turned an alloy top hat bush,......




Thinned flange to 1.5mm......




Found it was very easy to produce the recess with a sharp 8mm endmill. Plunged, to rough out. Then manoeuvred the wood around to finish neatly.

There's no pic of neatly........




Held in place with a spot of loctite. One more little step sorted........




Temporary flywheel, next.  :scratch:

David D

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Offline Stilldrillin

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #40 on: September 16, 2011, 12:19:36 PM »
What to do for a flywheel, had me scratching me head......  :scratch:
Don't want to invest some £12 or so, in a piece of 6" square x 1/4". Until I know things are going to work out.....   ::)

Decided to fit spokes, only. Drilled & tapped M4......




Realised I could shorten one spoke, for balance.

At 7/8" removed, the big end hung at 3, and 9 o'clock......




Couldn't do much with the displacer. It will have to be unbalanced, for now......





Popped a light under.........




"Oh Happy Day"!!!



 :ddb: :ddb:   :)  :)  :ddb: :ddb:

Blummin big grin time!  :thumbup:



That's quite enough excitement for one day.........  :D

David D
« Last Edit: February 27, 2020, 03:43:55 PM by Stilldrillin »
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Offline stirling lad

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #41 on: September 16, 2011, 12:59:09 PM »
HaHa!! well done David, excellent result ...

IT'S ALIVE!!!

     I'm so pleased for you mate... :clap: :clap: :clap: :bow: :smart:


   ...Mike...
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Offline saw

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #42 on: September 16, 2011, 01:15:52 PM »
So very nice, good work  :clap: :clap:
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Offline danstir4

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #43 on: September 16, 2011, 01:37:48 PM »
Wow, that is great!  Have you considered using rice cakes for the displacer?  (Still trying to find a possible use for a rice cake).
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Offline sbwhart

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #44 on: September 16, 2011, 02:01:51 PM »
FANTASTIC FANTASTIC FANTASTIC FANTASTIC FANTASTIC

 :clap: :clap: :clap: :clap: :clap: :clap: :clap:


 :nrocks: :nrocks: :nrocks: :nrocks: :nrocks:

Great stuff Dave

 :thumbup:
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Offline DaveH

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #45 on: September 16, 2011, 02:47:04 PM »
Dave,

And so you should be pleased :clap: :clap: :clap:

Par excellent :thumbup: :thumbup: :thumbup:

 :beer:
DaveH
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Offline Bluechip

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #46 on: September 16, 2011, 03:41:29 PM »
Hi Dave SD

Nice ...  :thumbup:

Dignified ... presume the drill bit ain't permanent ???  :D

Was going to do a bit of mine yesterday ... until I found my stock of 1/4" brass bar is all 6mm  :bang:
So, off to Live Steam Models at Little Eaton to replenish ..
Popped into Robby's on the way back, and landed up playing with the dog ...
Too nice a day to be inside anyway ..

BC

PS

That balsa displacer intrigues me, wonder if they can be made with Intumescent Foam ??

No idea if it can be machined though ...

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Offline Dean W

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #47 on: September 16, 2011, 04:16:16 PM »
What a smooth runner!  That's great, David!
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Offline arnoldb

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #48 on: September 17, 2011, 04:23:44 AM »
 :clap: :clap: :clap: Great going David  :thumbup:

It runs really smoothly  :bow:

Kind regards, Arnold
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Offline Stilldrillin

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Re: Gold Blend. A Coffee Jar Engine........
« Reply #49 on: September 17, 2011, 04:30:09 AM »
Thanks for all your kind comments Chaps!  :thumbup:

It's tomorrow now, and I've still got a big silly grin!  :D

Ran it again, after mopping out the condensation from the balsa. At the end it was running happily at some 250rpm. Too fast for me.

The single wick burner is too much, having singed the wood slightly. Guess it might run on a tea light, after all....  :scratch:

Lots to do yet.......
Lots of 1.5mm pins to make, cos I keep on loosing 'em on the floor. Need to put the drill back in the rack, before it is lost too!  :palm:

Happy little Drillin......  

David D
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Still drilling holes... Sometimes, in the right place!

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