Potty Lads and Dads Mill Engine

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Few it was time to stop so many pictures in one shot
I was under the impression of watching a REEL GOOD MOVIE

very nice workThm:
Phew:- Thanks for your replies Guys for a moment I was beginging to think every one had been abducted by little green men

My offering this morning are just a few of the fiddly bits that need doing.
Drill and tapped the eccentric for a M3 grub screw

As I drew the engine up I relised that there was no provision for setting the valve event, I scratched my head on this one for some time then I had a look through the pic I took of the origonal engine to see how they did it.

So decided it would be best to try and copy this arangement.
This require some 3mm dia cross holes drilled. The parts are made from 6mm dia stainless first off I drill and parted off a thick washer with a 3mm hole, I then used this to locate for the cross holes.

It was just a mater then of turning up the parts.

This is how the orangement looks on the model, that cap screw gets in the way so I'm going to replace it with a grub screw.

I'm keeping my fingers crossed that it hase enough movement to activate the valve.
Interesting method of providing for valve adjustment.
Looks like it won't be long now before first run.
Hi Stew, I'm following along and learning. I particularly like you made a dead centre and then used the chuck to drive the work between centres. I can see me using this for conrods too.

Thanks Ernie/Jim

I'm waiting on some steel tube to make the fly wheel so decided to get on and finish the bed plate off, I carfully marked the position for the crank bearing and drill them out 2.7mm clearance on M2.5. The bit of ally I made the bed plate from was 3" wide I wanted 2" but that was all I could get so had to cut it down, using a hack saw and a guide plate, so that things didn't wander off.

Then filed the cut off level, noting too fussy just as long as it doesn't offend the eye.

The drill 4 corner holes and filed some fancy rads on the corners.

Assembled the engine back to the bed plate, and fixed a carrier to the crank shaft to try and turn it over, turned over ok, but the valve rod thing fouled, did a bit of adjustment, phew ther's enough clearnace for it travel its full movement, I roughly set the valve and spent 1/2" turning it over by hand it nows turn over nice and free.
Can't wait for that steel to arrive.
Decided to make the base, these sort of engine often stood on stone plyths, so got hold of some chip board, cut two bits off to size and rounded the edge, then cut and filed some nicks along the edge to simulate the stone courses.
This is what it looks like.

I'll give it some licks of paint I'm hoping that it will keep its rough texture to look like stone. I aplied some wood glu and clamp them together, I'll see what they are like tomorrow.
Nice looking build you have going there Stew. Thanks for posting the pictures to show the setups and how engines are created from pieces of metal.
Thanks for looking in bazz

Still waiting on some material to finish this engine off, in the mean time visited our local hobby craft shop and they were having a bit of a clearance and picked this stuff up to have a try at staining the wood chip

Its water based wood stain and some felt tip pens, after a bit of a play I found that the tips were next to usless dried out that is why they were cheep, so instead I had some white emulsion paint that I added some of the wood stain to and added that with a thin paint brush to show up the cement bonding, I aint no Rembrant when it comes too paint. I then sealed it off with the PVA watered down a bit.
I don't think it looks too bad.

Now where is that post man
Cheers :D
Well the posti dropped off the material for the fly wheel. :ddb:
So first job was to cut off a 1" slice from the tube its 100 od with a 4mm wall.

Then face to length 3/4"

Skim up the OD

Then clock up the OD in independent four jaw chuck because the tube is relatively thin and it distorts some what with the internal stresses it a bit like trying to clock up a bit of jelly, just get it as good as you can as long as it doesn't offend the eye.
And skim up the bore.

And turn a step for the hub to but up against.
Next up the hub this is made from a chuck of 1/4 ms plate 100mm square. first mark up the centre and draw a circle 100mm dia and trim off the corners with a hack saw.

The drill and 1/2" hole in the middle

And mount it on an 1/2" mandrell and turn up the OD for a nice push fit into the rim.

On the original Bolton museum engine the fly wheel doesn't have spokes just 4 holes I don't know if this is the original fly wheel or one the Bolton lads have knocked up. So drill 4*22mm dia hole in it.

Turn up the inner hub a nice tight fit it the outer bit.

And stick the lot together with high strength Loctite.

Its doing its curing thing now until tomorrow when I will finish it off, I have a few domestic duties to do this afternoon. :(
Great build Stew! I've been watching just haven't spoken up. This thread is inspiring me for sure, keep posting progress and I hope to see video when it's running.

Looks great! Very interesting to watch your progress as I work through my version of Elmer's #33. Similar original concepts, though I am making extensive use of my CNC mill to complicate things.

Thanks for you're interest Thayer Elmer's engine were the inspiration for this build

Thanks Chaps
This mornings task to complete the flywheel, just griped it in the three jaw to see how it was running, and it looked good so drilled and reamed 6mm for the crank shaft.

Then spent the next couple of hours striping down and adding studs and sealer where required and chasing out tight spots then I wen and lost one of the main bearing searched every ware, brushed the floor, I gone though the cussing stage into despair, so went and asked the Boss to help me do a CSI search of the shed, "what are we looking for" "one of those", I said pointing to the remaining bearing, " so there should be three she said", "No", I said a little tetchy, " there's two" "well she said there's two there pointing"
Can you spot the missing bearing

I can play a mean pin ball
So with that mystery solved a roughly set the timing, and with not much hope gave it some air.

Thanks all for your replies and support Chaps its very kind of you.
I must say its been a fun build.
Spent sum time fine tuning her, tightening and loosening nuts to see what happens as a result I've packed one of the bearing up a little, they weren't quite level, and I've also packed the cylinder up a little, I recon it wasn't quite lining up with the slide bars.
I'm going to have another fiddled with her today (the engine that is ;D) I still think there are few improvements to make to her running.
Then its time for a bit bling, acorn nuts on the top of the slide bars, I think I'll increase the size of the hold down bolts on the bed plate to M4 and add some bolt down pads so it looks a bit more like a casting, then its a strip down and a bit of paint:- apple green fro the engine and red for the fly wheel and I'm going to had some wooden cladding to the cylinder, and finally a nice hardwood base, and that should be just about job Done.
Ho and a nearly forgot, bring the drawing up to date and write it up for the Model Engineer.
Well nobody would think to look THERE for the missing bearing!

It is a corolllary of Murphy's Law that the first person to look over your shoulder will spot the fault immediately. Works every time.

Cheers Jim

I've been busy revising the plans if anyone wants a copy just send me a PM with your email address and I'll send them.


Well got it all painted and polished up hers a few glam shots

Very nice. Masterly work as always.
Your use of particle board for the bricks in the base adds a distinctive touch.
I can see I'll make one of these.