Potty Simpson and Shipton Short Stroke Engine

[doubleboost]

Hi
Stew
Coming on leaps and bounds
Did you get some 2mm studding
I could always screw cut you a length 
John

[sbwhart]

Hi
Stew
Coming on leaps and bounds
Did you get some 2mm studding
I could always screw cut you a length 
John

Yes I did John a 1M length from flea bay £8 including postage

No idea how they managed to screw cut that length 

 

Stew

[arnoldb]

Good going Stew 

 , Arnold

[sbwhart]

  Arnold

Finished off the con rods

Drilled and reamed



Then turned up the bearings I needed eight of them  I didn't want to P*** about to much, so turned a length of bar for a good fit in the con rod ends and parted off.



I'm using my independat four jaw that chucks up very true, this allowed me to drill and ream right through the bar.



Then it was just a matter of parting the bearings off to length, fitted into the con rod with a spot of bearing retainer.

A bit of work with filing buttons to shape the ends and this is they fit to the cylinder



Thing comming together well

Stew

[saw]

As usual very nice build Stew

[sbwhart]

Thanks Benni you'll like this next bit :------------ I did 

Eccentric strap:- I've had it in mind to make the strap silimar to an eccentric on an 1850 ish beam engine I saw in a museum, it was a lovely cast iron job with a delicate latice work of circles, this will be too small to do the cirlces but I fancied doing something in that flavaour.

First part the strap end, cut off a sliver of brass 5mm wide drilled an hole up the middle and mounted it on a mandrel in the rotary tabel, and generate the strap end out.



Then drill and tap M2.5



Split it in half bolt it back together and grip it in the self centering four jaw and bore it out.



I've spent ages thinking how to do the next part, I've had all sorts of complicated plans, in the end i decided to go the simplest way as i'm a bit of a simple bugger at heart.

So milled out a couple of 3*5mm wide strips of brass and with a big chunk for the other end to give me plant to machine to get it squared up after soldering.

Filed an angle on the end of the strips and butted them up against with a bit of flux and a few nuggets of silver solder, and a few weights to stop it moving:- and solder it together.



Onto the mill and sit the strips on a thin bit of strip and gripping the chunk mill the chunk up square to the strips.



Cut the strips up to length, and file a chamfer to but up against the strap end.

Then back on to the soldering hearth and solder



A couple of hours in the pickle, drill the cross hole and cut the slot



A bit of attension with files and it's not looking too bad.




 

Stew

[Stilldrillin]

By ek! That's a bit clever Stew!   

Well thought through, and carried out....... Looks great too. 

David D

[doubleboost]

Hi
Stew
That is a astounding bit of fabrication soldering & machining
You have the proportions spot on
2.5 mill threads 
John

[saw]

Extremely nice work, you're the man 

[sbwhart]

Thanks Dave/John and Benni

Got the eccentric finished off today

With a bit of bar in the lathe face and turn OD, then with a parting blade turn the 20mm dia * 5mm groove for the strap.



Tranfer the chuck over onto the mill centre it under the spindle and off set 3.2 and centre drill.



Back onto the lathe this time with a independant four jaw chuck and with a wobble bar clock the centre true



Then drill and ream 8mm and turn the boss down.



In the three jaw chuck and part off.

Drill and tap M3 for a retaining grub screw



Job done

Time for a lose assembly of the parts made so far.





It looks more like a knitting machine than an engine, i wouldn't be suprized if it knitted me a pair of socks when it starts up, would any one like to place an order for a pair

 

Stew

[doubleboost]

 
Very nice 
John

[BillTodd]

Lovely work Stew

I notice the piston rotating cranks are both set at the same angle, shouldn't they be at 90° to each other ?

Bill

[sbwhart]

Lovely work Stew

I notice the piston rotating cranks are both set at the same angle, shouldn't they be at 90° to each other ?

Bill

Yes you're right Bill it was just a lose assembly to get an idea of how it fits together, I need to make base before I get om and make the bearing and fly wheel, don't think there is much more to do then.

Stew

[Brass_Machine]

Wow Stew. That build is coming along quite nicely.

 

Eric

[sbwhart]

Thanks Eric

Things slowed down durring the past week while a did a little commission work  .

Started on the base, first I squared it up to size, then drilled and tapped the cylinder fixing holes for M3 studs.



This was so I could set the cylinder down and get some idea of whare the cut outs were to go and how much to cut out.

Then marked them out with the height gauge centred popped the lines and hatched them out some, so I didn't get mixed up.



Then drilled the coners of the cut out first.



Then chewed them out with a slot drill.



Quick look see



Now on with the columns, I'm fabricating these out of ally bar, for the fluted column I'm using 9/16" bar, first cut the bar down into handy lengths than face and centre drill one end. In the spin indexer with a 1/4" ball nosed cutter mill the 12 flutes.



This is whare the power feed on the mill pays for its self, whist it was doing its thing, I fired up the lathe, and parted off the bases from some 20mm square ally bar.



I'd have got these roosters finished today but my boss dragged me out of the shop to go the Docs for some injections for our visit to Africa. :-   Now got a sore arm 

Stew

[DaveH]

Stew,

My word it does look good, 

So where in Africa are you going?

 
DaveH

[sbwhart]

Thanks Dave

Were going to Tanzanei just a 10 day visit but were packing a lot in:- Serangete, Orongoa Crater, the low bit of Kiliemanjaro, looking forward to it.

[sbwhart]

As these parts will have a delicate edge that will be easily damaged by the chuck jaws I made a split collet, to hold them.



Using the split collet part the flutted collumns off to length.



Then as its important that the collumns are all the same length I fitted my back stop into the spindle nose, this is it with a few of the interchangable ends i've made for it.



Then using the back stop face, drill and tap M3, I though I had a picture of this but no.

Here they are done they are all within 0.05mm



Again using the back stop face off the square bit so they are all the same thickness

Got a pic of this 



Her they are with the columns



Stew

[Bluechip]

Looking good Stew 

Like the flutey bits ... might have a go at that myself, now I've replaced the stripped gears on the mill ... 

Don't ask ... 

Have fun in Tanzania. Been to Serengeti & Kilimanjaro ... it's BIG ... 'kin huge ...

Is Olduvai Gorge on the list? Interesting place where Dr Leakey dug up the Lucy fossils..

EDIT  No. it wasn't Lucy, but there were some early hominid fossils there IIRC.

Don't forget my stick of rock will you ??

BC

[sbwhart]

Looking good Stew 

Is Olduvai Gorge on the list? Interesting place where Dr Leakey dug up the Lucy fossils..

EDIT  No. it wasn't Lucy, but there were some early hominid fossils there IIRC.

Don't forget my stick of rock will you ??

BC

No unfortunatly not, some sort of dispute going on over the charging to get in 

Your stick of rock is on order. 

Stew

[Bluechip]

That's a shame .. I found it very interesting. To see a 'floor' where early humans had been 500,000+(?) years ago.

It was Dr. Mary Leakey there at the time. We had a personal tour with an African Paleontologist for a couple of hours.

I found it fascinating, but then I've always been a bit 'fossiley'.

Not a lot to do with your engine though. 

BC

EDIT

Flamin' 'ell  .....Dr. Leakey was there when we went. Not 500,000 years ago ..   

[sbwhart]

That's a shame .. I found it very interesting. To see a 'floor' where early humans had been 500,000+(?) years ago.

It was Dr. Mary Leakey there at the time. We had a personal tour with an African Paleontologist for a couple of hours.

I found it fascinating, but then I've always been a bit 'fossiley'.

Not a lot to do with your engine though. 

BC

EDIT

Flamin' 'ell  .....Dr. Leakey was there when we went. Not 500,000 years ago ..   

Yes it is a shame it was in the origonal itinery but has since bin taken out.

Bit more done on the engine the pillar parts was more about mass production than anything, made the roundels from 20mm brass bar, i'm going to paint the columns mat black and leave the roundels shiny brass 

Used a form tool to form the rads drill and parted off



Sorry about the crap pic.

Then with the back stop faced them all off the same.



Then turned up a mandrell a blended things in and gave them a polish.



This is how one looks like.



And time for an interest boosting assembly.



Not looking too bad.

Stew

[saw]

Wow Stev this is rely something another masterpiece here on MadModder 

[arnoldb]

Not looking too bad.

Now THAT is an understatement Stew !
It's looking fabulous

 , Arnold

[sbwhart]

Thanks Bennie and Arnold

Its bin a good day in the shop finished off the fly wheel.

In the independat four jaw true it up so the inside of the rim is running true, then clean up the hub and the inside of the rim, face and turn a register on the OD.



Turn it round clock up the register true, and clean up as for the first side.

Then griping on the inside of the wheel clock the register true and clean up the OD, and drill and ream 8mm



Job Done



Stew