Potty Simpson and Shipton Short Stroke Engine

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

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.

:ddb: :ddb: :ddb: :ddb: :ddb:

Stew

Stilldrillin:
By ek! That's a bit clever Stew! :clap: :clap:

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

David D

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

saw:
Extremely nice work, you're the man :clap: :clap: :clap:

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

:D :D :D :D :D :D :D

Stew

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