Potty Simpson and Shipton Short Stroke Engine

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sbwhart:
Thanks Dave

Got some ordered :thumbup:

Stew

Rob.Wilson:
Hi Stew ,,,, :bow: :bow: :bow: the cylinder looks GREAT ,, cracking bit of machining :clap: :clap:

Rob

sbwhart:
Thanks Rob

Got the stream chest finished off, today.

Drilling the holes for the sealing gland.

Next up the little top hat to take the graphite cord.

Turned the OD and reamed through 3mm parted off flipped it round then used a slot drill to cut the flat bottom hole.

Then turned up the spool valve from some silver steel bar,
Drill and tap and acuratly turn the gap and over all length as these are important to the valve timing.

Camera went flat at this stage, and couldn't be arsed to get the spare out of the house.

Finished of the rest of the bits for the gland, this is how they all fit togethere

Then onto the valve cross head bar, made this from a bit of 1/4 square bar, so in the four jaw self centring chuck, rough out the steps.

Then with a thin tool and with the compound slewed over 5 deg turn the taper bits.

Over onto the mill and find the midle of the bar and drill though 3mm index to the outside bits and drill these through 3mm as well.

Then with an end mill thin the end bits out.

Time for an hows it looking.

Stew

arnoldb:

--- Quote ---Time for an hows it looking.
--- End quote ---

:thumbup: :thumbup: :thumbup: It looks GREAT Stew; you've certainly upped the pace now :bugeye:

:beer:, Arnold

sbwhart:
Thanks Arnold :wave:

Things will slow down over the next week as I'm on domestic duties :(

Decided the cross head would look better with the end bits rounded off so made a filing button and nibbled away with files, I think that looks better:-- less clumsy.

Used the rest of the morning making the link bars.

First cut off a length of bar enough to make all three links, then drilled some pairs of 3mm holes 12.5mm apart, the DRO on the mill gets the pitch for each one very accurate.

Cut each link from, then turn a 3mm mandrell on the lathe, bolted each link to it and faced it off to form the arm.

With the same filing button finished the ends off, then drilled and tapped M2.5 for a grub screw.

Job done

Stew

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