Chris's Holly Pumping Engine Build

[EricB]

<a href="https://www.youtube.com/watch?v=KhlJp1VZMB8" target="_blank">http://www.youtube.com/watch?v=KhlJp1VZMB8</a>

Just found this while looking for something else. Enjoy

Eric

[crueby]

Thanks Eric, that's a great video. I came across it while researching the Holly, there are more details and clips at the Kempton website,  https://kemptonsteam.org/collection/triple-expansion-engines/


I would absolutely love to see it running in person, yet another reason to get back to London again. Spent a week there in 1996, got to lots, like Greenwich and such, still lots to see.


 

[EricB]

I get the impression that your scale model will be about the size of his starter engine. Wow!

Eric

[crueby]

I get the impression that your scale model will be about the size of his starter engine. Wow!

Eric

Almost that tall including the pumps!  Hmmm, wonder if Surus has castings for that barring engine...!

[crueby]

It never hurts to ask, just sent in an email to the Kempton organization to see what information they have on those engines....

[Roger B]

Splendid work as ever     

Material supplies seem to be becoming harder everywhere  In my day job delivery dates just keep going out what was normally 6 weeks is now 12 weeks, a new crosslinking facility that might have been 9-12 months is now 14-16 months (or more  )

[crueby]

Splendid work as ever 

Material supplies seem to be becoming harder everywhere  In my day job delivery dates just keep going out what was normally 6 weeks is now 12 weeks, a new crosslinking facility that might have been 9-12 months is now 14-16 months (or more  )

Thanks Roger!

Latest reply from Midwest is that 'it went to UPS today, tracking should update tonight'.  We'll see. Getting a nasty ugly hungry shop gnome ready for insertion....  (anybody remember Fawlty Towers episode with the incompetent (like Basil) builder Mr Stubbs? )

[crueby]

First bearing block is fitted to the first side rail....  Three to go.

Went on fairly easily, a little scraping needed in the inside corner of rail where I had to back cut it by hand the other day, but nice snug fit sliding it on.

[steamer]

Oooooooh.....Brass!!!    I like brass!   

Dave

[crueby]

Oooooooh.....Brass!!!    I like brass!   

Dave

Me too, carves great. Too bad its not better with chocolate!

[steamer]

Damn site more expensive than chocolate too!


 

[crueby]

Some more yummy brass working, got the second of four bearing blocks notched to fit over the engine beds

[Kim]

Nice work, Chris!  Only two more of those to go?

Kim

[crueby]

Nice work, Chris!  Only two more of those to go?

Kim

Yes - there are six side rails, but the end cranks are open so they only have a bearing on one side. When I get to drilling the holes for the bearings, getting everything lined up across all three bed plates is important, but difficult since all three are bolted to seperate support legs. This means rather than all three on one common base plate, there are 21 parts between the bed plates and the common base - lots of places for tolerances to stack up! Putting a straightedge across all three makes me thing things are very very close, which is great. Still, I am thinking that I'll bore the holes in the center bed plate, then make a pair of temp bearings sized for a long drill, which will be used to mark the actual center of the crankshaft on the two outer bearing blocks of the six. It will be interesting to see how close it comes to the measured location! The bearings themselves can be bored slightly undersize and lapped out to take care of any slight misalignments. I've never made a model with this layout, other three-cylinder ones were on one common bed plate, so this should be interesting!  The crankshaft and bearing setup when done looks like this:

[cnr6400]