Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length.

[ooyah/2]

Morning George....
Mr SAITO produces engines with problematic tube sizing  4.06mm OD......this has been a point of contention with a number of SAITO engine owners over the years.........and the port tapping's are even more obnoxious or bar###rd sizing
The standard 5/32" OD [3.968mm] tube cone for nut & cone connection does not have sufficient wall thickness to leave sufficient parent material for enlarging to accept the 4.06mm tubing
The flange sets as produced by Winfried Niggle whilst are nominated as to suit 4mm, do in fact accept the 4.06mm tubing
In reality, there are two flange set in the steam supply that could have been eliminated & I accept your comment that these flange set will be a heat loss
The other flange sets are on steam discharge [4.06mm OD] or around the de-oiler so are of less concern........Derek

 
 Yes Derek I can see your predicament, hence the flanges.
 
 Did you ever consider making nipples copied from Saito's  and soldering them on to 5/32" pipe still using Saito nuts which would be more cost effective and in my opinion much neater by doing away with the flanges.
 
 In your post No 2 .I see that there are brass pipes going into the steam and out of exhaust if you wish I will make you some nipples to alter the pipe work to 5/32" straight thro' and dispose of Saito's pipe work, that is if you don't have the machinery to make them your self.
 
 Unfortunately since the change over I have never been able to post pics otherwise I would post a pic of my suggestion

If you wish to go down the road of changing the pipe work, P.M. me  with your e-mail address and the dimensions of the Saito nipples and I will make you some F.O.C. if you will pay the postage to Oz.

George.

[derekwarner]

Hullo George......when I mentioned obnoxious or bar###rd sizing port tapping I was being polite.......
Both pressure & exhaust ports accept parallel threaded jamb nuts of 6.89mm OD x 0.66mm pitch [this pitch was the best estimate using CNC measuring equipment]
I understand 0.66P is from BA = 4BA, however I cannot co-relate it with 6.89mm diameter thread

The image shows that the end of the inlet tube is manufactured with a 20 degree captive collar.......it is this 20 degree face that corresponds to a similar 20 degree included angle machined into ports that provides the steam sealing face
The tubes are brass [unsure of the actual material] the cylinder heads are cast bronze [again unsure of the material] there appears to be a seating witness mark on both the inlet tube and the cylinder head face
I did consider cutting & shutting to eliminate the close radius bends, however both the tube piece & captive nuts would have been required to be reused & hence soldering 5/32"OD x 22# tube near impossible considering the constraints
Your offer to produce replacement components is very kind thank you...... however I think I am best stuck with what I have.......Derek

[ooyah/2]

Derek,
 These coned fittings are more or less the same that I make only I use 30 deg to correspond to the Slocum centering drill fitted into the tail stock.

Stick to the old saying " IF IT AINT BROKE DON'T TRY TO FIX IT "

George.

[derekwarner]

All very interesting...........
1. even with cotton string as the base & the nylon washers ......the external Polyfiller coating does not like being bent or distorted 
2. after 3 differing attempts....I have the lagged the individual tubes to try & represent the spiral casing that is used in many real application's
3. should be OK for spraying PM tomorrow ..........
Derek

[hammer]

Well done Derek.     Geoff

[derekwarner]

A few weeks later......... ...steam tube lagging is nearly finished
Next question will be about how to understand the new boiler testing rules where TWO independent make water pumps are required    .......Derek

[Tug-Kenny RIP]

That's a nice piece of engineering, young Derek.   


Ken

[derekwarner]

Thanks Ken.....the engine pressure gauge facing the Stdb Fwd quarter has raised a few questions........
Simple answer is that the 1:20 boiler stoker has a bench seat outby of the boiler room in the sunken foredeck of PS Adelaide to have a cuppa & a smoke whilst watching the gauge pressure  ........Derek

[southsteyne2]

Hello Derek looks really good but  I'm reasonably sure the boiler itself must have a pressure guage and also marked in red the working pressure
Cheers
John

[hammer]

Very professional    Derek. Makes my efforts look agricultural.  Almost to good to use.    Geoff

[derekwarner]

southsteyene2.....may sound silly....but I am having difficultly in removing the gauge bezel on both the 1" dia engine and 3/4" dia boiler gauge ....to inscribe the RED line
Can get the bezel to partly lift when levered against the square of the bourden tube connection block.......but didn't want to damage of force it 
It must only be a simple size for size press on fit.....so a few months back I penned a note to the Miniature Gauge Co in UK with photographs of their gauges + the question but they have not responded
The intended positioning of the boiler in Adelaide is such that the boiler gauge will be visible from aft....and the engine gauge visible when looking from fwd .....
If anyone has an idea in removing the standard bezel....please lend your secrets   
RGY.....   the land of OZ is very agricultural which includes my building work.......   .....Derek
 
 

[southsteyne2]

Derek the red line is to be marked by the boiler inspector and recorded in the boiler log getting mine inspected next week
Cheers John

[KNO3]

Nice to see some progress on this ancient project

[derekwarner]

Well......   ...as someone mentioned it is quiet on Mayhem....so here goes 
 
A few weeks back I kept on splitting the wooden lagging on the engine covers inby of the caps that were being secured by M2 hex bass screws [like 1.5 mm x 1.5mm in a radius in the wooden section ]



Attempted DEVCO plastic metal.....but  no it split away
 
Finally stripped back four planks .....replaced them all is OK...... ........Derek
 
 

[southsteyne2]

Hi Derek someone once remarked that you can own a steam engine until you fire up the boiler THEN IT OWNS YOU I worry what may happen to you if this happens so please come to my place and grab some of the excess timber I have and make a start on that beautiful paddle wheeler as it would be great to see it alltogether
John

[KNO3]

Why don't you add two strips of brass with holes for the screws to hold the wooden cladding to the cylinder?
Besides, you could also reinforce the wood underneath by gluing it to a layer of paper, tissue or something similar.

[derekwarner]

Good to hear from you KNO3.......
The original Saito brass shim cylinder covers have been used to glue the wooden slats as the former
It was the prising & bending to get the shim covers back over the cylinder endcap's that contributed to the splitting of the timber
As usual ...progress is slow with me  [ten year project]   ....how are things in your steam land & Bucharest?........
Best regards Derek
& PS......thanks southstyene2........I seem to be accumulating plenty of timber here.....

[southsteyne2]

You can buy the real deal @ http://www.australia.inbib.com/businesses/search.aspx?action=load&ref=8410 , not sure if it is still available
Cheers
John

[Circlip]

But the insulation on cylinders is usually under the cleading?
 
  Regards  Ian.

[derekwarner]

A little more progress  ....... how many more days spent lagging & sanding & lagging & sanding?........how many mm of tubing can a model engine have? .........

Yes Ian........the air spaces in the cylinder casting/casings  ...& under the cylinder covers are now insulated..........Derek

[Jerry C]

Proper job Derek. I love the bend around the oiler metering valve. Are you a fan of the Olympic system of pipeing?
Jerry.

[derekwarner]

Hullo Jerry..........when I did the tube run last week I thought OK.......

Then the 1:20 Irish insulation crew came on board & layed the rope & your Polyfiller insulation & that fouled the lubricator blow down valve.........

So it was back to another Irish pipework crew to do the U tube modification......... 

Will it ever end?.......Derek 

[Jerry C]

Olympic pipework system:- first trade gets a straight run. Plumber fits engine room wash basin with straight run of 1/2" pipe. Pipe fitters come later and bend 10" pipe around it!!  Worked for years v
Jerry.

[KNO3]

I think you should get a prize for plumbing, this is the nicest I have seen in a long time!

[Jerry C]

Got to agree, it's the best I've seen too. I particularly like the spiral and the exposed flanges.
Jerry.