Northumbrian Build Thread

[peteh]

Postcard from Geraldton Finished our rogaine and can still walk but there were some evil hills on the course. On a more Northumbrian note managed to pick up the loctite before coming up north.

[Jim]

Jun 3, 2012 13:47:46 GMT peteh said:

On a more Northumbrian note managed to pick up the loctite before coming up north.

Stick with it Pete. ;D ;D ;D

[Tony K]

Pete, have sent a PM

[peteh]

Cheers Tony,

reply sent

[peteh]

Momentous occasion folks - It's on wheels ;D ;D

Still got all of the eccentrics straps to replace but will wait until tomorrow when the Loctite has cured.

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[doubletop]

Nice one Pete.

I was wondering when we were going to get the next installment. A major milestone. I like the blue. I think you've got the eccentrics, straps, rods, and valve cranks done so assume you could show us 'the works' between the frames.

You are getting closer to taking a deep breath and tackling those cylinders? Set a weekend, aside read all the notes, get yourself into the right mindset and lock yourself away.

Pete

[peteh]

Full on day in the shed today. Making lots of little 'bits' and also doing some of the final sizing required. I now have the eccentrics, valve linkages and connecting rods all assembled. A bit late however to get a photo(I'll try for tomorrow guys - honest!).
I have made pins for the valve rod to fork assembly from brass hex though not sure if this will be tough enough to stand the test of time. Also not to plan I have enlarged the connecting rod hole from 1/4" to 6.5mm to get a little extra into the bearing on the crank pin.

I was planning on not starting the cylinders until next weekend, so I will have a reasonable amount of time to get into them. Being handed I will draw up in Autocad and then mirror and dimension in metric, which my machines are calibrated in. Hopefully this will aid in both thinking about the machining steps and ensure I don't end up with two left cylinders! I may start on the steam chest and lid first, as I will need the stud holes to match the lid anyway. You can tell by this I do not have DRO's.

[peteh]

As promised, photos in current build state

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[peteh]

and another -

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[Shawki Shlemon]

Very nice Pete , looks great , now it is a loco ;D more to be done but you are looking at a loco , that helps the spirits .

[doubletop]

Pete

It's getting closer to giving it some air time.

Pete

[peteh]

Thanks Gents,

Indeed it is VERY satisfying to get to this stage. However nothing to do tonight except dig in for the severe storm due later tonight (125Km/h winds!) I have been busy however reading up on the cylinders.

[Jim]

Hope all is well there in the west Pete. News reports show things to be pretty hairy over there.

Jim.

[peteh]

Thanks for your concern Jim,

Locally we seem to have got away quite lightly, more damage from the 10 second tornado a few days ago than from the 'severe storm'. Here in Bayswater we didn't get much more than 70Km/h winds so only yard and pool cleaning to be done - there goes next weekend

[Jim]

Glad to hear you escaped storm damage Pete.

Jim

[peteh]

Managed to hide in the shed while 'tidying the garden' ;D I have drawn out the cylinders in Autocad (I'm a draughtsman by trade!) and printed out at full size. This let me stick the separate elevations on to the casting, making selection of start place and seeing how much to take off quite easy. Set up in the 4 jaw and took enough off of the bolting face to give ma a datum.

Clamped in the 4 Jaw with the bolting face on one jaw and turned off the port face. However when I checked the faces were not square to each other.

I thought this should have given me two square faces?

Also cleaned up and fitted my face plate and angle plate and tried skimming a little more off but the faces are still not square - and I am now running out spare metal . How essential is it that the port face is dead square to the bolting face?

I can visualize that the bore and bolting face MUST be parallel so that the piston movement is parallel to the frame. I also understand that the piston rod end (front cover or rear cover) cover plate MUST be square to the bore. but I can not see why the port face MUST be square to the bolting face, only to the bore end.

The error by the way is in fact very minor, certainly less than 0.1mm across the port face but I can see light under the square at one edge.

Needless to say I have stopped for the night anyway now.

[Rex Hanman]

Are you sure the square is square? My old school workshop had about 20 squares and it was best to take an average!

[jma1009]

Pete,

you are making a super job of your loco.

the port face 'error' wont matter a jot on your loco, so dont worry! there are plenty of fullsize designs with angled port faces!

cheers,
julian

[peteh]

Thanks Julian and Rex (Woof right back to you )

The square is square as far as I can determine using the back to back method. I'm glad for your reply Julian as it bears out my thoughts.

Pete

[doubletop]

Pete

As Julian says it doesn't matter that much how square those two faces are. I was going to say I did my port faces with a fly cutter on the mill, with the previously milled face against the vice fixed jaw, so they were square. I did the boring in the lathe But I can't remember how I got the bore parallel to the bolting face and hence the front (gland) face square to the bolting face.

So not a lot of help really.

Pete