Don Young L and Y Aspinall Class 27 - Not Midlands

[kipford]

Refitted the valve gear and ran it on the drilll, seems to work ok. Joy gear is quite mesmerising to watch. Time to take it all apart again and get ready for the air test.

Dave


Video

[kipford]

Trial fitted the brake gear, most of this was made earlier in the summer. Going to take it all apart again know to get it ready for air testing. I have correctly sized washers to fit in place of the ones shown.

Dave


IMG_2450 by Dave Smith, on Flickr

IMG_2449 by Dave Smith, on Flickr

IMG_2448 by Dave Smith, on Flickr

[coniston]

It's a great feeling when you can put lots of bits you've already made together and realise just how much has been achieved, well done Dave, look forward to the day it steams.

Chris D

[kipford]

Had a delivery from Shapeways today. The front sandbox valve bodies and the pedestal that holds the handle for the damper door are quite complex and not easy to make. In the past I have had the odd lost wax brass casting done by Shapeways, but there are limitations with this and you need to build in shrinkage. So I thought I would try there binder printed steel. In actual fact it is a 60/40 stainless steel/bronze matrix. The steel is printed from powder using a binder resin, then later the resin is removed and infused with bronze. They say it is ok for bottle openers but not suitable for load bearing, so it is fine for this application. It is so easy to do, upload stl file, pay money wait 2 weeks for the bits arrive. For small parts this is reasonably cost effective, but as parts get larger the cost gets a bit heavier. Anyway these 3 parts were £58 delivered to my door. I am very pleased with quality if the prints and will certainly consider doing some more. By the way apart reaming a couple of holes they are ready to fit.

Dave


IMG_2485 by Dave Smith, on Flickr

[kipford]

Question for the membership. As I move towards running on air I have a question on the axle boxes. The design includes a cavity in the brass lower half to accept I believe a felt pad to act as a form of oil reservoir. Don's drawings do not mention this. I am correct, if so is it fabric felt, can it be layered and what sort of compression is used? The screen grab show the axle box with top reservoir shown and the lower cavity marked. Thanks in advance.


Axle Boxe by Dave Smith, on Flickr

[don9f]

Yes the cavity is for “bearing felt”....I use the same stuff that’s used full size, e.g. for the pads in the ends of the underkeeps, that lubricate the thrust faces of the axleboxes / backs of wheels. I would suggest not much compression is needed, as long as the felt actually contacts the journal it will do the job.

Just thinking about it, the felt “wipers” on the carriage of my lathe are probably made of the same stuff?

Cheers Don

[Deleted]

Hi Dave

Yes that's the same as 'Doncaster', felt pad in keep cavity. I assume that DY also shows the 3 oilways, two horizontals, one to each horn and a vertical rear of centre down to the axle.

Regards

Pete

[simplyloco]

Dec 15, 2020 23:16:10 GMT don9f said:

SNIP
Just thinking about it, the felt “wipers” on the carriage of my lathe are probably made of the same stuff?

Cheers Don

Have you seen the price of them? The ones for my Maximat V10P appear to be worth their weight -literally- in gold!
John

[kipford]

Pete

Yes the set up is the same as you describe. So next question what type of felt? None of the ME suppliers seem to stock it. I can get this on ebay

Ebay link

Is this any good?

Dave

[Deleted]

Dec 16, 2020 10:19:54 GMT kipford said:

Pete

Yes the set up is the same as you describe. So next question what type of felt? None of the ME suppliers seem to stock it. I can get this on ebay

Ebay link

Is this any good?

Dave

So far I have fitted the felt pads that you can buy to stick under furniture. IIRC I bought a pack of different sizes online, perhaps from Amazon?
I cut them to suit, so far I have them in the tender axle box trays, cartazzi axle box trays and in the main and bogie keeps.

I can't say how well these will work yet but they seem ok, time will tell.

Pete

[kipford]

Pete
Thanks, done what you say and found some that are suitable on Ebay. The Aspinall tender does not use them and any way I have needle rolled the tender axle boxes.

Dave

[Midland]

Hi Dave
Inspiring, my Aspinal is on on the bench!! Will need your advice.
Cheers David

[Midland]

Nov 21, 2020 9:24:21 GMT kipford said:

Andy
Agreed, that is a trip I want to do sometime.
Dave

Dave
That is a me too as I would love to get photos of the detail to add a bit. Fancy sharing the driving etc
David

[kipford]

David
When all this rubbish is finished yes sounds like a plan.
Dave

[kipford]

It is a long long time since my last update (the whole of lockdown), but I have been busy apart from buying Conistons Super Simplex to play with while I finish the Aspinall.

So where am I? Ignoring any painting:

A complete tender

A complete rolling chassis, that runs on air.

All the platework except the boiler cladding finished.

So the boiler is next. The boiler is deviating slightly from Don’s design. The following sumarises the changes which are in line with the AMBSC code and have been agreed with our club boiler inspectors

A Reduction of the fire box by 3 mm to provide sufficient clear to the rear horn blocks.

B Parts threaded into the boiler to be attached using threaded phosphor bronze bushes.

C Move blow down valve from front to one each side of the firebox,

D Change inner and outer wrapper material thickness from 2.0 mm to 2.5 mm (easier to get 2.5mm material.

E Change from threaded side stays to copper rivets.

F Replace the crown girder stays with rod stays.

I have all the copper and bronze required to build the boiler and have made the formers need to make the flanged parts. I am also just finishing the form tools for the inner and outer wrappers.

So to the photos:

The first few are of the loco as it stands today.


IMG_2783 by Dave Smith, on Flickr
IMG_2784 by Dave Smith, on Flickr
IMG_2785 by Dave Smith, on Flickr
IMG_2787 by Dave Smith, on Flickr
IMG_2788 by Dave Smith, on Flickr
IMG_2799 by Dave Smith, on Flickr
IMG_2945 by Dave Smith, on Flickr
IMG_2972 by Dave Smith, on Flickr
IMG_2947 by Dave Smith, on Flickr

Next where I am with the boiler.
First some material
IMG_3027 by Dave Smith, on Flickr

Boiler Formers for flange parts in manufacture and finished

IMG_2957 by Dave Smith, on Flickr
IMG_2960 by Dave Smith, on Flickr


3D printed outer wrapper former, Inner wrapper is not quite finished.

IMG_3023 by Dave Smith, on Flickr
IMG_3024 by Dave Smith, on Flickr

Dave

[kipford]

All ready to start! These are 3mm thick parts and I will cut them out on the band saw at the model railway club tomorrow night. Rebuilt the brazing half yesterday with Thermalite blocks, so it looks like the weekend will see a first attempt at flanging.
IMG_3040 by Dave Smith, on Flickr

Also could not resist this, starting to look like a proper engine.

IMG_3039 by Dave Smith, on Flickr

Dave

[kipford]

And so the hard work begins:
I cut out all the parts on the bandsaw at the model railway club last Thursday night. Today I flanged my first ever part on a boiler, the front tube plate. My big Sievert torch with a long extension made light work of annealing the part. It took about 6 anneals to fully form the plate. I was actually surprised taking it slowly how easy it was (famous last words).

All the bits need to flange the plate.

IMG_3042 by Dave Smith, on Flickr

First anneal 

IMG_3044 by Dave Smith, on Flickr

6 anneals later, quite pleased with it. Now it needs the outer diameter skimmed to fit the boiler tube, milling to the correct flange height and the tube hole drilled.


IMG_3045 by Dave Smith, on Flickr

[mugbuilder]

Lovely job, Great to see such fine workmanship.

[kipford]

The basic flanging and forming is now finished. Tomorrow it back to the mill to drill all the holes for the various bushes. I am in the middle of building an assembly jig to enable me to drill bolt/rivet holes for holding the assembly together when it is silver soldered. I will post some pictures of the jig when it is finished.

Tube plate, back head, firebox ends and throat plate. The throat plate is not distorted by the way it is a quirk of the photo.
IMG_3082 by Dave Smith, on Flickr

Outer and inner wrappers and their 3D printed formers. These formers worked just as I wanted and were strong enough to allow the reverse bends in wrappers to be formed using a dead blow hammer.
IMG_3091 by Dave Smith, on Flickr.

All the basic shell parts together.
IMG_3092 by Dave Smith, on Flickr

Dave

[steamer5]

Hi Dave,
Nice work!
Your 3D printed formers looked to have worked a treat!

Cheers Kerrin