Nick Dunhill's workshop NGG16 Garratt

Nick Dunhill

Western Thunderer
...bit more motion bracket progress. Had to cut out a lot of triangles but almost finished now.

44064419910_ffe759ac46_b.jpg


44064419960_e5bbd304e4_b.jpg


Tomorrow hacking up perfectly good expansion link castings......
 

P A D

Western Thunderer
Hi Nick,
That's incredible. I make it 6 parts per bracket x 4. Did you laminate some strips of brass, then cut the triangles, unsolder and clean up, or did you do them individually?

Cheers,
Peter
 

Nick Dunhill

Western Thunderer
...the post where I hack up a perfectly good expansion link so the radius rod will pass the entire length of the slot. This isn't a criticism of Paul's (from EDM) excellent castings, I just wanted the radius rod to function properly although it'll probably not have to on the finished model. I think the pictures show what I've tried to achieve.

30959189367_631e881a02_b.jpg


45848538792_19ac81f9de_b.jpg


The above picture shows a crude jig used to locate, centre and hold the eccentric brackets whilst soldered in place.

45848539392_2e7ca62d12_b.jpg


45898169091_46321509b8_b.jpg


44081830380_dea578f8be_b.jpg


44985133015_6b9c5d3b66_b.jpg


Should be a bit easier from here on.........(ha!).....
 

P A D

Western Thunderer
That piece of wood must be a family heirloom. Either that or being from Yorkshire, you are too tight to get another one. ;)
 

Nick Dunhill

Western Thunderer
....so having gone through a major life readjustment, and moving the workshop to another room in the house, we're off again.

Having finished the new motion brackets it's on to the tortuous process of attaching them to the chassis. Jobs like this are hard. The motion bracket has to be the correct distance from the cylinders and level, and inline with the frame stretcher etc etc. A lot of adjustment was necessary and finally one was in place. I found it a lot easier to attach the second by soldering a length of brass angle to it. I then soldered the angle to the bracket already attached, and a bit of measuring later

46180669551_5deffa8d19_b.jpg


45456553224_67ec1f3d6f_b.jpg


The con rods were assembled next. They're laminated but should have round and not marine big ends as supplied. They were altered.

46180671251_a8da176be6_b.jpg


The slide bars and crossheads were next. The slide bars are made from scrap etch!

31241763307_8f4e824ac2_b.jpg


More soon.......
 

Nick Dunhill

Western Thunderer
...busy at work in run up to Christmas so not a huge amount to report. I have fitted up the wheels and all runs well, so happy with that.

46264689312_bf7c776170_b.jpg


44498388090_2875d49471_b.jpg


Next I have fabricated some reversing shaft trunnions, and fitted them to the motion brackets. They were each made of 5 pieces.

32442683018_e39ef4d88a_b.jpg


46264446172_ac125017d8_b.jpg


32442684628_f476d4bb58_b.jpg


45401970215_4f978bf4a3_b.jpg


45591249304_b7d10070eb_b.jpg


More on this soon......
 

Nick Dunhill

Western Thunderer
.....fair bit of progress considering it's Christmas. I made some lifting links and attached them to the reversing shaft.

32511493568_6a5190bd02_b.jpg


Then I made some drop links and connected it all up.

31444284617_ccdbcb8a30_b.jpg


32511496768_881a83dca7_b.jpg


The return cranks (in the frame) supplied were a bit naff, so I made some better ones (below the frame.)

46332585532_052054025e_b.jpg


I have to confess to a bit of a cock up. The screws supplied for crankpins were of two different lengths, with longer ones for the return crank. I blindly attached the longer screws to the middle wheels!! I needed a solution for attaching the return cranks to the rear wheels now with the shorter crankpin screw. Bah.

I cut and threaded some rod for the con. rod journal,

46383605841_ec222a71d4_b.jpg


and added an appropriately sized spacer.

31444290337_91d2a38af7_b.jpg


This was screwed onto the crankpin and the return crank soldered on at a suitable jaunty angle. Actually a bit less than the correct angle so it can be nipped up on final assembly.

32511502388_4cfdcd6b86_b.jpg


44566668040_6160ed4a13_b.jpg


44566667510_e65d3e102a_b.jpg


Must get round to replacing the drill with an eccentric rod pin.

Happy Christmas all...........
 
Top