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New Project

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Re: New Project

Postby CHJ » 18 Jun 2022, 13:21

Fantastic progress Derek, fingers crossed for the fitting of all the rods and free rolling.
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Re: New Project

Postby Dalboy » 19 Jun 2022, 14:09

Have started the coupling rods and have marked where they go on a piece were they will eventually be machined off just there while I do the ends of each one as I need them handed.
Also the note book for some vital measurements which need to be taken from the build rather than direct from the plans(this is stated on the plans).

Just going to set the front pair on the mill to drill the holes used for reference these will then be opened up for various bushes later on

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Re: New Project

Postby Andyp » 19 Jun 2022, 15:32

What some people are able to produce in their sheds still leaves me in awe.
Were you any sort of engineer in a previous life Derek?
I do not think therefore I do not am.

cheers
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Re: New Project

Postby CHJ » 19 Jun 2022, 18:10

Dalboy wrote:.......
Also the note book for some vital measurements which need to be taken from the build rather than direct from the plans(this is stated on the plans).


Yes in the real world, be it full size or scaled, individual fit inevitably provides the best outcome.
Multiple Zone tolerances have a habit of biting when least expected.
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Re: New Project

Postby Dalboy » 20 Jun 2022, 08:28

Andyp wrote:What some people are able to produce in their sheds still leaves me in awe.
Were you any sort of engineer in a previous life Derek?


Previous life before retirement I was a plant mechanic, I only had to measure in thousands of an inch then now with this I have to make lots of bits to that kind of tolerances.

I am still only learning as well as digging back to school days of trigonometry in some cases.

CHJ wrote:
Yes in the real world, be it full size or scaled, individual fit inevitably provides the best outcome.
Multiple Zone tolerances have a habit of biting when least expected.


They do say that the real world things never measures up :lol:
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Re: New Project

Postby Dalboy » 21 Jun 2022, 20:29

Started on the centre joint for the coupling rod. All the marking out lines are only there as a sanity check at which parts need cutting away I will be using the DRO for final machining

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The two rear coupling rods centre joint shaped and machined to thickness

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Still need to slot the two on the left so the ones on the right will fit inside them they will be held in place with a bronze bush. Once they are complete I will then need to do the other end followed by slimming them down both height and width

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Re: New Project

Postby Dalboy » 23 Jun 2022, 08:50

Front coupling rods now slotted. some fine turning as the cutter left the surface a little ridged I think this was because I only had a long cutter of the size I needed. Next will be to open the holes to fit a bush the one on the left needs to be a tight fit where as the right hand needs a sliding fit. Then onto test fitting and final drilling of the holes at either end once I am happy with all that all the waste material will be removed as for now it helps keep the pieces more ridged for working on

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Re: New Project

Postby Malc2098 » 23 Jun 2022, 09:40

Nice.
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Re: New Project

Postby Dalboy » 08 Jul 2022, 22:27

No real updates as I managed to stuff up one of the coupling rods then remade it twice :oops: :oops: :oops:
Still doing the machining on it as I had to wait for some metal to turn up.

I did however manage to get the slide valves made.

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Re: New Project

Postby CHJ » 08 Jul 2022, 23:20

It's progress, and it rarely comes without the odd frustration.
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Re: New Project

Postby Dalboy » 07 Aug 2022, 22:16

More progress after a break to make a Rubbish truck for a little boy.

Anyway managed to machine some reference surfaces on the cylinder block and the steam chest, this gives me somewhere to take all my measurements from

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The steam chests almost complete by that all the main surfaces now machined and turned to final dimensions. since this photo I have driled and tapped for the packing material just a nut to machine and the mounting holes which will be done when the cylinder block and steam chest covers are finished.

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More work on the cylinder blocks the mounting flanges machined on the tops and the port face brought to size to match the steam chest sizes. Still need to mill the ports but no cutter so have to wait for those. I have since mounted these blocks and started to bore the cylinders using a boring head on the mill

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Re: New Project

Postby droogs » 07 Aug 2022, 22:23

I thought the truck for the little boy was rather good :| :lol:
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Re: New Project

Postby Dalboy » 10 Aug 2022, 12:40

Spent the other day boring the cylinders quite pleased with the finish.

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I also managed today to take the mounting flanges down to 1/8" and do a test fit to the frames a very light filing was needed to get them to fit comfortably with no slop I must get back to the coupling rods before I go to far

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Re: New Project

Postby CHJ » 10 Aug 2022, 13:43

Great progress, have you got a couple of meters of track section available for rolling tests?
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Re: New Project

Postby Dalboy » 10 Aug 2022, 16:00

CHJ wrote:Great progress, have you got a couple of meters of track section available for rolling tests?


No test track but will make myself a simple rolling road from some channel and 12 ball bearings
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Re: New Project

Postby Dalboy » 24 Oct 2022, 17:44

Things on the loco build have been a bit slow what with the excavator build and gardening preparing for our winter, digging up some of the dahlias for winter storage and dividing, picking some brussel sprouts and freezing them for the wife I hate the things.

Anyway I have managed some work on the cylinder end caps one end is pretty simple case of just turning to the correct size the other end has the gland nut and packing for the piston rod they still need a little work as they still need the gland milling to the correct size and the hole enlarged to be threaded for the gland nut.

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I also managed to turn the two crosshead gudgeon pins which also needed a slot for a scewdriver to fit them. I did have to make one of them twice as they are fiddly to make they only have 1/2" diameter heads

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Re: New Project

Postby Malc2098 » 24 Oct 2022, 18:27

Nice.
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Re: New Project

Postby CHJ » 24 Oct 2022, 19:56

Very neatly done as usual.
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Re: New Project

Postby SamQ aka Ah! Q! » 24 Oct 2022, 20:58

Spent the other day boring the cylinders quite pleased with the finish.

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Gad, just for a moment I thought you were boring that out with the hole gauge...
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Re: New Project

Postby Dalboy » 24 Oct 2022, 22:26

SamQ aka Ah! Q! wrote:
Spent the other day boring the cylinders quite pleased with the finish.

DSCF2712.JPG



Gad, just for a moment I thought you were boring that out with the hole gauge...


Looks like it from the first photo in that post just measuring to see if more needed to come off
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Re: New Project

Postby Dalboy » 24 Oct 2022, 22:27

Thank you Malcolm and Chas plodding along very slowly
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Re: New Project

Postby Dalboy » 24 Mar 2023, 20:50

Did not realize that I have had no updates on this build but it did stall for a while as I had to make some Christmas presents and then when I did get back onto the build I made a right mess up of the cylinders which I am now awaiting some replacements of.
In the mean time I have been working on a Farm Boy hit and miss engine and have nearly completed the front frame of.

Some very interesting set ups to get this far

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Re: New Project

Postby CHJ » 25 Mar 2023, 10:13

Outstanding finish on that intricate form Derek, excellent machining setup and cutter control to get such smooth blending of curves.
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Re: New Project

Postby Dalboy » 25 Mar 2023, 12:00

CHJ wrote:Outstanding finish on that intricate form Derek, excellent machining setup and cutter control to get such smooth blending of curves.


Thank you Chas. I have not posted much lately so need to catch up.

I have learnt so much in this piece not how to set up for the different cuts and forms. It takes me a long time as I am double checking every measurement except one which I messed up but to not cause any problems so have left it and it will not notice in the end engine build thankfully.
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