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New Project

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Re: New Project

Postby Dalboy » 02 Apr 2022, 17:49

Six Hornstays made and drilled then the horns drilled and tapped followed by shortening the fixing screws as I only had some which were too long these are 5BA bolts

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The centre support rod was cut and drilled either end then tapped 6BA so I took the opportunity to do a dry fit. Hopefully will be able to get the surface plate out and get everything squared up and the holes drilled and tapped to hold the buffer beams in.

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Re: New Project

Postby NickM » 03 Apr 2022, 07:33

It’s really starting to take shape. It looks super.
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Re: New Project

Postby Dalboy » 10 Apr 2022, 10:38

Slow progress I have managed to get the chassis fully assembled once happy that it does not need taking apart again I will go around all of the screw fittings and put some loctite on them. I have turned one of the stretchers as I had it upside down in the picture.

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Thank you NickM missed your reply.

I am now half way through turning the wheels and boy O boy don't you get black hands turning cast iron and then spend 1/2hour cleaning the lathe after a days session(Photos to follow when they are done)

I spent a small amount of time making a mandrel for this little chuck as it only had a 3/8" thread not good to hold it in a collet now it is great for those very small bits

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I managed to pop out and buy these small boring bars for a good price and they were local new inserts ordered and a torx to undo them

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Re: New Project

Postby SamQ aka Ah! Q! » 10 Apr 2022, 11:32

Loving the pictures. In the real thing, the brakes are permanently 'on' unless a vacuum is pulled; does that hold for your model please?
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Re: New Project

Postby Dalboy » 10 Apr 2022, 12:31

SamQ aka Ah! Q! wrote:Loving the pictures. In the real thing, the brakes are permanently 'on' unless a vacuum is pulled; does that hold for your model please?


The brakes are very rarely used on models except to stop it rolling when you are stationary and on this one they are operated by a screw system. I have not yet seen a model with a vac system on the scales I have looked at. Possibly on the larger scales.
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Re: New Project

Postby Dalboy » 10 Apr 2022, 19:50

Have been working on the wheels this is taking a bit of time so far 4 days but that is not solid as I have the garden as well as other jobs.

Started with 6 rough cast wheels which are very good quality as far as casting go no blow holes either

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This is what it looks like all that needs doing now is to make a mandrel and finish turning the outer rims

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Well that is three down before the next stage three more to go then I will complete the rims on all of them as once the mandrel is turned I do not want to loose the setting of it while turning the rims.

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Re: New Project

Postby CHJ » 10 Apr 2022, 22:37

Great progress Derek You might find this interesting, Locomotive Valve Gear
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Re: New Project

Postby Dalboy » 11 Apr 2022, 21:44

CHJ wrote:Great progress Derek You might find this interesting, Locomotive Valve Gear


Thank you Chas. The valve gear on this is the Stephenson's type still a little way in the future I am still working on the wheels
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Re: New Project

Postby CHJ » 11 Apr 2022, 22:08

The most aesthetic looking system I think, leading to cleaner looks with prime eccentric's being buried inside the frame. Another turning challenge for you though, if its a one piece axle.
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Re: New Project

Postby Dalboy » 12 Apr 2022, 16:52

CHJ wrote:The most aesthetic looking system I think, leading to cleaner looks with prime eccentric's being buried inside the frame. Another turning challenge for you though, if its a one piece axle.


All the eccentrics are on the central axle between the frames they will be the next job after the axles. When the axles are assembled the axle blocks need to be fitted before the wheels and the eccentrics only on the centre set. I will be making a jig to aid in quartering the sets when I get there
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Re: New Project

Postby Dalboy » 13 Apr 2022, 16:14

OH bugger it managed to mess up one of the wheels every thing turn on it except the tread went to drill the axle hole and walking to the drill bit shelf thinking to myself must get it to 7/16" yes you guessed it instead of picking the drill smaller so I could put a 7/16" reamer through I grabbed the 7/16" bit and drilled the hole ans as you all will know a drill bit will always drill oversize.
The air was blue for me doing a stupid thing so have just now ordered a new casting.
Yes I could have bored slightly over size and turn the axle to match but I am the sort of person that want it just right(maybe not perfect but the best I can do).
Well at least I could go into the garden and mow the lawn as well as pot on some plants on top of that plant some other bits and pieces we both brought yesterday at the garden centre. I am sure the garden centre cost more than bit for my loco.
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Re: New Project

Postby CHJ » 13 Apr 2022, 22:28

Hard luck, afraid I would have bored the wheel and sleeved it, relying on the paint job to disguise the sleeve.
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Re: New Project

Postby NickM » 13 Apr 2022, 23:36

That’s a shame. Is repairing it such a problem? I’ve had a few woodworking screw ups and I’ve been able to live with them. They’re a reminder to me not to be such a muppet next time! If it will be largely invisible then I could definitely live with it. I’d like the fact I know it’s not perfect but that nobody else does!! You’ll have to go with whatever you’re comfortable with though…
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Re: New Project

Postby Dalboy » 14 Apr 2022, 07:14

Thank you both I certainly would not be happy with a repair of any kind. I am the same when I make the wooden models I have made in the past if a part goes wrong in the bin it end up and a new part made.
I would always know it was there which will bother me
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Re: New Project

Postby SamQ aka Ah! Q! » 15 Apr 2022, 15:24

The brakes....larger scales.


Thanks Derek. Bad luck on the 7/16"th hole; it could happen to a bishop.
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Re: New Project

Postby Dalboy » 15 Apr 2022, 20:55

New casting arrived and turned to the same stage as the rest mandrel being turned so I can work on the treads. i have also marked out for the crankpins.
Will try and get some photos tomorrow
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Re: New Project

Postby Dalboy » 16 Apr 2022, 21:04

As promised photos of the now 6 wheels ready for the turning of the treads as well as a photo of them along side of the chassis which is all assembled.

Mandrel completed and the first wheel mounted I will make a start on them tomorrow.

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This was not all the work today as I did get some more work in the garden which was just silly jobs as the bulk of the garden is complete
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Re: New Project

Postby Dalboy » 18 Apr 2022, 19:49

More gardening this morning just odd jobs but takes some time.

Then into the workshop and drilled holes between the spokes so that I could get a small burr in to clean them out, First photo of all the holes drilled this was done to all six wheels.

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Then onto cleaning the holes out only did one as it was hard on the hands only 5 more to do. Please note the holes for the crankpins have not yet been done as I am waiting for a reamer to do them

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Re: New Project

Postby Malc2098 » 18 Apr 2022, 20:43

Nice.
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Re: New Project

Postby Dalboy » 22 Apr 2022, 20:25

Well the wheels are complete with all the webs cleaned out and the crankpin holes drilled and reamed. I was coming out of the workshop with black hands and face where I wiped it without thinking.

I made a simple jig to aid in drilling the crankpin holes which I did on the milling machine two drill bits and the reamer to get them to a size needed. Now to make the crankpins three different designs and sizes as well as axles. Even then I will not be able to fix them together as I also need to make other parts to fit the axles before the wheels can be pressed together and quartered. That will required another jig to get them correct.

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Re: New Project

Postby Cabinetman » 22 Apr 2022, 23:25

Just realised the scale of the beast you’re making!
Probably wrong but to me the balancing weight on those wheels looks a bit big compared to the mass of the centre lug, have you tried them for balance on an axle? Ian
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Re: New Project

Postby DaveL » 23 Apr 2022, 00:10

Cabinetman wrote:Just realised the scale of the beast you’re making!
Probably wrong but to me the balancing weight on those wheels looks a bit big compared to the mass of the centre lug, have you tried them for balance on an axle? Ian
The balance weight is not just for the centre mass of the wheel, the crank pin and connecting rod also adds weight.
Regards,
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Re: New Project

Postby wallace » 23 Apr 2022, 06:58

I've always wanted to try my hand at model engineering. I picked up a lovely little BCA jig borer for £90 a couple of years ago from facebook.
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Re: New Project

Postby CHJ » 23 Apr 2022, 09:16

Outstanding progress Derek, don't forget to label your working Jigs and keep them safe as a set.
Long after project completion they will have value, especially for someone attempting the project with more limited skills, equipment or time.
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Re: New Project

Postby Malc2098 » 23 Apr 2022, 09:52

Nice.
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