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Thread: Rob Roy
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14th January 2022, 06:02 AM #1
Rob Roy
I have just had a major workshop rebuild and now have plenty of room for some new toys, so with new toys comes a new project.
Now this may be a very long build as most things when working with metal I will be working in thousands of an inch which is totally different to when I built wooden models.
This is a build of a loco called Rob Roy a Caledonian 0.6.0 tank locomotive which is a 3 1/2" scale, this hopefully will be driven by live steam. As I stated it will be a long build as I am also learning how to use some of the machines and trying to understand a DRO on the milling machine.
I received the plans from my good lady as a Christmas present which I spent quite a few hours studying and deciding how to proceed and like many build I have done in the past with wood the best place to start is the chassis.
Two pieces of steel were rough cut just over the final main dimensions and three holes drilled through both in the waste material where the horn blacks will eventually slide this prevents the two from moving making sure that both are identical except for about 5 holes which will only be drilled in one of them but more of that when I get to that.
You can see the three rivets in the photo which are counter sunk on the reverse so they sit perfectly flat. I have also milled the left hand side and the long edge facing us so these will become my reference edges and the corner will be the datum from where many measurements will be taken. The right hand edge has been cleaned up so an accurate measurement for the length can be calculated.
There will be plenty of holes to drill countersink and ream on these. Being my first attempt at this type of modelling I will need all the luck I can muster and of course double and treble measuring before cuts are made.
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14th January 2022, 09:19 AM #2GOLD MEMBER
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Good on you Derek for starting this model.
Will be very keen to see as many steps as possible in this build. With your skills it will come up beautifully.
Regards
Keith
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14th January 2022, 04:51 PM #3
Got to have a ticket on this train ride Derek.....
Cheers, Peter
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14th January 2022, 05:14 PM #4
I'm on for the ride too
The person who never made a mistake never made anything
Cheers
Ray
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14th January 2022, 08:44 PM #5
I will be watching this build.
A long (rail) road ahead.
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15th January 2022, 02:43 AM #6
Hope you all enjoy my journey as this is totally different for me.
I have spent the day in the workshop working on the frame no point in taking any photos as all you will notice is the position of the hold down clamps as I have now squared it up all around to the major sizes from now on bits will start to be milled out and holes drilled.
We did our weekly food shop and while out I treated myself to some storage boxes which I will be using to store parts in as I make them as I don't want to loose them after spending time making them. As you can see they clip together so can all be kept together
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16th January 2022, 03:20 AM #7
I did say this was going to be slow, remember that this is the first time using a milling machine and it seems to take ages learning the DRO as well as the feeds and speeds
The first picture show where I cleaned up the back edge and brought that to size as well as bringing it to length. It also shows todays work cutting out two steps there are two more steps to do. The second photo shows the curves that still need to be done but they will have to wait until I have finished all the drilling of many holes as they are being done by hand with a file. I think I spent more time double checking measurements than I did cutting metal.
I think it will become easier as I go along.
At the end of each day I have to wind the table so that the cutter is centred exactly over the bottom left corner this makes it easy to pick up tomorrow.
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16th January 2022, 08:11 AM #8
Might be slow progress Derek but way better than a full remake....
Be kind to yourself as you learn the new machine and enjoy the process.
Cheers, Peter
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16th January 2022, 07:53 PM #9
While making holes might be boring you will soon learn the drill.
Yes there is a lot of time involved. Always worth measuring multiple times. It is very easy to under estimate the time needed for a project like this.
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16th January 2022, 08:50 PM #10
I knew the learning curve would be long and slow but I will plod along take it easy and hopefully get there in the end. I am sure there maybe some remakes along the way but not on this big piece fingers crossed
Plenty of holes and all different sizes some only in one side so must remember to keep my eyes on those and the ones that need reaming
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17th January 2022, 05:06 AM #11
Most of the metal now removed but still need to make cut outs for the horns as well as the cylinder before the drilling commences. In the photo you can see where I have made the cut out along the top and bottom as well as on the left hand side this job took quite a long time as it was a good 10" cut.
I have had to only do a few hours as Saturday's I cook dinner for my good lady to give her a day off from cooking as well as today cooked some scones so we have been stuffing ourselves with scones jam and clotted cream known to many as a "Devon cream tea" and no pictures as they have now disappeared "Honest gov it was not me that ate them"
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17th January 2022, 09:28 AM #12GOLD MEMBER
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Derek,
I have found with my milling machine - slow feed speeds get the best results. Time it takes is a bit frustrating but gives a better end result.
Love your posts.
Regards
Keith
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17th January 2022, 08:25 PM #13
I found a nice speed speed which gave a nice finish like working with wood you tend also to get use to the sound of the machine and cutters to know if you are pushing them too hard.
It did make me wonder if I should have brought a drive for the X axis, I sat on my stool while winding the handle the only thing missing was a cup of coffee
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19th January 2022, 03:09 AM #14
Spent the last couple of days drilling and reaming holes as well as the piston cut out. I just seem to spend more time with a pen and calculator making sure I get everything in the right place. Only three more cut outs to do and then a little bench work before these frames are complete oh and 5 holes which I have only just started into the frame in the second photo these just need to be drilled through as they are only in one side.
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This is the Rob Roy that I am building it was in two colours first the were in Blue and later when they were taken over by British Rail in Black livery. This is so you can see what I am taking on
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19th January 2022, 09:24 AM #15
Woo-who, I can't wait to see you riding the rails Derek on yours now....
Cheers, Peter