neilkirby Posted April 16, 2020 Share Posted April 16, 2020 Hi, Last year I bought a Hornby Sentinel diesel cheap. I was struck by how similar the basic diamensions were to it's S&D grandfathers, so I thought about a conversion, out came the razor saw and Plasticard. I made a basic cab, but stalled on how to form the main part of the body. I recently picked up the project again and over the few weeks I have been putting together a cad for 3d printing. I started with just the basic shape intending to add the cab and details with plasticard. but got a bit carried away. I not certain it will fit my stripped down Hornby chassis, if it does the wheelbase will be 2mm over. Someone elsewhere suggested that I mount it on a HighLevel QuadDrive. But I will try and get it onto the Hornby first. . I will post again when I get the samples back. Regards, Neil 11 Link to post Share on other sites More sharing options...
RMweb Gold simonmcp Posted April 17, 2020 RMweb Gold Share Posted April 17, 2020 Looking great Neil, can you tell me what CAD program are you using please. Simon Link to post Share on other sites More sharing options...
neilkirby Posted April 18, 2020 Author Share Posted April 18, 2020 I am using tinkercad, It's very easy, this is the first thing I have ever drawn. The test print arrived yesterday, and looking at that it taught me a lot about how to design for printing. Regards, Neil 5 Link to post Share on other sites More sharing options...
RMweb Gold simonmcp Posted April 19, 2020 RMweb Gold Share Posted April 19, 2020 Thanks for the reply. Simon Link to post Share on other sites More sharing options...
neilkirby Posted May 16, 2020 Author Share Posted May 16, 2020 Further to my earlier post I have done some more work to the Sentinel CAD, (thanks to Roger O'Neil for loan of official drawing) I have now designed it to (hopefully!) fit the High Level QuadDrive chassis. I have taken some of the details off the main sub assemblies to be separate parts. and also drawn the side frames. Only things left to do are cab steps & brake gear, but I will wait for the chassis to arrive before I start that. 9 2 Link to post Share on other sites More sharing options...
neilkirby Posted June 7, 2020 Author Share Posted June 7, 2020 (edited) Hi James, See below for a view of the updated CAD, and two photos of the secondprinted prototype: Regards, Neil Edited June 7, 2020 by neilkirby 9 Link to post Share on other sites More sharing options...
wainwright1 Posted June 16, 2020 Share Posted June 16, 2020 Hi Neil. There was another one of these called Joyce which was based at Waddon Gas works I think and is the one preserved at Shillingstone masquerading as an S & D one. It had some differences, with round spectacles and a little thing above the front buffer beam. RT Models may do a chassis which fits this. All the best Ray 1 Link to post Share on other sites More sharing options...
neilkirby Posted June 16, 2020 Author Share Posted June 16, 2020 (edited) Thanks Ray, I have stood on the footplate of Joyce, and chatted with the owner when I visited the S&DRHT at Midsomer Norton about 3 years back. Which was long before I thought of doing this. IIRC he has his own website on which he lists the differences between Joyce and her S&D sisters. This week I have been doing some work on the Cad and think I have sussed out how to fit a High Level QuadDrive22. I gave the file to my mate with the Mars only a couple of hours back. Life would be so much easier if I already had the Saturn I have on pre-order. I have also worked on a bit more detail, adding the split & hinges on the access panels either side of the cylinders. I have also changed the cover over the chimney (or is it just the boiler exhaust?) as I can see something different to what I had is going on there. but with just a couple of blurry pics which are both at quite a low angle it is difficult to see what exactly, also pretty sure that it was different to Joyce. so just a best guess. Here is the latest CAD: Regards, Neil Edited June 16, 2020 by neilkirby Typos 6 Link to post Share on other sites More sharing options...
wainwright1 Posted June 17, 2020 Share Posted June 17, 2020 Hi Neil. No plans for Joyce then ? Have you got Brian Cox advising you on the planets ? All the best Ray Link to post Share on other sites More sharing options...
neilkirby Posted June 17, 2020 Author Share Posted June 17, 2020 Hi, I don't think Joyce would be too much extra work, from memory the round cab windows and 'the thing' in front of the bonnet, that you mentioned. Also rounded lower cab back instead of angled. beading around the cylinder access plates, coal hatch both sides instead of just left. but then again. I still don't know whether this project is just for me, or be available to others. I have Holst advising on planets but seriously they are models of 3d printer made by Elegoo, with the Saturn being a new bigger version of the Mars. Which I very nearly ordered a few weeks ago before finding out more about the Saturn . Regards, Neil Link to post Share on other sites More sharing options...
wainwright1 Posted June 18, 2020 Share Posted June 18, 2020 Hi Neil. I would certainly like a Joyce, if that ever happened. With these new machines, do they offer a greater range of materials that can be printed ? I know that there are various types of plastic, nylon, resin and even metals that can be used, although I suspect that some of these are only suitable for top end machines. Then there is what is being used to produce the S.E. & C.R. vans for Rails, which I believe is a new type of material. It all gets beyond me. All the best Ray Link to post Share on other sites More sharing options...
neilkirby Posted June 21, 2020 Author Share Posted June 21, 2020 Hi Ray, I make no promises, but to keep doing something whilst awaiting my 3d printer to be delivered. I had a play at modifying the CAD for Joyce. and came up with the following: It's suprising, but the more you look at photos of the real things, the more differences you spot from the Radstock twins. I still have work to do with the chimney, and two things that are slightly different which I won't be changing is the depth of the step in the footplate & the profile of the cab roof, as both of these would mean nearly starting again from scratch. (the Radstock engines had a deeper step). Changes made so far: Curved rear cab Coal hatch swapped from left to right and size & shape changed Beading and clamps on access panels Cab windows changed from square to round Adjusters on axleboxes changed from back to front Buffer spacers taken out and heads increased in size Front bufferbeam raised Cylinder mounting now showing through bonnet front plate New whistle Cab roof vent removed Lamp irons changed (may still have to lower the front one) Cutouts in footplate above sanboxes removed I think that is all, unless anyone knows of something I have missed. Regards, Neil 2 1 Link to post Share on other sites More sharing options...
wainwright1 Posted June 22, 2020 Share Posted June 22, 2020 Hi Neil. That is very interesting and it is amazing that there are so many differences between the two types. You would think that Sentinel would produce their design and apart from a few things, like perhaps the spectacle shape and sandbox access which the customer might specify, they would be otherwise standard. Keep up the good work. All the best Ray Link to post Share on other sites More sharing options...
neilkirby Posted June 22, 2020 Author Share Posted June 22, 2020 (edited) Hi, Chimney and damper plates now done (dampers both opened and closed): although whether they will print sucessfully is another matter! Regards, Neil Edited June 22, 2020 by neilkirby 1 Link to post Share on other sites More sharing options...
wainwright1 Posted June 22, 2020 Share Posted June 22, 2020 Hi Neil. Attention to detail exceptional. Must ask, do you have scale drawings or are you getting all this detail from photographs ? All the best Ray Link to post Share on other sites More sharing options...
neilkirby Posted June 22, 2020 Author Share Posted June 22, 2020 I have a scale drawing, that was lent to me by someone after I posted the 1st version of the cad. The plans do not show much useable detail, I have gleaned most information from photos, both online and from books Link to post Share on other sites More sharing options...
neilkirby Posted November 15, 2020 Author Share Posted November 15, 2020 (edited) Hi all, I finally received my Elegoo Saturn last week, and am currently a a quarter of the way through a print. There have been a few changes to the CAD since I last posted. Fingers crossed that I wake up to a good print. Neil Edited November 15, 2020 by neilkirby 8 2 Link to post Share on other sites More sharing options...
RMweb Gold JCL Posted November 15, 2020 RMweb Gold Share Posted November 15, 2020 That looks fantastic. It will definitely be interesting to see how it turns out. Out of interest, are the lamp irons included on the print? I’ve generally shied away from printing those, but if yours turn out ok, I’ll give them a go. Link to post Share on other sites More sharing options...
neilkirby Posted November 16, 2020 Author Share Posted November 16, 2020 Hi, Lamp irons are on, some have broken off the prototype, but these were done on a friends printer some months ago using whatever resin he had in it, which was quite brittle, I have used the 'ABS like' resin and there seems to be a little bit of give in it, But whether it stays like that when fully cured, who knows?! It they do come off, they should trim down with a sharp blade so nothing lost Regards, Neil 2 Link to post Share on other sites More sharing options...
RMweb Gold JCL Posted November 18, 2020 RMweb Gold Share Posted November 18, 2020 Thank you. In that case, I'll have a go with mine and see how I get on. As you say, they can be pared back. Link to post Share on other sites More sharing options...
neilkirby Posted November 19, 2020 Author Share Posted November 19, 2020 Whist waiting for yet another Sentinel test print last night, I thought I would see what the CAD looked like 'Coloured in'. Regards, Neil 5 Link to post Share on other sites More sharing options...
PenrithBeacon Posted November 24, 2020 Share Posted November 24, 2020 Are you intending to retail these? I'd certainly be interested in buying one if you do. Cheers Link to post Share on other sites More sharing options...
neilkirby Posted November 24, 2020 Author Share Posted November 24, 2020 Hi, Originally I started this as a single part to help with a scratch build just for me, and got a bit carried away. But as i have had a fair bit of interest, and if I can get them to print to a standard I am happy with, I will offer them, Also I have provisionally worked at modifying the CAD for 'Joyce' Regards, Neil PS the IF part is a big if after yesterdays fail, I seem to be getting further away from a good print, but then again I have only had the machine for a couple of weeks. 1 Link to post Share on other sites More sharing options...
PenrithBeacon Posted November 24, 2020 Share Posted November 24, 2020 I don't have a scanner anymore this is from one of the Bradford Barton books on LMS locomotives. 1 Link to post Share on other sites More sharing options...
cctransuk Posted November 24, 2020 Share Posted November 24, 2020 53 minutes ago, PenrithBeacon said: Are you intending to retail these? I'd certainly be interested in buying one if you do. Cheers Me too - please PM me if they become available. John Isherwood. Link to post Share on other sites More sharing options...
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