Old School Drawing Exercises and 2D CAD

And my version on Fusion.

Whoops, only 4 spokes, a mistake taking seconds to fix in parametric CAD:

I seem to have broken the Learner Barrier - only took a few minutes to fix the S shaped spline, loft a spoke, add a hub, rotate 'n' copies and do the rim. Not as nice as Jason & Gary cos' I didn't bother to add fillets, which is rather easy.

Jason's spoke is also finished as a pattern with roots.

I'm supposed to be doing something else!

Dave

Whilst convalescing I came across this thread, very interesting indeed but way over my head.

I am very grateful for the amazing work that Jason has done for me of late, I started on the Brayton model way back in 2004. It’s been a mainly off and on type of project but with Jason’s help I’m nearing the finish line now.

The flywheel has been cast and is ready for machining, just waiting for my number 2 son to get his 8-1/2” swing Le Blond up and running. I have a few pictures available but don’t know how to post them here. The model is really taking shape now putting all my equipment to the very edges of their capabilities.

The cylinder head photo, recently posted, shows the inlet valve to the left hand side with a very simple exhaust valve on the right. The inlet is mechanically pulled open to allow the fuel and air mixture, at around 60 PSI into the cylinder which will be ignited by a pilot light ( that’s the original method ) time will tell as to what I will use eventually. The inlet is then mechanically closed to allow for the expansion to occur. Just like a two stroke the exhaust is opened at TDC for the downstroke. The cycle then repeats. The top side of the cylinder is the air compressor. The fluted column is the air receiver.

Please feel free to ask any questions about this project, because of the many other “ Irons “ in the fire might take a little more time to finish.

Cheers Graham.

Afternoon sir, you need to create an album and then insert the photos into your post, details here

There are some wonderful puzzles and geometry exercises in this thread, such as the multiple Ying-Yang shapes and that lovely sun-spoked flywheel!

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Everyone else here has learnt alone to be a very skilled creator of 3C CAD models in order to make things from their projected drawings - by conventional or CAM methods.

I have learnt TurboCAD to a basic but useful level; but not touched it for some months now, nor indeed tried to re-assemble my prematurely-dismantled drawing-board.

Learning's diminishing-returns law means I can identify my natural limit for CAD as essentially just accelerating my drawing on paper, but least CAD doesn't cover the place in eraser "swarf".

I failed with Fusion 360, Alibre and SolidEdge CE; but have up-dated my copy of TurboCAD, which has three advantages for me:

- 1) Honest, single purchase, very reasonable up-front price; no sneaky "subscriptions" months later.

- 2) A CD-mounted, pdf. introductory manual, not a wretched video of a professional user showing off.

- 3) Direct 2D/3D option switch - with a very important proviso that you cannot switch in mid-drawing.

(Apparently that option does catch beginners, because it is horribly easy to switch mode by mistake, producing irreversible difficulties.)

Its main disadvantage is an appallingly weak, incoherent, on-line "Help" manual with no real index, very hard to search for what turn out at best, only prompts for expert users.

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My main project, a 4-inch scale steam-wagon I should have completed years ago, has no drawings. I have only some photocopies of 1908-dated advertising material with photos of the prototypes, of which no two were exactly alike. I wanted CAD to help me design the remaining parts; but unable to use it to its best, I use it less and less often; and then orthographically because my 3D attempts are of no practical use.

It is easier to use the vehicle itself as its own "drawing" - measuring the metalwork so far, to make rough pencil sketches of the next bits; but still keep having to modify or replace parts made months - even years- previously!

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I still admire the skills of those able to draw to the standard illustrated on this thread, or published in the magazines' construction series - I just wish I could do it too!

It seems that my tablet couldn't handle the task. Here are a couple of photos of the Brayton Ready-Motor including the lovely flywheel casting that weighs a little over 30 Kgs.