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So I am having a moment: why is this your own design not a reproduction (possibly scaled) of the original Stuart Design?
I think scaling dimensions or blending curves are not sufficient to get round copyright law .I'm sure Jason will let us know why his is different Jo
Quote So I am having a moment: why is this your own design not a reproduction (possibly scaled) of the original Stuart Design?Well that is the section of the forum I have put about 15 other engines in where I have built my own version. So why kick up a fuss now?
Don't see you suggesting to the likes of Julius that he is getting round copyright when ever he posts a new set of drawing and makes them public, at least I'm just designing for myself.
Quote from: Jo on March 25, 2023, 06:50:04 PMI think scaling dimensions or blending curves are not sufficient to get round copyright law .I'm sure Jason will let us know why his is different JoJo, Are you suggesting that every builder of a scale model, of any type, is potentially in breach of copyright law?Mike
P.S. I cannot see Stuart being fussy as the progress casting set is so cheap
Quote from: Vixen on March 25, 2023, 08:03:05 PMQuote from: Jo on March 25, 2023, 06:50:04 PMI think scaling dimensions or blending curves are not sufficient to get round copyright law .I'm sure Jason will let us know why his is different JoJo, Are you suggesting that every builder of a scale model, of any type, is potentially in breach of copyright law?MikeI am suggesting that if you take an existing set of model engine drawings and scale it, even taking into account standard material dimensions, you cannot claim the resulting drawing set as your own design, copyright law requires that you at least acknowledge the origin (ownership) of the design on your drawings. JoP.S. I cannot see Stuart being fussy as the progress casting set is so cheap
I think we are digging a hole here. ...snip...Jo
As I understand it, Jasonb has taken an illustration of an existing design as a basis, and produced his own design that is intended to have a similar appearance. I can't see any infringement of the forum guidelines.
A reprint of the booklet mentioned in the above catalogue extract is still available from Tee Publishing and covers all the engines in the range with building notes as well as drawings so that is what I started with. As with my other recreations of long lost small engines I set to and redrew it in metric with a 12mm bore and 20mm stroke in Alibre, exporting some parts to F360 to make use of the CAM function to generate the G-code needed for the CNC mill.
I cannot see Stuart being fussy as the progress casting set is so cheapP.S. The last sets of Progress SH castings I saw sold for sale were £25 each.
So Jo where did you see this £25, was it from Stuarts as your first statement the use of "IS" suggests they are still sold yet the second comment suggests you saw some second hand sets for sale?
Or more precisely a replica of the Stuart Models "Progress SH"..... snip... This shot shows the results of an adaptive clearing tool path that leaves a series of steps on the sloping surfaces as they all have a draft angle to mimic the casting and one of the finishing paths has just started to work it's way down around the near bearing block boss....snip...
I'm not sure what the next small "replica" will be as I'm running out of subjects to do though I expect something will crop up on the web and catch my eye. Something else ran for the first time this weekend so keep an eye out for details of that though I don't think it will be a build thread.