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@Metiz the rest of the geometries have been calculated the same way, so I'll trust the software, verifying the ID's as I go... One more look over the scaling so and I'm ready to cut metal 8) I just tested my sheet roller too, it works like a dream up to 75mm ID, so that should get me the majority of...

Well to take an easy example from my folder above, 0009 Therm 5 has a combustion chamber ID of 100mm, OD of 101.8mm. If we take the circumference at the ID, its 314.159mm. At the outer diameter its 319.814mm and through the neutral axis is 316.987mm... Solidworks lists it as 316.1mm??? So where does...

So I was reminded I had investigated this same matter previously, with the package Solid Edge. SW uses either gauge tables for various thickness materials with the same bend radius, or uses the K factor of a given material to compensate for stretching/compression either side of the neutral axis. In ...

Ok ok, after some quick googling and circumference calcs, it appears Solidworks may compensate for the 359 degree revolve and it looks like the thickness of material. An example is on my drawing linked above titled Thermojet 5. The inlet pipe has an internal diameter of 44mm, so an internal circumfe...

I have made the critical dimension as the ID, so the thickness of my material is additional to that. Solidworks then generates the flat pattern from that 3d model. For example, I could change all the material thicknesses across the entire model, and the internal diameter would always stay the same i...

Apologies Metiz, I was so excited about the deal I forgot to check the spelling of your name :D All the dims I have been dealing with are internal dims, are you saying I should add additional width on to the dimension of the flat pattern, based off a part modelled on the ID? I've never had to work s...

@ AlexanderAndrosov thanks for that, that looks like the stuff I was after! @ Matiz, and others, I need to know if I'm picking the right PJ's for starting to intermediate difficulty. My previous employer has given me a quote to supply me with a 3m x 1.5m x 0.9mm sheet of 304, INCLUDING laser cutting...

@ matiz Thank you so much for that excellent advice. Obviously I want to not just throw money at this hobby unless I'm at least reasonably confident I'm buying the right stuff. What diameter wire would you use, 0.6 or 0.8mm? The nearest scrapyard to me is over an hour away, and they tend to crush ev...

@matiz thanks for your prompt and informative response. "Effective length" and "mean diameter" are terms I saw for working out thrust estimations, I was simply exploring that calc for what it is, a very rough estimation with a great degree of error. I was wondering does the mean of all diameters inc...

Hi all, Some questions: 1. Does the mean diameter for calcs include the exhaust nozzle large diameter (at the wide end) 2. Does effective length include the length of the exhaust nozzle? 3. I am looking to build the original Lockwood hillier design, but where the hell can I get stainless pipe 76.2mm...

Hi All, I have questions, some of which I am aware of answers to, but I would value experience over all else in the answers I seek, so I will do more searching of the forums to make sure it hasnt been answered satisfactorily already before I post them here. A little bit about myself, I'm a mechanica...