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OK I removed all the ugly cross bracing I added and left it as built solely from equilateral pyramids of 500mm.

What matters is mounting your 2 sets of rails on 100mm OD 10mm thick pipe the other...

Changed 2 pipes with the rails on for 100mm OD with 10mm wall thickness and almost doubled the stiffness.

This frame shape performs best, if I remove any of the outer pipes then there is a...

This is with adaptive turned off and with capture curvature and proximity turned on, which increases the mesh where 2 elements connect.

I've noticed the better your meshing gets the less the...

Without these animations I wouldn't be able to optimise as easily.
They show you where the weakness really is.


OMG the 2000's called they want their video posting software back.

I used 5mm thick pipe 50mm OD in the highlighted sections and 2.5mm thick everywhere else.

This one is for the MESH POLICE....lol

This is giving 50N/um on the X-axis with bang on 1000kg of steel but 100N/um plus on the other axis.

Finally can make quick changes to whole sections of...

I like your use of top hat sections, they give you better rigidity than the same section in square tube, after they are mounted to whatever you screw them down to, box section means you have to mount...

What's your Scoot machine?

Or you could just upgrade to ANSYS :P

Here's one where one of the tubes has 3 divisions through its thickness.

I just manually calculated the stretch to be 7.94095 um using the structural steel with a modulus of 2e11Pa and a diameter...

I get the following results with my default mesh.

Tried a lot of different custom meshes the results always came out the same, got me thinking about what steel you used?

I think it could be that the OD of a 40mmNB pipe with 5mm thick wall thickness is not 45mm OD as you used in your calculations.

I think you made an error in your calculations.

So a truck stand is just as effective if the lengths are unequal? Of course not, if you want equal stability in all directions it has to be equilateral.

And after you designed your space frame in...

The cost of the cheapest Fusion license is 150% more than I pay for unlimited internet at 500mbs per month, so that is never going to happen for a hobby software tool. If I wanted to get commercial...

No kidding...lol.....the problem is a development one, 517 pieces of pipe to mesh takes more time to set up as a single contiguous mesh than the hour and a half to solve using multiple connections. I...

Not too bothered about the actual shape, just looking for the stiffest design in the space available, I'm maxed out at a 3m x 3m base with a 2.5m height
Now that I have the software and memory...

Spent 2 weeks on software issues, switched over to beam modelling. OMG! if the topic itself wasn't such a mindf$$k then the bugs in the software will surely fry your brain.

But never the less I...

Took my FEA game up another level, upgraded my memory to 64G and my CPU has 8 cores running at 5Ghz with 2 GPUs.

Looks like a frame that is 100N/um stiff with less than 1000kg of steel is...

Anyone thinking of following this route, let me save you a lot of time. You need to decide your base structure then know all its dimensions before you start off or you will never get it to pass FEA....

Had a great career in aerospace, I am sure it will help me immensely :)

Managed to get 2 Chinese lasers good for 60um line width instead of the 40um of the greedy Americans for a 10th of the price. I am sure with good cameras instead of that 2B pencil stuff industrial...

Following Moore's law with my designs. Had a look at Space Frames came up with this metal crushing monster at 185 N/um with 2 tons of steel.

Definitely going to go this route, love the...

Well it looks like static machining will soon be gone.

While getting my laser stuff ordered I see that you can purchase for $1000 a laser that can project a plane at under 750um thick out to 2m
...

what is the closest diameter to 1.7mm with a soft spooled wire ?

If I use such a small diameter wire welding 15mm thick steel plate then it will just have to feed faster, correct ? or will so much...

Thanks for the info, unfortunately I am having to use the welder to first weld up the machines frame with structural steel, not Aluminium.

What would be a good wire to TIG weld structural steel I...

I feel confident to build this without too much hassle. The reason being is you only have to make one perfect jig and then it will work.
I always make jigs, they always work really well. Any machine...

The answer is pre-stressing and symmetry. This is how it is done with concrete.

You have a bar of metal close to the surface at the top, and a bar of metal close to the bottom.

You pull them...

You can upgrade it endlessly.

You can put a large bed on it and use it to machine sheet or plate. Or you can put a small bed on it and use it to machine upto 500mm Z axis.

I am already gearing...

Went back to the drawing board, clean sheet.

I wanted to work out geometrically and structurally what was the strongest shape I could fit in the space available. Went and measured my workshop...