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Beefed up the spindle.

Then simplified my x and y axis to the more traditional setup.

Wow the previous unconventional setup is a lot stiffer than the conventional.

This time even though the...

Did my first full simulation using HWIN 35mm rails.
Optimised the rails and cars first.
Then attached them to the frame.
Reduced the steel and size.

I wanted to see what total stiffness I would...

Yes most of the Haas machines are under 5000 kg and these figures are the shipping crate figures so the actual weight of the machine must be a few hundred Kg less.

CM-1 950 kg
DT-1 2336 kg...

Added the bolts, it is still 500N/um because when you add the force to the 3 faces you effectively constrain them together.

The thermal analysis was excellent because all the distortion is on the...

Well I seem to have cracked it

This is the torus with 2 steel plates either side.

Simulated as just stuck to the concrete using regular adhesion giving 500N/um Stiffness.

I know from my...

Well surely the correct approach would be to carry out thermal and vibration analysis compare the max deflections to the max deflections caused by machine forces, and if they are less then it wont be...

I'm confused as to your statements on vibration and thermal issues with machine. What is it about a Hobby machine that makes these effects insignificant? Do you have any data or one of your thousands...

That's interesting, would love to see one of your 150N/um designs, what sort of machines were they, C shaped? Gantry? How did the FEA predicted stiffness vary from the actual stiffness? how much did...

Refined and checked the mesh, the 1 cubic meter of concrete shaped as a Torus is actually 125N/um stiff.

I've attached the step file for anyone who wants to check the simulation in their FEA.
...

I think if you did some research you will find that concrete is 20 > 25 GPa in bending and if you treat it like any other material and work with it's actual properties and not the properties you...

Here's a concrete only frame, no steel that can do 100N/um and is only 1 cubic meter of concrete for a cost of $108.

The inside circle diameter is 800mm so if your spindle post is 300mm you would...

If I had to machine accurate parts in an apartment I would go the EDM route, especially for gears.
You don't require any stiffness, basically a 3D printer in a fish tank.
You can get or make your...

Here I discovered the best way to attatch rails to the concrete.

If you constrain both sides of the concrete with through bolts, then the force constraining opposite sides will be equal, so you...

This video was posted by Jack on my thread about using concrete in machines.
What he says about keeping symmetry works, if you keep the same amount of steel both sides of the concrete then there is...

In case anyone is thinking of going down the 300x300x28mm box section of aluminium with 35mm steel rails rabbit hole then you might want to reconsider as you will get deflections of up to 0.2mm on...

I have been doing FEA analysis on this same design. Looking at thermal distortions from using steel on concrete.

I would recommend you do the same, simulations like the machine is warm from...

Did thermal analysis of shapes.

Made a simulation that simulated the concrete being at the max possible temp where I live, then the air temp around it drops to the minimum possible temp where I...

The concrete on steel was giving distortions that would stop you achieving the accuracy of a 100N/m machine, I predict the heat distortion from aluminum on steel would be more than the distortion...

No it doesn't, see attached pics it costs $130 cubic metre there and here it costs $108 a cubic metre

Don't make me waste any more time checking your error prone calculations, like the time you...

This is just arguing over semantics, they were using weaved mats before, it's obvious, to sane people, that they just cut out some steps from the existing process. I think everyone here has wrapped...

Here's a primitive poverty stricken outfit that didn't take the red pill on how to use fibers.
Still weaving away with his primitive mats.
They are going to be out of business soon if they don't...

Not weaving a mat at all, any resemblance to weaving a mat is purely coincidental.
What we have here is a machine throwing down pieces of fiber into a random mix.
It's not weaving anything using...

Whom am I going to believe you, or my lying eyes....lol......anyone watching that video sees a machine laying down threads in patterns like the spindle does on a sewing machine. I would be keen to...

Do the math.

500 x 500 x 1000mm = 0.25 cubic meters = 2.5 bags of cement which is $(US)15 here plus 5 bags of sand and 5 stone $20

300 x 300 x 10 x 1000mm is 91.2kg of steel which is $(US)...

https://www.youtube.com/shorts/JheQe24xtB4

They use multiple single strands on a roller as seen in this video, literally a giant sewing machine knitting a mat directly onto the part, aint nobody...

The real DIY costs, I can get concrete delivered in a truck for the trade price, but the price I used is what it costs me to hire a mixer and vibrator and the cost of the bags and sand and stone....

I am comparing apples with apples, any machine made using the usual 250mm x 250mm x 10mm steel column ends up with at least a 1m x 1.5m base after they weld all the stiffners and supports on.

I am...

Was tempted to do the same myself, but a manual machine that could do steel.
If finances are tight and you just need to machine parts and not join a CNC cult then this is the smart thing to do.
You...

Meanwhile back with the thermal analysis of the sections of concrete and the plates attached to them continues.

After seeing the stress maps from the concrete v steel analysis I can see that the...

Incorrect the fibre used in aircraft and boats is woven mat that already has incredible tensile strength from end to end before any resin is added, the same way that the reinforcing in concrete has...