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Hi Peter, I have this in mind to use double tube design, if the cost is high and gain is low for a fabricated gantry, since anyhow I will have to stress relive them, and weld them, machine them.

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Same here :)

Hi Peter, sure I should do that, I will contact with them and show the design and ask what is required to make it safe for them, then I can confirm it's not effecting the stiffness by running...

Hi arden, I wish I could just pick 1 meter of a square pipe, problem is nobody around me or even far away of me selling it that way, I have to buy the whole 6 meters. that is why I'm trying to...

Hi Peter, would stich welding or drilling holes help with the trapped air ? Or it need to have big area for air to escape?

Hi Peter, yes I'm not trying to distract my self with many options, because I will never be satisfied, go with one and try to get the best out of it.
Yes I'm using Solidworks and it can do FEA, also...

Hi Peter, you are right I just thought it can help with stiffness, you already said if things are stiff enough dampening is not that big of a deal, so I will continue with steel fabricating gantry...

Hi Peter, I red throw all of it and it's interesting topic, did you check CFDST before ? Seems like it combine both of the advantages
Can it be simulated ?

Hi Peter, yes this is the best way but I can't do it


Using spacers or shims can cause a problem, I will have to add shims on the whole length, if I only add at the begin and end, the middle...

Hi Peter, how they making the surface below linear rails flat ? Machining it after casting, I couldn't get this yet.

Good design I will start to investigate the triangle gantry with linear rails and ballscrew facing front, having slots in the plate that make up the gantry improve bending as I know so it's better...

The main structure of the machine that is touching the ground will be steel tube table above it steel sheet that is like a box inside it the y rail supports will sit on 3 point of contact then I will...

It arrived, and i responded do it, not sure what is wrong with the forum, on my mac device i can't see past the 6th page, on my mobile device same, only on my windows laptop i can see them

Hi peter, I want to have a z travel similar to langumir one or Datron M8Cube which is about 200mm to 250mm max
If i go with 200mm, the spindle + smallest endmill wont reach more than 200mm but the...

https://i.ibb.co/HrKpRhX/flanged.png

And here with flagged somewhat similar to Datron M8Cube

It went down to 133/um stiffness

Hello Peter, i made a dummy machine just to do some testing on it, i attracted the step file because when i do simulation on solidworks, it's showing strange result, not effecting the whole frame of...

Hi Peter, I'm gonna use the machine for engraving on granit and wood, milling aluminum plates steel plates, but you are right I guess z travel should be more than 200mm
But to do that I will have...

What is the z travel in this model ? I'm thinking my z travel will be 20cm and bottom of z plate to bed will be max 30cm, also gantry will be 1 meter width supported by 10cm on each side so the...

Hi peter, I will start to use your simulation program, looking cooler than Solidworks, x Gantry can go up to 20mm thickness with the flange like langumuir and the 45degree bend on the top plate then...

Hi peter, i read your topic from start to finish and i get allot of good information and ideas, for me to machine the walls after fabricate from steel is hard, the way langmuir did it is the best...

Yes i will use your style of designing, build the machine as concept then finalize after i get the result i want.

Thank you peter, i will keep it incase i go with that route, Now i'm playing with the Z design trying to figure out how to do the simulation good on Solidworks, i just started to use it 1 month ago.

Hi peter, i'm here to get educated and get the info from good experienced individuals since i don't have that much experience, so i don't reinvent the wheel from the beginning.

Yes i will go back to z make sure it's stiff enough, then i move forward from there.

Hi peter, You have a point i should check about this, My problem is i'm not trying to build the whole machine based to be 1 part, so i don't have to machine it in 1 time, since i can't do that around...

Hi Peter langmuir design loadpath goes thru to steel bed to the almost 40 bolts acting as rebar then to concrete
So what is connecting the steel bed to the machine rails is the concrete as you see...

Flood coolant is an option that maybe I won't use so I will just have the drain for it til I wanna use it, epoxy is just at the machine bed not below the rails. Under the rails will be machined steel...

Hi peter,
About why i wanna use Concrete, langmuir used it, and since i'm copying their design so i'm going with it and here is the reasons why it make sense to me.
1. Concrete in my country is way...

Wow looks beautiful, this temp not changing the structure of the steel right? So it's staying at the same strength as it was before enter?

Yes all the parts that will be welded even the one that won't be welded still I'm planing to HT them all to make sure nothing move after machining, just the machine table that will be supporting the...