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[WoodKnot]

Are all your profiles 40x80? I tried to catch up a bit and went back in history to try to figure out what you actually bought for parts, but to be honest, I failed. I don't know which parts you bought, or if you just bought a drawing or a complete kit with some modifications of your own. Somewhere else you posted a link to this machine from cnc4you:



Is this similar to yours? Now, I have no idea about the dimensions here, but it looks like mostly 4x120. As you can see, the BK/BF of the X screw is placed over one groove, the picture shows clearly that the BK/BF is fixed through drilled holes in the extrusion between the grooves. That is also possible to do as a solution, but if you have only 40x80 all the way then you have bigger issues. Anyway, it is not clear to me at this stage what you actually bought, how the parts are meant to be installed or what the actual problem is, other than the fact that the BF/BF won't fit into the grooves. In any case, if 45x90 is not working, perhaps 40x120 would work. It adds some costs, but surely, not nearly as much as £800 because I am pretty sure you could save and use most of the stuff, depending on the design. Never the less, it would be a good idea if you posted some pictures, it would help a lot in the discussions. Anyway, if you buy new extrusions I can recommend you buy it from DOLD Mechatronic. They have good prices and fast delivery. Some extrusions won't cost you an arm and a leg, and you can easily cut them in your workshop.

I think that the 20 rails are MUCH better than 12, which in my opinion is only suitable for 3D printers, so in my opinion that's a good choice. I also think that using a smaller than 1605 screw is not a very good thing. 1204 may work, but not on such large machine. I am using 1204 on one of my 3D printers. 8 mm ACME is a joke for this sort of thing, it is suitable for 3D printers, but not a large CNC.

If I were you I'd try to make something out of the parts you have, even if in the end it will take longer time. What's been said several times and in several forms is that you must make as a minimum, some sort of plan on how you want the machine to look like. If you do that in a CAD software, that's fine, but it is my understanding that you don't want to do that, so the absolute minimum is to take a piece of paper and a pencil and start sketching, measuring and making drawings. I think Jazz misunderstood my comments, because it sounds like he thinks I am against using software, which I am not. In fact, I do use several, but not for machine design and machine assembly simulation. Even though I am not using any machine modelling software, the mistakes you made would never happen to me, not because of CAD or no CAD, but because I do read specifications, look at technical and mechanical drawings, check dimensions, make sketches and measurements and so on. I think that it is ABSOLUTELY necessary that you do that as well, otherwise your build will be extremely expensive and may end up in the garbage if you just ignore things and assume that it will work out somehow. I don't know what sort of things you have made before, but you seem to have a very large and luxurious workshop, especially compared to mine, so surely, even if you only worked with wood before, you must have made many drawings for whatever you made. I am not a wood worker, and my last wood project was two very simple birdhouses, but I made drawings even for those before I bought the material and started cutting up. So yes, drawings are VERY important according to me, but machines were made long before CAD software was invented, so that is not necessary at all. The type of table CNC we normally build is actually a pretty simple machine compared many others which can be made without and CAD software, so that is not required, but careful measurements and drawings are definitely necessary.

Thanks A Camera

The profiles that virtually everyone on OpenBuilds is using is this - https://ooznest.co.uk/product/c-beam...l-cut-to-size/

A lot of guys in the US purchase from them in the UK.

Never used a drawing for anything i have made.

I measure the dimensions of what i want to make and where it is going to go and then just get on with making it.

So, i need to make a bookcase for an alcove -

Height, width, depth, height of books from large to small, thickness of material being used, allow for rebates etc - all just written down as physical sizes. No drawings

I look at other designs, profile edges, create radius corners, all based on what i think looks aesthetically pleasing!

I will make use of most of what i have - but the ball screws are to short and will cause an issue as they are the exact length of all my profiles.

Were as the others are oversized generally by 40mm or greater to allow them to pass through the plates and be secured.

WoodKnot