Hi, i agree about the reality thing and all comments. So i could have shimmed it easily. However it would not be woodworking machine only or mainly... If this was woodworking machine only i would have finished it already.
As i said before, one of the main purposes of this machine will be to surface under the rails smaller machines + surface gantries and Z. I don't have a mill, no money for a mill or place, so have to be clever and have good CNC capable of doing similar jobs in aluminum. So basically this machine will cut mainly aluminum , plastic and when nothing to do - wood. It will have mounted plasma torch and removable water bed 100mm deep, something like 1 square meter, so i could plasma cut some small parts. Yeah, one of the things that i will do in the future is make small machines by order or at least the important parts for them.
Hence the precision desired, required or dreamed of :-)
Will not change the WS epoxy, now that i am deep in it, to say. Will order another B pack. One more try and then will shim if unsuccessful. But i have to know. Can i or not make 5x10 machine using this method. Thats the real question.
In other words i am having fun. Now that i know that i can shim it. Plus i know that if i waste a ton of epoxy and make 5 bridges or additional long parallel bridge in the middle and interconnect all it would work, cause will simulate 4 small machines cast together. But where is the fun or the excellence in doing it like this. I want to find how with minimum effort will make the best result, its difficult to explain.
See below. Thats how i am thinking of to make the next try. bridges both sides only, no middle. Steel, soldered when dry rails mounted then rests carefully cut by hand . 200mm extension, so if anything bad happens it will be there. Rails will suck this time from the bridge, not like before. 140mm reservoirs extension, i cant explain, seems right to me. ~2.5 - 2.8kg mix/ 40mm wide -45mm wide channel/ .
Previous pours showed that rails length seems don't impede flow at this width and depth/ 5-6mm/ so only 2 bridges both ends. In fact i am almost 100% sure that could be done only with one end bridge, all seems so right, but i don't want to experiment right now with this.
What do you think?
http://www.mycncuk.com/attachment.ph...id=13621&stc=1
PS. about the frame
Yeah i am conscious about the possible misalignment of the machine if it is moved on another premise. But hey, even my small lathe manual says that below should be perfectly flat and horizontal to achieve working accuracy. Its considered when designing the machine to be made so that this is irrelevant. Thats why the triple beams /100x100x4/ both sides-against bend in the middle , that's why the 3 double horizontal beams on bed -against twist. Also that's why the 4 legs are both ends and not say 20 percent inside, cause right now the frame bent what have to bend and combined with the sides and bed strength it will not bend more under 140kg gantry, in other words the gravity stress will work for me. Cause if i have put the legs 20% inside the frame length both sides so the frame would be strongest, when the gantry went one side it would lighten the middle and cause some vibrations.
So the answer is that when moved, legs must be leveled checking long rails against straight edge and even additional supports mildly fixed in the middle so they support, not push up. I told it before on the first build. Speaking about this and that but if you don't have the precision instrument to measure it... IMO a straight edge that could extend perpendicular to both long rails tops is a must for any precision build. I don't see how could be done without this.
