On 12/15/2015 10:06 AM, Dave Cole wrote: > On 12/15/2015 2:57 AM, Rafael wrote: >> I was wondering what is the easiest way to make a T-slot aluminum based >> frame for CNC square? >> >> No matter how good is the cross cut, it never makes absolutely right >> angle in corners or T sections which causes problems with guide rails etc. >> >> Thanks, > > What you need to do is to get the cuts as close as possible and then > tweak things into shape and brace them via diagonals. > Aluminum is pretty flexible even as extrusions. IMO, alum extrusions > makes for a lousy machine base or frame for serious work. If accuracy > is not a big deal then its ok.
One would think, but when all major parts are made of the same material, it expands or contracts the same in all directions. Many CNC machines are made of extruded alu and they seem to sell well, well known CNC routers and 3D printers for example. > Welded steel tubing is much better and massive cast iron or heavy steel > embedded in concrete is best. The nice thing about steel/iron frames is > that if you want surfaces really flat, you can > put the entire frame onto a massive mill bed and face off the frame > contact surfaces so they are very flat, true and at right angles. But > that costs $$. > > Dave Agree, but that's for big boys, much bigger than toys in my garage. Thank you guys for informative responses. I knew about 345 of course, and created flat surfaces on my small mill already but that still wasn't enough and made me ask experts on this list. It will take a while to digest all. You also gave me additional terminology to search under. Dave's suggestion to use laser is especially appealing to me now that laser diodes are so cheap and I sure have a right angle prism somewhere that could be used for this. -- Rafael ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
