Ok here we go again.
Today my X axis rail arrived from Germany.
Man this thing is HUGE. It weighs about 8 kilograms and is very very heavy.
Also, the linear ball bearing slide has (unfortunately) mechanical artifacts in the rail which make it not run very smooth.
So..... I allready settled with the ebay seller and the rail goes back. Meanwhile I allready bought another rail (this time 1400mm long) of the type THK RSR12WZM
This rail is a lot lichter (only 24mm wide and 8.5mm heigh) and the carriages only weigh <70grams
Still they are top quality (I allready have some of those here which measure about 30 cm, but its the same rail and carriages and I can really make them fly)
So its waiting again for that rail to arrive.
In the meantime, I have discovered
http://www.beltingonline.com/ to be a site to bookmark.
I found there that they have T2.5 AND T5 belt. I really wonder if T2.5 wouldn't be a good solution for me instead of T5, but that largely depends on some stuff I'll have to ask to beltingonline (mainly the fact that I don't have the tools to accurately make my own bore + grubscrew holes.
If I use 2.5T 20Tooth pulleys, then 1 rotation of my motor in full step would be 50mm.
The motor is 200 steps motor, so 1 full step would be 50/200 = 0.25mm
The driver (a CW5045 microstepping driver) can do 1/10 , 1/25 , 1/50 step to the 3.1Nm stepper so theoretically that would give me a resolution of 0.025 , 0.01 or 0.005 millimeter (where 0.025 is the default resolution of HPGL files which only work upto 1/40th of a mm)
Life looks nice again.
Unfortunately I also got the idea to begin to draw my machine in sketchup and that is not so easy at all
Therefore, the first thing I'm going to do now is read a good sketchup book