So how does it look now? here it is...

And where did we came from and how we got here!?

First time completed assembly and test the good old days (3 months ago)..

So lest take it all apart and start over...



Withe the double beam on the X-axis gantry there was a little parallel play between the back plate and the front plate holding the Z-axis. I solved this by adding HDPE pieces to form a solid block instead on relying only on the screws to prevent the parallel sliding of the plates from one an other. The double beam is probably too much for this size, I am experimenting as I will like to go wider later 1000mm or larger (why not), also get more rigidity on the gantry.






Almost there, also changed the Spindle mount.

some movement test...
now actually do a real test...
Now one of the things I want to use my machine for is milling PCBs. I have been playing around with different settings trying to get a good hold in accuracy and repeat-ability. I am using single stepper drivers TB6560 type (this is not the 4-axis controller or nothing like that, they do have the good fast optos) the steppers motors are the ones form Sparkfun Electronics 400/rev (0.9 degree per step).
Using a digital caliper I run trough a number of test doing segment hop 3.5,7,10.5 (basically 3.5 hops), also run same test but every movement starting from 0, 0-3.5, 0-7, 0-10.5, etc. also run the same measurements with 2.6. interestingly enough the average precision was best at 1/2 micro-stepping and got worse at 1, 1/8 and 1/16. This was at 0.08mm average. some numbers....
