Quite an Unusual one

[Boyan Silyavski]

Guys, i have to start sooner this build as everyday i change my mind.

Now here is the deal. i have decided to make the machine with working area 1200 x 2500 and at the same time make it fast and rigid. Till now the problem was limited space and problems in moving the machine.
Now the funny part. I bought yesterday a towbar and am looking to buy a suitable platform trailer, so i will mount directly the machine on the trailer
I did not want to cut myself short just because i could note move it from home to home. So its decided.

I will definitely go with the Johnathan design of a gantry just make it suit my needs and abilities. maybe even add one more beam at one side like a standart gantry, as Dean suggested somewhere.

So here is where i need help:
When the machine was small it was clear that 1605 screw for the z and 1610 for X and Z.

Now some options for the gantry:
1. make it from 2 100x100x4 = whole gantry below 50kg

2. make it from 3 100x100x3 / 2soldered together/ - 1m=9kg, so whole gantry will be ~ 65 kg

3. make it from 3 100x100x7 = whole gantry 80-90kg

-So, the big question is how to move the gantry at 2600mm length?
-What screws, what motors?
-Servo maybe ? I know nothing about servo, can you point me to good money wise servo for the long axis?
-What drive relation 1:1 , 1:2, 1:3
-unfortunately i can not machine rotating ballnut. Could somebody help me here? any other options?


So now i am a bit confused between 2 options, make a sturdy beast 1250x1250 or make a sturdy beast 1250x2500 with your help. I mean an exemplary sturdy beast for the generations to come