Simple Machine (help and advice needed)

[Blackrat]

just another +1 on the hiwin rails ...

for the price difference it IS money well worth it !

for the gantry , dont have the gantry side like an upside down T as it offsets the spindle too much and the spindle will go quite a bit over the tables surface. using a L shape might be better and reduce the amount you go off the table (unless you want to ofcourse)

[EddyCurrent]

for the gantry , dont have the gantry side like an upside down T as it offsets the spindle too much and the spindle will go quite a bit over the tables surface. using a L shape might be better and reduce the amount you go off the table (unless you want to ofcourse)

Yes, the spindle should be inside the footprint of the 4 gantry bearings, this is the key diagram; http://www.cncroutersource.com/do-it...NC-router.html

[Gregor]

Thanks for the advice would this be a better design.

[mekanik]

Hi Gregor
That setup would ensure you get the Z axis very close to the gantry and the motor should be positioned as near to the centre of the X bearings as possible.
Only problem i envisage is the alignment of the gantry rails, do have a solution to this ?
Regards
Mike

[EddyCurrent]

Yes, that's a better design.

Only problem i envisage is the alignment of the gantry rails, do have a solution to this ?
Regards
Mike

You are right, maybe one rail could be welded and the other bolted to allow adjustment ?

[Gregor]

Hi
When you talk about the gantry rails are they the rails on the x axis,Heres a few new pics ,I have done all the metal work to scale on sketchup and the dimension's off the base are 860mmx720mm not including the end plates on the base. The gantry was made 730mm to allow for clearance for the plates for the ballscrews. As I say I want to try and make it as simple and easy to make with most off it made by welding so let me know if this design is a load off Cr@P
Cheers

[EddyCurrent]

Hi
When you talk about the gantry rails are they the rails on the x axis,

Well I assumed mekanik was talking about the Y rails, those actually on the top and bottom of the gantry cross beams.
Are you putting the Y ball screw between the two cross beams ? if you are it's been suggested to add a plate to the front to keep crap away from the screw. This means putting a slot in the plate to allow the bracket where the ball nut attaches to the Z axis to move across. like here; http://www.mycncuk.com/threads/6418-...8048#post48048
It also adds strength to the two cross beams.