Build log at last

[Boyan Silyavski]

I certainly like the double ball screw idea and placement, what i dont like is the possibility of adjustment and the fact that both end supports are enclosed by the frame. Make sure the ball screw assembly is shorter by 1-3mm than the distance needed and use a plate inbetween, so you could sand the plate and adjust accordingly, or use epoxy putty there, adjust and let it dry.

Just make sure you mount the rails perfectly, that will guide the ball screws and will greatly facilitate the final adjustments

[Gregor]

I know you shouldn't buy anything until I have the design finished but i have been offered 3 X AM882 drives for £110 would this be a good buy and work well for this machine, With my knowledge off electrics not great i want to keep the electrics as simple as possible .After reading some more build logs am i right in thinking that 1610 ballscrews all round would be ok for this machine with Nema 23 Stepper Motor 3Nm all round or Nema 23 Stepper Motor 4Nm?
Cheers Greg

[Clive S]

I know you shouldn't buy anything until I have the design finished but i have been offered 3 X AM882 drives for £110 would this be a good buy and work well for this machine, With my knowledge off electrics not great i want to keep the electrics as simple as possible .After reading some more build logs am i right in thinking that 1610 ballscrews all round would be ok for this machine with Nema 23 Stepper Motor 3Nm all round or Nema 23 Stepper Motor 4Nm?
Cheers Greg

Greg If the am882 drives are in good condition then they will be fine . 1610 on X and Y. 1605 on Z nema 23 are good as long as you get them with low inductance the 8 wire version. Zapp or cnc4you have the correct one's

[Gregor]

Thanks for all the advice
I have made a start on the design off the z axis which i am not sure if i have worked out the travel right so any advice would be great,I change the profile for the Y axis L shape to 90x45 I think it was in a post by Jazcnc that I was reading that it is handy for fitting the Hiwin rails to. Here are some pics with the measurements
Cheers Greg

[Clive S]

Why have you gone for the square shape on the gantry sides as your previous post you shows it different. It might be better to show the z axis in more detail as you will need a cutout on the back plate and the front plate to accommodate the ball nut.

[Gregor]

Sorry I posted the wrong pics here are the ones I should have posted.If my calculations are correct the spindle should be 25mm from the edge off the front off the gantry
Cheers

[Clive S]

If you have not bought your screws yet the Y screw could be made shorter and the pulley and the motor could be inside the gantry as you won't be using the full length of the screw.
Are to still at the drawing stage or have you started with the build?