New build.Stell frame cnc 1500X1000.Ball screw and gearing calculations

[ba99297]

I have made some calculations with motor speed at 3000 rpm ( max according Yaskawa ). Tell me if i am wrong

motor speed 3000


case 1-with 2010 ballscrew and 2:1 gear ratio

motor gear ratio 1
ballscrew gear ratio 2
ballscrew length 1400
ballscrew diameter 20
ballscrew pitch 10
ballscrew rpm 1500
ballscrew rpm threshold 1234
rapids mm 15000


case 2-with 2015 ballscrew and 3:1 gear ratio

motor gear ratio 1
ballscrew gear ratio 3
ballscrew length 1400
ballscrew diameter 20
ballscrew pitch 15
ballscrew rpm 1000
ballscrew rpm threshold 1234
rapids mm 15000

Both solutions i think they have the same torque and the same rapids. The differense is that case 2 reduce the ballscrew bellow 1234 threshold.


If i use one motor and two ballscrews i have to tension the timing belt
The follwing us a 2d plan i made in order to tension the belt


The magenta cyrcles are the ballscrew pulleys
The yellow cyrcle is the motor pulley
The green cyrcles are pulleys with no tooth
The motor and the green pulley above the motor will be movable in order to tesnion the belt.
The red colore represent the timing belt

And finally my questions

1. Do you think the above plan is a good solution for my case?
2. can you tell me what pulley width should i buy?
3. Do you now any suppluyer with good prices an quality for such pulleys and belts?
4. Does the timing belts have rpm threshold?
5. If i tension the belt that way ( above plan ) would that reduse its life
6. Cast iron or aluminium is better material for pulleys
7. which case ( case 1 or case 2 that i discribe at the begining ) is better?


Thank you for your time

Vagelis