dual drive x-axis?

[Ross77]

I agree that you should definatly get on and build it, probably learn more in the process. good luck.

May have retract my statement about cable stretch being low...
Had a look around today and seems that 1m of 3mm dia. stainless cable will stretch 0.5mm under a 200N load (20Kg ,not much if cuting Al and a heavy gantry)....:geek:

May be start a new tread If anyone is intested in following this topic up? Im not used to designing things that move! traditional to keep structures stationary. There must be a way to get cheap and accurate control of CNC machines........

[Ross77]

Somebody is going to have some fun calculating it all up! not me though :lol:


I'm a great believer in horses for courses....Milling machines for milling routers for routing......Now engravings a different thing.....It never ends does it :(

I hear you, I wouldnt ever use anything but ballscrews. But I like a challenge and am happy to do the math.

Would the SS cable stretch the same every time? What if it was already tensioned (stretched) ? What if the antistretchyness of the cable was more than the chiploadedness?

Yes the stretch is a product of the load (hookes law not mine) The bit that i dont understand is that if the cable is pre-tensioned and then a load is apllied, is this always an additional load (and therefore more elongation) as the cable is in an elastic state or is only a factor if it is greater than the preload stress?

if its the later then problem solved, if not can you use plastic design on moving parts?.........

[Ross77]

Somebody is going to have some fun calculating it all up! not me though :lol:


I'm a great believer in horses for courses....Milling machines for milling routers for routing......Now engravings a different thing.....It never ends does it :(

I hear you, I wouldnt ever use anything but ballscrews. But I like a challenge and am happy to do the math.

Would the SS cable stretch the same every time? What if it was already tensioned (stretched) ? What if the antistretchyness of the cable was more than the chiploadedness?

Yes the stretch is a product of the load (hookes law not mine) The bit that i dont understand is that if the cable is pre-tensioned and then a load is apllied, is this always an additional load (and therefore more elongation) as the cable is in an elastic state or is only a factor if it is greater than the preload stress?