linear shifts

[punto]

I would like to try in the cotrution of a 3-axis cnc cutter for model use. in the various forums that are in the immense network I do not find, and here I am asking our portal, what kind of system to use to move the axes:
- a linear trapezoidal screw system
- a linear ball recirculation system
- a linear system with knees
- more

the goal is speed and quietness and it is for model use only wants to be a comparison/choice to optimize the project!

 

[PierArg]

Hello, try to see on youtube that there are several movieshttp://www.youtube.com/watch?v=ktlbvmnspvu&feature=fvwrelMaybe you could see if you find some links to some forums

of course there are also those more "seri" to 5 axes

 

[cacciatorino]

I would like to try in the cotrution of a 3-axis cnc cutter for model use. in the various forums that are in the immense network I do not find, and here I am asking our portal, what kind of system to use to move the axes:
- a linear trapezoidal screw system
- a linear ball recirculation system
- a linear system with knees
- more

the goal is speed and quietness and it is for model use only wants to be a comparison/choice to optimize the project!

I'd say to discard the straps immediately. their elasticity under the cutting forces would cause the impossibility to really control the position of the pedestal against what is commanded.

The trapeze screws are silent but you can't preload them, unless you mount the strange bowls for which you have to expect a little bit of play in motion reversals.

I would go with ball screws, you can find them cheap and already worked according to your needs at misumi. The only thing is that a machine tool by definition produces spherical, so you'll have to be careful to protect them as you have to.

 

[punto]

What if instead of the straps you put chains?
Would you think there would be a savings on the screw-chicciola-cuscinetti?

 

[punto]

After some research I would like to move the three axes to use racks and gears, what do you think? should cost less for what will have to work, wood and aluminum, on hobbistic level.

who helps me to dimensional the engines step by step that I don't know how to do it?

 

[meccanicamg]

After some research I would like to move the three axes to use racks and gears, what do you think? should cost less for what will have to work, wood and aluminum, on hobbistic level.

who helps me to dimensional the engines step by step that I don't know how to do it?

to do it with pinion and racket you absolutely have to think about the recovery games since the handling is not accurate.

solutions for recovery games are:
- two engines and two pinions. a motor controlled in couple and the other in speed
- double pinion with preload. two lazy superimposed angularly to recover the game, as it was a preload
- terna of pinions with two going on the rack to transmit the bike

However it is a mechanically insensitive solution for a cnc milling machine also from hobbistics. the milling tool that is mounted on the milling machine.