9x20 lathe conversion, pointers wanted

[Stupoty]

Why not? ;D

Quite a few of the external motion controllers can manage that (apparently Mach4 and Darwin/PP can manage it, but Mach4 turn isn't commonly available yet), but for the vast majority of users, they won't be able to tell the difference between a thread cut with a single slot sensor and one cut with a quadrature encoder. I only used my old lathe as an example as it worked perfectly well.
My current lathe has a quadrature encoder connected to a KFlop/Kanalog, so it's capable of the Z-axis tracking the spindle perfectly and even reversing back, but it's got no major benefit during normal threading.

Hello,

I can see that threading at higher rpm should be fine with a single pulse per rev as the temperal error will be low and thus spacial error also low, how does this compair with tasks like machining a square section on a shaft?

Stuart

edit "i had a typo"

[m_c]

If you're needing to interpolate moves on different axis, then you'll need to use a proper quadrature encoder.

However, do you realise you won't be able to turn a sharp cornered square using this method?
I'd even question the ability to produce a reasonable quality square using this method, given the cutting angles that would be involved.

[Stupoty]

If you're needing to interpolate moves on different axis, then you'll need to use a proper quadrature encoder.

However, do you realise you won't be able to turn a sharp cornered square using this method?
I'd even question the ability to produce a reasonable quality square using this method, given the cutting angles that would be involved.

hello,

yeah i would imagine their would be some inacuracy in tool paths, i plan on going for many slots on the encoder just not sure how many i nead, i can always experiment wih this.

i'm not building it with anything perticular in mind it's just i cant have another lathe sitting around :) (i have my first lathe on a shelf in the bedroom it's a piece of art and i'm a bit attached to it)

at the moment I'm aiming highh and seing how far it can go :)

even if i end up with not as much capability as I would like it will be an interesting journey.

A mostly flat surface could be handy for easy finishing on a mill for example. Less nead to index part for hex heads for example.

thanks for the input I am taking it all in and i prommis i'm not going to try and run before i walk and all that.

Stuart