>
> For the 4th axis, I have a Troyke CNC rotary table that I
> bought on
> eBay for $149:
>
> http://igor.chudov.com/projects/Bridgeport-Series-II-Interact-2-CNC-Mill/24-Troyke-Rotary-Table-U12PNC/
>
Wow, that looks like a really great deal! I was worried about backlash in a
rotary table with an acme screw. Or does that tale come with a ball nut and a
ground screw?
> The only minor complication with this table is that it uses
> a resolver
> instead of an encoder.
>
I assume you mean the motor has a resolver? Either way, you can use a
microcontroller with a decent A/D (10 bit or better) and turn that resolver
into an encoder.
> I heard that most people who want a 4th axis, buy a manual
> rotary
> table and add a position controlled motor to it.
That was my orig idea myself. Right up until I started playing with my
manual rotary table and noted the backlash. I was also thinking that the high
gear ratios will limit overall speed to extremely slow speeds.
> So, the bottom line, please share what you find.
I will thanks!
Andrew
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