I had some old plans I found on the net, that was belt driven, but would take up valueable room, and extra expense also vs. a direct mount.stevehuckss396 said:Sounds like you answered your own question.
BTW, I have never seen a RT that was belt driven.
So there is no power there unless its turning? That sucks! This totally blows my plans. Why would that be? Why would Mach 3 put gear cutting wizards on there software if your doing it manually anyway! Useless!kvom said:I have read that the main problem with "normal" rotabs under CNC as an A axis is that there is no automatic lock. Therefore the table can rotate under the force of the tooling by the amount of backlash in the system.
Unless you are turning the table while cutting you don't need a lot of torque. Most of the mill while turning applications seem to be engraving on a cylinder.
Wow....that will be awesome.RonGinger said:I just finished a rotary table using what looks exactly like the table you are using- I got it from Little Machine Shop. I mounted teh stepper as you are doing, except I used a piece of round stock instead of square.
I have cut a couple gears with it- 48dp, 20T and 40T for a Little Angel engine. Worked great. Backlash is not a problem since the gear program keeps moving the table in the same direction.
I used the Mach3 NFS wizards to generate the code (since I do the support for those wizards why would I use anything else
I am now working on a cam shaft cutting wizard. Ive got the math done, using the harmonic cam code from an old SIC magazine. If I get it working in time I will be running it on the demo KX1 at the Cabin fever show next weekend.
RT's are typically driven by a worm gear. One of the things about worm gears is the worm can't be driven by the gear, so the only backlash you have to deal with is the lash between the worm and the wheel (which will not be zero or it wouldn't turn)1hand said:Oh....I understand the backlash issue. I thought when you said no lock you meant, the stepper was dead at idle. That you could turn it with your fingers.
I can deal with backlash, but didn't know how to overcome keeping the stepper from not turning when its suppose to be stopped.
You Know what I mean?
No locking. It's a standard worm-drive RT, so the stepper doesn't have to do much to hold it, but it is powered1hand said:shred,
are you locking down the rt after each move? or is the stepper holding it in each postion for the milling?