Re: Cam / EMC

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cncchip" <cncchip@y...>
wrote:

> I'm new to the group / CNC / retrofitting. It seams this group
> holds a huge knowledge base on the subject. I have a good back
> ground in electronics with a primary interest in microcontrollers /
> digital logic. I also have a small mill and 2 lathes. I would

like

> to automate one of my lathes. My main goal is to be able to cut

any

> pitch thread without the need for all the change gears. I have
> installed ballscrews on both of the lathes axes. My first question
> is: Will I be able to use the existing 3ph 5hp motor to power the
> headstock? I plan to mount a rotary encoder to monitor its
> rotation. I also intend to use EMC to control the motion.
>
> What is a good cheap CAM program that produces G-Code for EMC?
>
> Thanks
> Mike

The threading is a closed loop on spindle speed. As long as your
spindle speed remains pretty constant per rev, that's all you need to
worry about.

TurboCNC offers all you need for a really low price, including
schematics on the rpm sensor.

Since it is a one point sensor, a stall in one rev is a problem.

A little more sophisticated spindle location sensor could eliminate
that problem.

Dave