Re: [Emc-users] bldc comp

2011-01-17 Thread Erik Christiansen
On Sun, Jan 16, 2011 at 09:35:53PM -0800, Kirk Wallace wrote: On Sun, 2011-01-16 at 21:20 -0800, Kirk Wallace wrote: I'm a little confused about the bldc comps. My study of bldc so far indicates that the top and bottom of three half-bridges need to to be controlled, so I though the comps

Re: [Emc-users] Kearney and Trecker Milwaukeematic IIIb progress

2011-01-17 Thread Don Stanley
On Sun, Jan 16, 2011 at 9:48 AM, sam sokolik sa...@empirescreen.com wrote: Now - yes the 7/8 drill is bent - it was the best enco had about 15 years ago :) Hi Sam; A little off topic. I used ENCO for years. I have found www.shars.com for better selection, price and quality. Shars also seem

Re: [Emc-users] bldc comp

2011-01-17 Thread Jon Elson
Kirk Wallace wrote: I'm a little confused about the bldc comps. My study of bldc so far indicates that the top and bottom of three half-bridges need to to be controlled, so I though the comps would need six outputs instead of the three (3 digital top, 3 PWM bottom). What am I missing?

Re: [Emc-users] bldc comp

2011-01-17 Thread Jon Elson
Erik Christiansen wrote: But with a little dead-time between one being turned off and the other on. So H-bridge drivers with hardware dead-time would be needed where only three signals are provided. (AIUI) You can't drive a 3-phase motor with only high and low drive in six step mode. It

Re: [Emc-users] Toolpaths from simple line drawings?

2011-01-17 Thread kqt4at5v
On Sat, 15 Jan 2011, Loren Card wrote: Hi All, I have a router table controlled by EMC . I've enjoyed writing g-code for toolpaths to cut out simple shapes. I've generated toolpaths using Radek's truetype-tracer. (The kids love seeing their name routed!) I'm looking for a way to generate a