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I am possibly going to be converting a manual summit 20"x 120" x 4.125" bore lathe soon but have some important questions before I begin.

This lathe has a 7.5 hp 3 phase motor an I really need to...

you cant get precise positioning from hall sensors alone, thats what the encoder is for. By adding hall sensors you just simplify determining the commutation of the motor. The benefit to adding hall...

Okay,
here is a very simple test program I used to drive a brushless motor that was in an actuator for something I was working on. It had 3 hall sensors built in.
To determine the order in which...

I'll have to do some digging to find it. give me a few days. bear in mind the relevant code would only be the commutation table. I doubt it will help much, except to clarify just how simple it can be...

sinusoidal commutation is good for continuous rotation applications like model airplane motors and the like. Not advantageous for servo use, especially at very low speeds, where maximum control of...

$15 +$20 ? Thats not too much less than an AVR ISP mkII, the isp programmer from Atmel.

I just recently bought some little STM32 boards, for around 5 bucks each on Ebay. There is a group porting Arduino to STM32.

Arduino for STM32 - Index page

I'm just getting started with it, but...

Still havent gotten a chance to send those particular comment lines. All my computer archives are unavailable to me right now while I upgrade my network storage system.
soon..

If I get a chance later this week I'll try to send a little list.
Thanks
Marvin

I stayed away from Arduino for a long time, I was under the impression that it was running on an interpreter. But its compiled and like H500 said, its just some of the libraries that are slow. Whats...

Yes, I'm a big fan of optocouplers, and have been looking into adding schmidts to some of my own designs.
If you move away from ME compilers you will probably reach quite a few more AVR developers,...

Using the encoder for commutation is a really interesting solution. I like it a lot.
It occurs to me that since you are using a mikroelectronika compiler it would be a fairly easy process to port...

I think diy servo controllers in general, would be further developed by now if everybody would separately design the logic side and the power stage as two separate boards.

So looking at your schematic it looks like you could run Brushed DC, BLDC, or steppers depending on the firmware. Possibly even closed loop steppers since it has encoder inputs. interesting.

267644 I'm using one of these with a microcontroller and small "rattle" type automotive fuel pump. the microcontroller meters oil one tube at a time and each for a user specified pulse-width....

I have been looking at those same ARM boards, and plan to make an order for a couple in the next few days.

So this is looking really good. I took a glance at the code again today and an idea struck me. I think I'd be interested in taking this and replacing the brushless motor control stuff with regular DC...

I believe you made the right call to ditch the sine table. Really just a truth table is probably the best. for whatever position the shaft currently is in you should always have the capability to...

Part 1;

A few years ago I built a BLDC driver with an AVR. My motor had hall sensors so I used a square wave 6 position truth table to determine the commutation. I used this system as opposed to...

I went back and had a look at my previous attempt to translate the program comments from Russian to English. Yes it was a total mess, and the code was totally screwed up. So I spent a few hours...

bummer, I was about to ask the same Q.

This thread became a little confusing for me as far as which versions were working and what was not. Would you mind sharing your code and schematic? I have been very seriously considering building...

are you using V belts? If so that may account for a couple % inconsistency.

eventually I'd like to fully automate my back gear lever, I'd be curious also what you have done with yours.
Marvin

Mach 4 has been coming soon for several years.

I've shown several people video's showing that coolant head and told them I intend to build one similar to that. That thing's awesome.

Jim,

I'm building a Hydrapoint right now. I'm using servos, but not a commercial off the shelf solution. I'm using 24v 2hp Battlebot type motors on 2.5:1 htd belt drives for the X and Y. I'm...

for quick turnaround doing boards yourself is my favored method. Using my modified Epson inkjet PCB resist printer I have been able to make a revision in proteus, print the resist on the board, bake,...

Well since this has now been resurrected by someone voting I'll add my $.02 .
I run dual 17" monitors running 1280x1024 each. the on-board video card of my Gigabyte F2A55M-DS2 motherboard allows me...

So whats the final word on this, does the code work or not? I am wanting to use something like this on a pcb router. I already have some extra electrocraft servo's and all the hardware to start...