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@szopler
I don't have any MEga88s to test this with but I think the fuses should be:
Extended 0xFE
High 0xF5
Low 0xFF
Good to hear you have it running. I'd advise some bulk capacitance close to...

The openPNP google group is going strong, with ongoing software development and real working machines...

Here it is: archive

Nice, the rails made it to Hackaday: Cheap and easy linear supported rail - Hack a Day

Though the comments aren't very nice :<

Michael

Wow, the 25mm round rail supported with 3/8" thread rod works really well and is cheap too...

http://n0m1.com/wp-content/uploads/2012/04/cheap-supported-linear-rail-bearing.jpg

I used the Z...

The next progress installment has been blogged, heat forming some threads into bits of UHMWPE for a Z-axis leadscrew nut...

http://n0m1.com/wp-content/uploads/2012/03/half-nuts.jpg

There is...

We have made some progress on the design as well as accumulating some parts.
The Z is entirely 3/4 inch aluminum and the rest of the gantry is square steel tube and 3/4 inch mdf. I've attached a...

So what's a good price on a 4x8 x3/4" (19mm) Delrin sheet?
I googled around locally but will have to call tomorrow during business hours..

Michael
http://www.n0m1.com
Krazatchu Design Systems

@HorridHenry

The build will be around 4x6 feet so MDF is the real price winner here.
Expansion from humidity will be accounted for by a few coats of paint...

Michael
http://www.n0m1.com...

Just starting milling some MDF parts today for a Gantry Router.
We have most of the Z designed and have started testing MDF for milling, fit, rigidity and all that jazz...

The machine will be...

Here it is, complied for the Tiny2313 in mode 3...
http://n0m1.com/wp-content/uploads/2012/02/SMC3AMode3.rar

Michael
http://n0m1.com

Punisher454,

Sounds good to me.
Google must have improved recently, I had a go at translating it a while ago and it didn't get more than 25% of the words.
I think a lot of the...

.

Yes, here I am, just a little slow to reply...
I've been preparing a project for kickstarter and as a result haven't spent much time working on the Servo Software.

When I get around to finishing...

The ATmega gets the job done, it's common, not expensive, available in DIP form and lends itself to Arduino compatibility...
I'm making an open source DIY kit (recent update), so the AtMega328 is...

@Helmut

I think an ARM M3 would be a better choice.
With quadrature hardware, deadtime on the pwm, built in USB...
They are cheaper and faster than the Xmega...

Michael
http://n0m1.com/...

I've been working on an Open Source DC servo system that will be released under GPL.

I'd like to share my progress as well as receive feedback, criticisms and recommendations.

The project, and...

I have converted Chan's encoder polling function to inline assembly for use within C.
It's considerably more portable this way and is released under GPL.
It's been testing @ 100kHz along side a...

@moghul

Scroll down, the rest is on pages 2 & 3...

Michael
http://n0m1.com/
Krazatchu Design Systems

mo7, Show your schematic and board if you want help...
And whats the model of your encoder?

Also, I believe the velocity mode also uses the encoder, only voltage mode works without the encoder......

Hey...

My friend Matthias of Woodworking for engineers and I had a competition with his homemade bandsaw vs my cnc mill...

The write up is here: Bandsaw vs CNC

And the video is here:...

@ gman2707

If you look at the the source file, "Servo_Mg48_20Mhz_v3_5.asm" using a text editor (or programmers notepad)...
Starting after line 556 you will find the input commands for serial...
...

@ Atmel: Wow, your selling boards I designed so long ago...
The original boards are on my website: DC Servo Drive | Krazatchu Design Systems

I'm working on a new DC servo layout with new...

The ir2184 cannot do 100% duty due to the on board charge pump...

If it weren't for shipping & import taxes, it would be a great deal for me...
I'm in Canada, I'd better update my profile to reflect...

For comparison, the 940mm set is about half the price of...

Hey ppl...

I've been sourcing parts for a gantry router build on the cheap...
Pretty much have everything figured out except the linear hit a snag today...

I was leaning towards a supported...

The 0.15 ohm will give you a current limit of 3.3 amps...
The 0.2 ohm will give you a current limit of 2.5 amps...

As r= 0.5/I ... Then I= 0.5/r ...

I'd go with the 2.5 amp limit for...

You don't want an inductive resistor like the wire wound...
You might find some non-inductive types in a to-220 case with two legs instead of three...

Otherwise the sense resistor is just a...

I think the 16MHz xtal is the correct one.... With a 20Mhz it's going to be way off...

Hey ppl...

I just ordered the "MICRO Router MOF, #38 568" to use as a high speed spindle on my SX3...
It's on the Proxxon website under "New items"...

I was considering the IB/E but then I...