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Are you sure increasing the Z speed would increase your overall performance that much?
If you look at the programmed feed rate vs the actual feed rate when Z is moving, is it really close to 1/10 of...

If you connect one of the inlets to an accumulator tank that has a significantly larger volume then the cylinder, you can just pressurize the tank to your desired force and leave it alone.
It's not...

Lining the inside of your furnace with stainless steel might not be a good idea unless you're going for an argon flooded electrically heated unit, as the stainless steel oxidises very rapidly at...

There are two things that immediately strikes me:
1: The tank cap might be a bit overkill. Remember the current flowing through the workpiece is the current flowing through the induction coil...

Have there been any development in this field lateley??
I am in the process of gathering information on a furnace that could be used for melting Al and possibly for making some Al/Mg alloys....

The totem pole drive seems to be the proper thing to do...
I made this circuit to go from 5v to 12v just to try how it worked.
http://dukerx.no-ip.com/totempole.gif
I managed to cut the switching...

Only half-true, as increased PWM frequency leads to a higher rate of rise/fall instances, thus adding up the power dissipated while the transistor is not fully on.


For those measurements, I used...

I've been trying to wrap my head around this issue of quick switching times not being obtained...
It has been pointed out that I need super-low gate resistance fets.
fair enough, but I don't think...

Now you put your hand in a wasp nest buddy :)

Why would anyone go to the hassle of overpowering the motors by as much as 10 to 20 times rated voltage if it had no benefits???

I replaced the transistor I'm conducting my current/PWM tests whit a 2SK1936 part, wich has slightly lower switching times, and as far as I can tell, the gate/source capacitance is lower too, as the...

Yeap...
I DO have a problem whit non-square gate voltage on my fets.
I know this causes problems.
As this is just an experimental unit, I resorted to using whatever I had on hand.
The whole idea...

The FET's I'm using are far from ideal, but that's not the point...

I'm currently working on a project that uses one AVR Mega48 microcontroller to drive four MOSFET's using hardware PWM and hopefully no current sensing resistors.
This is for unipolar motors.
...

Well...
My LPT port is working like a charm. The problem was me. Not the hardware.
No.. It wasn't disabled in BIOS or anything like that.
In my enthusiasm and typical hurry, I ignored the warning...

I've been playing around whit the MACH3 software a bit, but when I went about hooking up a cable to my LPT1 port, I doesn't seem to get any sinals, either input nor output.
I haven't connected any...

I really loved the "Half step Full torque" paper, and think I'll try to use it whit some of my own stuff.
I'm using AVR µC to control some Sanyo STK6713 hybrid stepper drivers.
The reason I'm using...

Is it possible to connect a 6-wire stepper motor to a 4-wire controller?
The reason I ask, is that I have a bunch of 6-wire steppers, but it seems that the 4-wire controllers are much more...

Please elaborate on this torque-measuring methode?

I just drill a hole in the axle and insert a pin/screw, to wich I tie a string of some sort at a fixed distance from the center of rotation (1...

I have scavenged alot of steppers the last few years, but I can't find any data on them.
I took a picture of those I beleive are the most common ones.
Can any of you tell me something about these...

Correct me if I'm wrong here, but aren't unipolar (6 wire) steppers simply bipolar (4 wire) steppers whit a center "tap" on each coil?

I have scavenged quite a few unipolar stepper motors from copying machines over the years. Some of them are quite big (and heavy).
I also desoldered the stepper drivers asociated whit the motors....

This is actually my 3rd post, but still, I consider myself a lurker.
I don't have much experience in machining and mechanics.
Been working as a xerox machine repairman, and have learned some...

I've been toying around whit some of the free CNC control programs that can be found on the net, and most of them relie on a parallel port to run the servo/stepoper drivers.
I don't like hooking up...

You won't get any more guesses if the sound is unavailable... So go rehost or tell what it is...