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Try prepending sudo:
sudo comp install BQ.comp

Lower inductance motors will give better high speed performance - less torque will drop off at high speeds because the driver will be able to pull enough power quickly enough before it's time to...

I think I've got it working now. Looking through the EMC mail list archive I found that the interpolated encoder output needs to be used, at least with something as low resolution as 66 cycles/rev. ...

Hi Zig,
Fascinating book there, I'll have to read through it. Ouch, I guess the $186 price tag reflects that it's for a limited audience. Lets see how much Google books lets me read.

The...

That's exactly what it sounds like!
I don't have a traj_period_nsec setting - I'm running latest 2.3.4~pre built from source code I fetched a few days ago. I searched through the code and it looks...

Hi Zig,
I previously implemented a HAL module with just the goal of having a stepper driven leadscrew for manual lathe work, to get around not having a set of change gears and threading dial: ...

To expand from my original post: There is just a single channel spindle sensor with no index, feeding a "phase A" signal into the encoder which is in counter mode. So I hacked the encoder module to...

Hello,
I've setup EMC with a manual lathe that I've fitted with a stepper motor and simple gear tooth sensor as an encoder. I'm getting awful spindle synchronization, I think it is bad...

Hello,
I know exactly what you're talking about - paper cutters. I worked at a shop when they bought a new expensive, really nice cutter.

It had an air table - little check-valve balls on...

Can you wire the step/direction signals together for the dual-motor axis?

From CNC4PC:
"This card lets you control your spindle with step and direction signals, as if it was an axis motor."

So pwm is not the right thing to use, you might want to use freqgen instead.
...

Hello,
I've got a 1969 Series I J-head machine that's got ballscrews and used to be CNC. The old servos were not part of the deal (nor the refrigerator sized NC controller!) So right now it's...

Yes, that is what the manual says.

Or you could unwind it an extra 1.5 revolutions, and give it a 3 full turns from there. ;^)

-Matt

I see, it's the interpolation that's the special thing, that makes perfect sense now. It doesn't tell you where it's last position is, it tells you where it thinks it is, which is fundamentally...

I've used EMC just for it's HAL system and UI - I wrote a lathe feed/threading program as a HAL module to simply replace the need for change-gears (ie, not exactly "CNC" since no G-code.) So, I've...

If going with a flash based system doesn't work and you need to use a real HD to a) actually work and b) get good performance, then maybe you could build some kind of shock mount for the hard drive. ...

Bruce,
I'm extremely interested in how this thing works inside the MPP firmware, is this layer as open as the ones above it, or is it locked up as top secret IP? Are there at least any block...

Bruce,
I'm extremely interested in how this thing works inside the MPP firmware, is this layer as open as the ones above it, or is it locked up as top secret IP? Are there at least any block...

What could possibly be the reason to not have one?

Yeah probably, but... If the latency is 14000, does it matter that it's a laptop? That's a direct measurement of just how real-time it is.

Assuming you're using a parallel port, does your laptop...

This caught my eye so I looked at the charge_pump component: http://cvs.linuxcnc.org/cvs/emc2/src/hal/components/charge_pump.comp

It appears that it outputs a square wave (at half the frequency of...

Super cool! I immediately figured out once I saw the wheel and string that it is a spring powered, multi-geared machine.

How do you get EMC to do this? Excuse my ignorance, but are there...

Can you spray a coat of varnish or lacquer to seal up the exposed conductive traces and leads?

I'm guessing it probably wouldn't work, otherwise, you probably would have heard of it by now.

EMC wakes up and is able to read/write to the pins and make various calcuations every [so many] times a second. This is set as the "Base period". I have a 900mhz P3 and I find I can go as low as 40...

Interesting, but some of it is out of order such as inserting the pattern is in the third video instead of the start of the second.
Also, I didn't see the exciting part, the pour!

Looks like a...

Interesting...
It's weird to have code and data in your .h files.

Something you might want to do is to read some timer/counter and keep track of how much time expires instead of getting the CPU...

I'm not sure of the proper terminology, but think of looking at a tap drill chart where they list the percentage thread depth fit. For example, one chart I found from googling "tap drill" lists 75%...

You're right, the A axis direction must be an output if the pulse is an output.

The A-axis is listed as having an input on pin 10. According to EMC's HAL documentation, this isn't going to work:

"The HAL driver supports the bidirectional port, and allows the user to
set the...

Thanks for the details, Mariss. I've been passively reading all I can on steppers for the last few years and havn't come across those datapoints yet.