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mariusl wrote:

I just discovered that my formula and the one in the QTPlasmaC documentation ids not correct for the THAD2. Those formulas work for the previous release of THAD.
PncConf has the correct formula by the looks of it. Does any have the correct formula for me?

Have you looked at the THCAD2 manual? the formula is in it,

This example in the docs is similar to what you want
linuxcnc.org/docs/stable/html/hal/comp.html#_out8

Ah, I see. I'm not sure I want to dive into something cutting edge. Caxis.comp just sounds intimidating because I haven't read up enough about it yet.

The INI and HAL I attached is a traditional XYZA setup. A is controlled with degree command sequence like below for turning decorative spindles for example.

G00 Z3.3000 
G00 A0.0000 Y0.0000 S20000
M3 S20000 (regular 10HP spindle)
G4 P1.5
G01 A359.9011 Y0.0001 Z2.1250 F200.0

For applications when I need the ACTUAL spindle and rotary to spin non-stop (like a spindle) (as in my YouTube video), I envision loading a XYZ+A_Spindle type config where I can issue this instead.

G00 Z3.3000 
G00 A0.0000 Y0.0000 S20000
M3 S20000 (regular 10HP spindle)
M3 S100 $1 (additional rotary axis now turning like spindle)
G4 P1.5
G01 Y0.0001 Z2.1250 F200.0

On this page.

Your work is excellent and simplifies the understanding of not understanding Linux. Thank you very much!

My idea for ohmic probing.
See attached pictures
Kind regards

okay maybe i am missing something.

I turned the switch to C, cranked up the voltage (my desktop power supply goes only up to 31 for some reason) and there is no change in the amount it spins for 'one' revolution. Still about 1.125 and pulling .25a.

The control method dip switch (6) is set to open control mode.

one thing that dawned on me, and maybe this speaks to me not quite understanding what is meant by pulse/rev, is that if the driver is set to default, all switches 1-4 set to on, there is not difference between the behavior when its set to 1600.. Even though the steps the arudino is sending are the same. this confused me even more.

I don't want to start disconnecting hardware for this. It's really just to see, while I'm sitting in my living room, whether the g-code is "mill ready".

In the end, I just took a copy of /usr/share/doc/linuxcnc/examples/sample-configs/sim/axis/axis.ini , and I'm using that. I have a pretty basic mill. I had to adjust the limits in the .ini file, and I realized that since I'm simularing I could bump the velocities way up, and it's been useful, so far.

What kinds of things are you worrying about, that will "wreak havoc"?

that's a very good idea！Cheers!

very good idea!

Rockwood wrote:

Thanks, I was hoping that would be the case. Do you have any brands/models you would recommend?

 

Quite a few ethercat servo drives have onboard IO available.  Some of the IO are identified in the manuals as limit switches or similar, but there's no reasion you couldn't use the IO for some other purpose.  It'd just get mapped to LCNC as general purpose IO and could be read or set via M-codes.

And some drive have pluggable terminal blocks instead of the fiddly D-sub connectors for the IO pins.  No need to chop up a cable to connect to the field IO.

I don't have a brand recommendation, but it wouldn't hurt to download a few user manuals or spec sheets and see if there are IO speeds provided.

Just an example... the Leadshine EL7 series could be had for around $400-500 and has easily wirable IO.  You could pick one up and cook up a test rig with some sensors and relays and see if it'll work fast enough for your needs.

EDIT
This is, in fact, what I think Tormach is doing on the 1500MX.  From a video I watched, it looks like they are using Inovance SV660N drives, and have bought/fabb'ed a breakout board for the drives' extra IO. Instead of sourcing an ethercat IO module (like PCW mentioned) for user-installed IO, they're using thier existing USB IO module.

Each SV660N has digital 5 inputs and 3 outputs, so looks like they've got 25/15 available.

Pic of the 1500MX panel below.  Note that all the drives have a D-sub ribbon cable to the center IO breakout board.

 

My top spindle speed is 5400 RPM and that plate is .032" aluminum. If it does cause vibrations, they are too small for me to notice.

Only set the turn switch to C, D, E, or F

You really need max current here.

Crank up the supply voltage and make sure there is no current limit.

Try changing the position of switch #6.

See what happens.

JohnnyCNC wrote:

If you can squeeze a disc with a notch in it somewhere you can use a slotted optical sensor.  This is my setup and rigid tapping works great.

 

 

Won't the unbalanced weight cause vibrations?

That worked perfectly, thanks!