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Messages - chad

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Just let me know when you are ready to put it in and we will figure it out


HI Graham, either of those will work fine. The digi speed xl seems a little more feature laden but the cnc4pc one would work too. The 24 volt that you were looking at is kind of mis leading. It is simply the common on the relay the ccw is the nc side of the relay and the cw is the nc. He called it 24 volt because that is what most vfd's use for their switching input voltage.

Looking at your pictures and your schematic it will be no big deal to get mach controlling your spindle with either. I would be happy to help. I also see in your pic of the 0- to 10 board the little white ic is a optocoupler, that means that it is indeed isolated from the 240 vac coming in to the other pins of that board. If you don't care about reversing the spindle then it is just a couple of wires to hook up if you do we just will need to dig a little deeper and figure out what voltage that reversing relay needs to trip it. We might need to add another relay in the mix just to keep mains (possibly) of of the speed control board. either way no big deal, you lucked out on the speed controller for your lathe they couldn't have made it any easier to interface with mach.


Works in progress / Re: An unfinished screen set - "Mach Blue"
« on: November 03, 2006, 04:30:34 AM »
This is a confirmed bug.   Art knows about this one (i have the same problem. At This point i don't know if it is a Brian or Art problem. My unfortunate workaround is to unload mach blue  :(


Tangent Corner / Re: "Click and Buy" Bunch of scabs
« on: November 03, 2006, 04:22:37 AM »
Not that it will do a whole lot of good but you might want to file a report on the troubles you are having here.


at least they can start a file..

i had the same kind of problem with web-fax


General Mach Discussion / Re: Everything has gone haywire
« on: October 27, 2006, 04:09:15 PM »
It sounds to me that it is time for one of those methodical pain in the @$$ top down debug sessions. Start with the power go wire by wire don't assume anything, meter every wire out and know exactly where they start and stop. Check fuses (measure continuity not just look at it). then check the motor / encoder wiring slowly and carefully. then move on to the computer/ breakout board. Take it one pin at a time. If you have a scope this really helps, if you don't a led and a 330 ohm resistor can help trace problems on the 5 volt ttl side. Make mach out put something and make sure that you are getting what you should be. Double check your encoder A /A , B /B it6 is easy for things to pop up here. You will figure it out, it will probably be something stupid and you will want to hit your self in the head with a brick. I know i have. I find it helps to draw the entire system out as a schematic and then compare the sch with the actual...

Good luck.

General Mach Discussion / Re: Program E-Stop in middle of jobs
« on: October 27, 2006, 03:50:44 PM »
Backlash is a problem, period. I personally think art should just remove it. It is very rare that a system can use it. It isn't art's fault. when you really sit down and think about what backlash correction is doing the problems become obvious. 95% of stepper systems are going to choke on backlash compensation. I have tried it on two servo systems and also have problems with it.

When I first started with my first cnc retro it took me forever to figure out why my motors were locking up. Then I traced it down to backlash and I like others felt that mach had a bug. After working out what was happening I realized the inherent limitations of backlash compensation.

OK so where does this leave us? The best thing to do about backlash is get rid of it in the machine. No amount of software is going to fix it. When you are cutting the bit will pull the work into it because of the mechanical backlash and this is something that the computer cannot fix.

Backlash will absolutely not work in constant velocity, it HAS to be run in exact stop mode.

Wawatobi, I think the problem you are having is related to you feed back from the steppers and using back lash. From what i can gather if your stepper feed back realizes that you aren't where you should be it triggers an estop. When using backlash with steppers it is usually described as steppers stalling ( a common occurrence with back lash ) with your stepper position monitoring system it is bound to trigger an error and halt your code. 

It is no ones fault, it just is what it is.


General Mach Discussion / Re: Softlimits
« on: October 26, 2006, 10:30:02 PM »
No problem.

If you can spare one extra input pin you can wire the other side limit switches serial and if any of those three are hit it will trigger an e- stop. Just do the same trick assign all the other limits to the same pin.


General Mach Discussion / Re: Softlimits
« on: October 26, 2006, 08:29:02 PM »
Ok in that case that switch will only do something when you are in homing, mach knows when you are homing and ignores the switch the rest of the time.

You can also use that switch as a limit. Just set the same pin number for the home as the limit. If you are moving and then hit the switch it will cause a e stop.

General Mach Discussion / Re: Softlimits
« on: October 26, 2006, 07:06:23 PM »
Are you using 1 switch for BOTH homing and limit?

Or do you have 2 switches, one for home and another for limit?


Show"N"Tell ( Your Machines) / Re: Chads new machine
« on: October 26, 2006, 02:16:04 PM »
None of the above.  :D

It is a HSD.



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