I have an nm 200 mill and it is having strange behavior in corners and 3-D contouring. It cuts straight lines and flats just fine. On curves and contours it oscillates and itís jerky, and slows way up from its normal speed. I cannot figure it out and I donít know much about the Mach settings. I have 2 other cnc machines and they work fine, (just fly though corners). Very smooth and fast. Itís almost as if the axis move and stop move and stop going over the contours. Now if itís a perfect flat circle. It will cut the circle fine. I am using rhino cad and rhino cam to design the parts and post the g-codes. I assume there is a problem in Mach 3 or the post processer. I hope this is not the way this machine operates. Is there any one that can help solve this problem? Thanks
Just a note, have you tried to add a G64 at the beginning of your program.
It might be useful, if you could post a video of it happening so we can see it. Oscillation is a bit vague.
Does it do it cutting air, or just under load?
You should not be using a G64 unless you have a corner rounding problem, a link below explains the use of a G64
CNC tip: How does G61 work?
I too played with a lot of settings. It's all I did with the dang thing. Never could get happy with any of them. Its not the fault of the machine itself if of course it doesn't have any major mechanical problems contributing to the issue. The Novakon driver box is filled with some very high quality Gecko Drivers and a CNC4PC breakout board.
I will be interested in hearing some of the solutions....... I gave it two months on and off and the boss was starting to fume that we were not making parts. I solved my "problems" with a different controller in a days time and a new DB25 jumper cable. I spend all my time making parts now on it rather than trying to make it run smooth. My Spindle actually runs reliably now too ! Do you have problems getting your spindle settings to stick and work correctly all the time ? It drove me nuts.
In any event, I replaced Mach with Flashcut. "Converting" in my case was rather simple, because the control PC they had integrated into the control cabinet had a traditional parallel port sticking out of the cabinet, and then they simply used a DB25 cable to come out of that and return back into another DB25 plug in the same box. That second DB25 was really the input plug on a CNC4PC interface board. That board was wired to the Gecko drives and I/O.
Essentially, all you need to do is make a new DB25 cable that will run from the Flashcut Signal Generator box to that input on the CNC4PC, one that remaps or changes pin configurations to match properly with functions. With the cable made, you will now basically be going from Flashcut to CNC4PC's board, which is completely generic anyhow. It works with any Step/Dir controller program.
As I recall, there are a few other things to do. One is to change a dip switch or pin plug on the CNC4PC board itself that dealt with Machs "Charge Pump". I think you can engage it or disengage it right on that CNC4PC board. The next thing is you need to disconnect the Spindle Inverters +/- 10 volt connections from the CNC4PC board and make a new wire to go from the FC Signal generator directly to the +/- 10 volt terminals of the Inverter.
It will be interesting to see if you have the same components in your newer NM200, but all in all, it's just about making a very good plan of attack on paper, then execute it and triple check all the connections before you turn things on. I really need to dig around and see... but I should have my diagrams of this conversion somewhere.
Now, I don't want anyone to think that Flashcut is the only option either. There sure are a lot of nebies on the market I am eager to learn more about. Just searching on USB CNC turns up a handful of controller programs, all worth a look I guess.
I dont like to be the Anti-Machx guy when so many seem to be using it, but dang it, I routinely seem to be plagued with non-working mach questions. Its not been suitable any time I have tried it (and I have really tried, and I am not new to this stuff). I have a fellow nearby who contacted me about his "machines". He built a router, put mach on it. He became so frustrated with trying to get his head around both solving the machine quirks and the software quirks he ended up selling the machine. He couldn't tell WHERE his problems really existed when he could not rely on the control. A few years later, he thought it probably got a little better and bought an X3 mill and converted it. He is once again struggling with trying to get it trustworthy as he works thru both machine and software quirks. Frankly, dealing with "quirks" on one side or the other is enough, not having to deal with TWO. Its like replacing bald tires with cheap bald tires. How long can you keep kicking yourself when one investment in NEW tires would give you years of trouble free service ?
I dont know what it is. But I have seen every company who jumps into Mach as their main control option struggle with quirks or at least desire for changes.... Tormach, Syil,..... And with the volume of people I do deal with, I am led to believe that there are a lot of "closet happy" Machx users that routinely deal with "issues". Obviously, some must really work... but I would bet there are many with "issues".
Its got to be inconsistencies with PC hardware. Thats all I can think of because for many, they seem to be happy, successful? or, perhaps they just have never had the opportunity to run OTHER control software to see the difference ? I dont know. All I know is I make PARTS with less fiddling to keep the darn settings working with a different control.
If I find my drawings, you'll be the first to know......