Quantum 2.0 Test download (from art)

[Hood]

[Hood]

I'm just begain to test Mach3 on my lathe. At 25khz my Z axis speed cap is 140ipm but misses steps, It runs good a 95ipm with acceleration set to max . My question is will Q run my machine faster?

Quantum is not really meant for running a machine at the moment, it is not even at Beta stage yet

Hood

[wvancura]

Just viewed the video on the Quantum process. It reminded me of the Sigmoid functions I used to use to control electric arc furnaces in the late 90's. We used the Sigmoid function to prevent the control system from fatiguing the hydraulic system pipes while trying to quickly move several tons of carbon rod. Modern electrically operated hydraulic valves can create significant water-hammer effect when snapped from one flow rate to another. The difference was about 100 fold improvement in equipment life.

I can guarantee that your users will all be thrilled with the new control process, providing it does not impact the accuracy of the cut.

see http://mathworld.wolfram.com/SigmoidFunction.html for a little more about Sigmoids.

Bill

[rcrabb]

I did more tests. I ran the roadrunner file art always uses. Started at 60ipm tested again at 120, 140, and 180ipm. I have a home built 4 axis mill, Xylotex card with some nema34  6 wire steppers and 5 tpi ballscrews. I did notice a smoother toolpath with Quantum. Now I would like to say the file ran faster with quantum but I was able to get Mach3 to run the file just as fast with a lower excel rate. It wouldn't be fair to say Quantum ran the file any faster, only smoother. I realize that Quantum will allow higher speeds to be reached because of the smoother motion. I need to find a measurable way to test the motion. Maybe a ball on a spring or I can try to hang something on string so I can physically see the amount jerk. 

[Brian Barker]

Be sure to set your accel higher

[rcrabb]

I'm using max accel and path smoothing with Quantum and lower accel with Mach3 to get a smoother motion.

Brian, do you have any suggestions how I can measure jerk?

[Brian Barker]

Just put your hand in the machine and feel for a thump in the machine as it stops and so on. That is about all you can do other then getting and accelerometer

[Graham Waterworth]

A very simple way is to place a bucket of water on the table with the water level to the top and catch the spillage in a tray.  Compare the amount from each run. The less spillage the smother the run.

Not scientific but a fun comparison.

Graham.

[rcrabb]

All I want to do is provide some semi scientific data. I am a service tech for a company that builds tissue packaging machines. Most of the machines we work on have 20 axis all on electric cam profiles. I usually can monitor jerk, acceleration, following error etc with a laptop. Now with steppers not having any feedback loop things get more difficult. I like the bucket of water idea but with my luck I'll soak down something important. Maybe I'll get an accelerometer and log the data on my scope.

[Josh Hodge]

Not a good place to introduce myself so I will do that in another thread. I have been trolling for months on this site. I have even emailed BB some questions (so long ago he will not probably remember). I have finally ordered some parts to start building back my Thermwood model 35. It is a 3'X5' three  axis moving gantry machine.

All of that for me to say this I have a way to test with scientific results the movement of the control. I own a Renishaw Ball Bar System that should tell us a great deal of information that is traceable back to the NIST. My machine may be weeks/months away but if someone is close we could schedule a time to get together and I'll bring my ball bar.

Josh