High speed machining

I am looking to retrofit/build new machines and i am trying to decide either to use a normal cnc control ie fanuc,seimens,yasnac,mitsubishi I have not have good success getting mach 3 to run fast enough
I am looking for cutting speeds of 300-500 IPM with max feed rates 1200-2000 and all of this needs to be short lines 3d moves can linux cnc come close to achieving what I need?
I have a new okuma with the OSP control and I have used feed rates upto 800 IPM and its smooth as silk thats the kinda results i am looking for.


here is a sample of the code I am running
even a haas can run this code ( a haas can only run up to about 60 IPM before is starts getting jerky)

Hi

How fast a machine can run is completely down to the machine itself.

The humblest desktop can output instructions far faster than any mechanical machine can execute them.

If it is the actual code that causes the problem and your code is CAM generated and made up of thousands of short lines, the new trajectory planner may greatly
improve the performance.
It blends the path instead of treating each as an individual move, with acceleration followed almost immediately by decceleration to almost stop, then the next move etc.
www.linuxcnc.org/index.php/english/forum...stersprograms-wanted

Hopefully skunkworks or someone else on that thread may have a machine set up that can run your code and advise how it runs

regards

Just looking at the code, it isn't ever going to go 300-400 ipm because the feed rate is programmed to a max of F100, with lots of other F speeds set (some as low as F7).

If the code were programed to go at 300-400 ipm and if the machine were capable of the necessary accelerations to achieve those speeds in the programed movements, then Linuxcnc should be able to do it.

Other than the code slowing its self down I don't see any reason it shouldn't run. (it seems to run fine in simulation)

It looks like your CAM program is trying to be too clever, and program in decelerations to keep the code within the machines capabilities. That isn't necessary in Linuxcnc. Linuxcnc's trajectory planner is smart enough to limit speeds to the machine's max accelerations (provided you have correctly configured your machine in Linuxcnc).

On my test it runs in 26 seconds and maximum feed rate seems to be 100 IPM

if I limit the accel to 1G (but dont limit the feed rates) I get 8 seconds
(not that many machines are comfortable with 1G acceleration)

PCW thank you for that bit of info here is the same program as It would run on the Okuma and remember this is a 1/8 4f carb em running dry insteel about 30 hrc

I do run tools at cutting feeds of over 300 IPM the first program wast just all the haas can do (it cant run smoothly over 60 IPM its a haas)

Todd I am programming with solidcam I Machining thats why all the fed rates it maintains chip load on the tool (its agressive and it works)

I guess what i am asking is can linux run the code maintain its speed without getting jerky like a haas or mach3 does ( I am not even considering steppers )

so long as your using servo drives with a decent interface i.e mesa or ppc , i dont see a problem , and that the servo's are tuned etc
as Todd says , it's not Linuxcnc that is the problem , it's how you setup and interface it , and don't take cam programs defaults either , truly set it up to suit the machine

their are many machines running linuxcnc professionally in a production environment , at the end of the day it's how it's setup and the care taken to do so .