Hurco BMC 20 Ultimax 3 Retrofit

Thanks Andy,

I am going to work on the latency a bit more this week and weekend. I think I am about done with all my drawings and can get back to chasing wires and hooking things up. I do have a couple machines from a friend to try out to see if the latency is shorter on those. It seems to be a dell thing as multiple machines that are in the latency database that are Dells have long latency. I wonder if there is something in the BIOS that is causing it. I may swap video cards around to see if that helps at all also.

I need to write the code for the analog to digital conversion for the torque meters also, I wish I could get into the servopacks and grab that signal before it is converted to analog. But it appears the DAC's are buried in there.

I was thinking about using HAL ladder or something to set the interlocks up. It appears that the orient is to get the spindle in the right spot to be able to make a tool change.

Altium is making me mad today as I can not figure out how to modify a schematic library component, as I missed a pin and need to add one.

Sounds good on the latency, I'll try this one see what it does or try one of the other pc's


I was initially thinking about a TI msp430G2553 for the conversion, I may have a Arduino laying around somewhere if it can talk to it.


I think I remember seeing a hall sensor up on the top of the spindle, I think it's so the drive pawls can be in the slots of the tool changer fingers. I'm thinking the command will make the spindle crawl to that spot and the confirm is when it is in that spot.

Nice hard lesson of altium today, verify work has been saved. I have had a random issue with my PC when it goes to sleep it will not wake. Altium does not auto save, and it appears that either dropbox didn't update or ??? When it went to sleep it wouldn't wake back up so I turned it off and back on. Lost a bunch of hours of work on my second IO card drawing.

Progress tonight!!! Z and Y encoders work and show up. I didnt try the X as its a ton of work to manually move.

The Estop circuit is not working though. You could see the DI0 bit changing in the hal meter, but not actuating the estop.
Progress tonight!!! Z and Y encoders work and show up. I didnt try the X as its a ton of work to manually move.

The Estop circuit is not working though. You could see the DI0 bit changing in the hal meter, but not actuating the estop.

I am connected to ST1.1 to ST2.9 which is DI0 and ground. I have not molested this HAL file at all. I am still trying to wrap my head around all of this! From the code snippet it appears that DI0 is the correct input to trigger the input sequence. I am not sure if this is part of it as I would think the Estop would function no matter the system condition. But I could take it out of Estop in the GUI, but I could not turn the machine "ON" as it was giving me limit switch errors, as I have not hooked them up yet.

andypugh wrote:

Jake wrote:

Servo 1021419, 173278
Base 52365, 27403.

173uS is quite a lot of latency, but the system might still work OK because you have hardware doing the tight realtime.

Well, that is 17% of the typical servo cycle. So, it will mean that velocity will appear to fluctuate by up to 17% due to the sampling jitter. That is NOT good. I think Jake should try the isolcpus setting in the boot menu to see if that helps.

Jon

I did not get very far tonight.

I can not seem to get the "isolcpus" completed.

I log in under my normal log in.
go to command line su
type in password, its all happy.

open file /etc/default/grub

add isolcpus=1 (I have a dual core )

try to save. It says it can not open the file, try hitting open file, appears that it opens just fine. Same thing try to save and it will not let me stating same error.

Is this since I am not logging in as root from the beginning?

Also the wiki was not real clear on the 3.4-9-rtai-686-pae kernal

I am supposed to add the isolcpus=1 to the end of the GRUB CMDLINE_LINUX_DEFAULT="quiet splash" ? in the parenthesis or outside of them?

I only have the latest debian wheezy install on the machine and that is all.


On the productive side I have the PPMC properly mounted now and ready for some more wiring!


Thanks again!

Thanks Andy I'll try that tonight.



I am supposed to add the isolcpus=1 to the end of the GRUB CMDLINE_LINUX_DEFAULT="quiet splash" ? in the parenthesis or outside of them?

Thanks!