Having problem with blending arcs together

Hi Jochen!
I'm developing a 3-axis plasma cutter software. It's uses g-codes for calculating the path of motions and using blend function for continous moves. Everything works fine including continously blending short straight line moves, but sometimes blending arcs resulting high following error. Mainly when i try to blend little arc segment with a big one. This problem doesn't occur when i set blend factor to 0. I tried many different trajectory and arc parameters with the "Sequence of Blended Lines and Arcs.vi" example, but it resulted the same effect. With some trajectory parameters i can blend the short arc segment with the big one without following errors, but i still don't know what causes this problem. This situation is same on two different cnc machine. One of them is using 1 servo and 2 stepper axis in closed loop with different encoder resolutions. The other one is using 3 stepper axis with different step/rev in open loop. The effect is the same. Blending little arc with a big one (approximately r1:r2=1:8), resulting following error and the motors jumps a little.
- PCI-7340, umi-7774
- LabView 8.5, Motion 7.6
Waiting for hints! Thank you!

Nandi,
sorry for the late response, but I have had to gather some equipment first to reproduce this behavior. I have setup a very similar system with a servo and a closed loop stepper and I have used your code for a test.
The bad news is, that I couldn't reproduce the problem. First I have worked with two servos but I couldn't see a significant following error with those, but in fact I wouldn't have expected a sustaining following error with a servo at all, as servos can compensate following errors during the moves.
In a next step I have used a servo and a closed loop stepper but I have seen the same result. No significant following error during the move. I have also switched the X and Y axes, but there was no change. I have also played around with the other move parameters but again, no significant following error.
With this said, I don't think that we are facing a general issue here that is related to 73xx motion control boards.
To me this looks more like an issue that is related to problems with load inertia and high acceleration values. In fact if you reduce the radius of an arc but keep the vector speed, the forces become higher and in your case they seem to become too high for the stepper motors. A stepper motor can't compensate step loss during the move. That's why you see this constant following error.
I hope this analysis hits the bull's eye.
Kind regards,
Jochen

Similar Messages

Is anyone having problems with blends on a Mac?

I have a Macbook Retina and I have downloaded a trial of Illustrator CS 6, which I will probably purchase. I have a file where I have used some blends, and when I save the file back to CS 5 or just as a PDF from CS 6, It messes up my blends. Am I doing something wrong? Has anyone had this problem?

Define "messes up".
You're aware that some appearance aspects may be expanded when you back save to legacy versions, right? And this may also effect saving as PDF depending upon the job options.

I am having problem with MDV Studio.

Hello happy guys, whatzup? Guess all ya 'r doing fine? Right!
I am using Dreamweaver from Macromedia Studio 2004. I am having problem with Inserting Record into Access database using the forms I create on my .asp document. I am using IIS and Javascript as my Document Technology. The error I usually have is:
"Technical Information (for support personnel)
Error Type:
Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
[Microsoft][ODBC Microsoft Access Driver] Operation must use an updateable query.
/site_files/user_regform.asp, line 78
Browser Type:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/530.5 (KHTML, like Gecko) Chrome/2.0.172.28 Safari/530.5
Page:
POST 41 bytes to /site_files/user_regform.asp
POST Data:
uname=Honesty&pword=admin&MM_insert=form1
Time:
Tuesday, June 02, 2009, 1:49:39 PM"
Please I need assistance on how to solve this problem. Thank you.
Similarly, I don't really know how to write sql strings - I just give commands and Dreamweaver will generate the sql strings. Yet, I still observe errors. But I think, for the sql aspect, I'm undergoing a tutorial note that I downloaded on the internet.
Please help me to solve this error problem at the moment. The sql knowledge is not the problem. I can get that at my leisure.
Thank you.
Eyo Eyo (Nigeria).

It sounds like you do not have an internet connection (wifi arcs in the upper left does not mean you have a connection) since Safari does not work also.. Try the following:
- Reset the iPod. Nothing will be lost.
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Power off and then back on the router
- Reset networks settings: Settings>General>Reset>Reset Network Settings
- iPhone and iPod touch: Troubleshooting Wi-Fi networks and connections

Having problems with latest McAffee SiteAdvisor version

RE: Firefox 3.6.15; McAfee SiteAdvisor v3.3.1.125 --- Firefox and the extension/addon McAfee SiteAdvisor v3.3.0.176 was working fine - no problems. However, since the release of 3.3.1.119 and 3.3.1.125, either Firefox or SiteAdvisor are not working together. I have had to disable SiteAdvisor for Firefox to run properly. I was wondering if anyone else is having problems with SiteAdvisor. Thanks.

I have a same problem like no.2.
Finally, I fixed it.
First, You have to ungroup the footer objecs.
Second, Group again that.
Then export your site.
Please try this!
I hope this will be of some help.

I downloaded OS X Lion on my iMac and I'm having problems with my computer waking up after hibernating. I can get to the login screen but my mouse will be frozen. The only fix's is a hard reboot. Any help would be great!

I downloaded OS X Lion on my iMac and I'm having problems with my computer waking up after hibernating. I can get to the login screen but my mouse will be frozen. The only fix's is a hard reboot. Any help would be great!

Try resetting the SMC and the PRAM.
1. SMC
Read this and follow the instructions for your kind of mac:
http://support.apple.com/kb/HT3964
2. PRAM
Follow the procedure below:
1. Power down the machine.
2. Locate the following keys on your keyboard in preparation for Step 4:
command–option–P–R
3. Press the ‘power on’ button.
4. Immediately – and before the grey screen appears – hold down ‘command-option-P-R’ all together.
5. Keep them held down until you’ve heard the start-up chime twice. After you release them you should hear it again, and hopefully your Mac will boot up as it should normally.

HT1222 I am having problems with my iPhone. It won t turn on, I believe it was charged , it has

I am having problems with my iPhone. I tried charging it nothing happened. It did not fall, it just shut down?

try doing a reset, hold down the home/power button together until you see the apple logo and then release. Then wait for you phone to boot back up.

Having problems with adobe premiere 8 freezing. cannot playback my videos. also, when i try to burn to DVD, does not recognize burner.

having problems with adobe premiere 8 freezing. cannot playback my videos. also, when i try to burn to DVD, does not recognize burner. losing my work constantly cause of freezes and crashes.

sunchick116
Thanks for the reply.
Anytime I am getting too far ahead, then let me know and we can work together on putting the essentials together for this troubleshooting.
From your screenshot, you have a Windows 7 apparently 64 bit computer, lots of RAM. That computer would be great for Premiere Elements 11 Windows.
But Premiere Elements 8 is only a 32 bit application running in the 32 bit compatibility mode of your 64 bit system. So all that RAM is excessive in a 32 bit system with its limitation of max supported installed RAM being 4 GB (of which 3 GB or less of that are available).
So, the freezing and such could be explained by limited resources depending how much you have in the project when the freezing occurs and what formats are involved - like AVCHD. The burner not being recognized by Premiere Elements is probably another matter.
Let us start here....another place where you could be getting hit on the resource side of things....
1. Background Rendering and AutoAnalzyer features in version 8 are notorious for grabbing system resources. If you have them enabled, that could account for much of the program freezing. So, please make sure they are not selected.
a. Background Rendering. In the Premiere Elements 8 workspace, go to Edit Menu/Preferences/General, and make sure there is no check mark next to Background Rendering option.
b. AutoAnalzyer. In the Premiere Elements workspace, click on the Organizer tab in the row below the selected Organize header in order to open the Elements Organizer. In the Elements Organizer workspace, go to Edit Menu/Preferences/AutoAnalyzer Options and uncheck all the option under that.
To get back to the Premiere Elements workspace from the Elements Organizer workspace, in the Elements Organizer workspace go to File Menu/Exit.
For most of us, Premiere Elements 8 was unusable without the 8.0.1 Update. Did you install that? Have you ever worked successfully with your Premiere Elements 8 on the computer where it is now? And, was that with or without the 8.0.1 Update?
Let us stop here and see how we are doing.
Lots of other factors to get into including the burner recognition one.
Thanks for looking at the troubleshooting comments.
ATR

Having problems with Bridge shutting down after saving photo in PS Cs5,,,,,,,,, Also when i attempt to update either PS or bridge get an error message in Adobe application manger "Error loading updater workflow"

Having problems with Bridge shutting down after saving photo in PS Cs5,,,,,,,,, Also when i attempt to update either PS or bridge get an error message in Adobe application manger "Error loading updater workflow"

Sorry for the late reply. My email firewall has become a little over zealous & sent a lot of my emails straight to my junk email folder, so I have only just now discovered your reply in my junk mail folder.
The only "don't open files exceeding xxx megabytes" instruction I can find in my Prefs, is in the Bridge Prefs for Thumbnails, & mine is set at 1000mb. The biggest files I handle are bigger than 200mb so I should be able to open a few, not just one.
However, this doesn't explain why I can open a psd format file of 180mb, close it, but then can't open a RAW format file of only 26mb immediately after.
I can open the RAW file only if I restart my computer - very annoying!
However, thanks for the advice about the video card & memory.
So, I'm still stuck as to what the issue is.

Is anyone having problems with the battery heating up and draining the power? Mine has been doing this for about 2 months now.

Is anyone having problems with the battery heating up and draining the power? Mine has been doing this for about 2 months now.

This is a major problem with Lollipop, but yo said it started 2 months ago. Several people have fixed problem by removing FaceBook And Face book messenger and then re loading the apps again. You might want to clear your cache before reloading. Not sure this is your problem, but worth a try. Good Luck

I am having problems with creating my apple id. On the phone it is advising me that the ID is not created and then when i do it online it says that it has been created. Can you advise me on what to do please?

I am having problems with creating my apple id. On the phone it is advising me that the ID is not created and then when i do it online it says that it has been created. Can you advise me on what to do please?

Apple ID FAQ http://support.apple.com/kb/HE37

HT1657 I am having problems with sound in my rental movies

We rent movies all the time but lately we are having problems with sound for our movie rentals. We watch the first half hour without a problem than the voice is choppy all the time. Sometimes it is good for five minutes than noting for a while. We have tried everything we could think of with no avail. I could see one movie but the last 5 or so have been the same. Done trying we need to fix this! Help! Any ideas?

First try resetting your iPad by simultaneously pressing and holding the Home and Sleep/Wake buttons until you see the Apple Logo. This can take up to 15 seconds so be patient and don't release the buttons until the logo appears. Try again to see if the problem persists.
If you still have the same issue, it's possible that something is lodged in the earphone jack. This can cause the iPad to think earphones are plugged in when they are not. Use a vacuum to try to suck any dust, lint or other foreign matter from the jack. If that still doesn't work, try CAREULLY using a toothpick.

Hi Can anyone help. I'm having problem with FaceTime on my IPAD .It connects but cuts out Simolarly when someone calls me it connects , then cuts out ThanksBrian

Hi Having problem with FACETIME on my IPAD Connects to call but then cuts out , similarly calls in connect & cut out Can someone help. Brian

My ipad is doing the same thing to it won't let me except a incoming call on Facebook and I don't know what to do

I am using my Ipad on a remote craftshow site and am having problems with battery lasting 8 hrs. Can I use a 12v rv battery to recharge it or atleast maintain the charg over longer periods of time? I have a dc adapter. thanks

I am using my Ipad on a remote craftshow site and am having problems with battery lasting 8 hrs. Can I use a 12v rv battery to recharge it or at least maintain the charge over longer periods of time? I have a dc adapter. thanks

You should be able to use the battery if you get a car type charger which recharges mobile devices.
The full size iPads use a 10-12W charger, whereas the mini uses a 5W charger. Many car chargers only supply 5W. But at 5W, the car charger should give you some extra time on your iPad. It would be best to use a 10-12W car charger.
 Cheers, Tom

I am having problems with my music collection, after burning all of my music to the computer I organized it into folders and placed it in the iTunes Folder. Starting on a new computer now. I can get my music from old computer?

I am having problems with my music collection, after burning all of my music to the computer I organized it into folders and placed it in the iTunes Folder. As of now i realize this was a mistake. Starting on a new computer now. I cant get my music to transfer from the itunes folder on the old computer? I keep getting error "Can't Read from the source file or disk." Whenever I got to folder properties its always checked read only. But when i play the song it works just fine. Im sure this is just because I added music into itunes folder but is there anyway to fix it?

WMA files are 'window media audio' files, which is a Microsoft format. If you want to add them to your iTunes library on your Mac then you will need to convert them into a compatible format first. If you still have your windows machine then iTunes for Windows can convert them from WMA to MP3 format : https://discussions.apple.com/message/24158701#24158701
Or try a search for, for example, 'convert wma to mp3' to find programs to convert them.

I am having problems with my itunes, when plugging my iphone or ipod to the laptop - i can see iphone/ipod in the top right corner of itunes but when i click this to the see what is on theis iphone/ipod the option is no longer there, this was working

I am having problems with the new itunes set up ........
when i plug in my iphone or ipod touch it shows in the top right hand corner of itunes
BUT when i click on the shown iphone/ipod the icon its no longer there, i was useing this fine yesterday and it was showing yesterday what is on this ipod and would allow me to add/remove music, but now this option is no longer availlable - i have added a couple of albums to my itunes i can listen to the music from the laptop but cannot sync the ipods to trancefer these albums to the handheld devices -
i have been trying to sort this all day with no luck not sure if there is a problems with itunes or is it something i am doing ????
HELP !!!!!!!!!!!!

BOB we need you urgently
Perhaps Bob will see this thread, he is the professor in these cases.
You do not use a WEP password but wpa/wpa2 on router and equipment.
All equipment connects to WiFi, but for your iPad.
Even with all other equipment WiFi off, you cannot connect your iPad.
Your iPad connects to other WiFi nets correctly.
All resets etc done on iPad and Router.
Still I am not sure it is your router for sure, frustrating...
I want to test 2 other things:
1. in your iPad, set everything OFF in Settings/Cellular, turn off/then/on your WiFi, and see whether it will still not connect...
2. If that does not do it: disconnect the router as well as the modem from the power, for 15 seconds, then reconnect the modem, let it fully start, then reconnect the routet let it fully start, turn of your WiFi in iPad, then on, and see whether it will connect.

Having problem with blending arcs together

Similar Messages

Maybe you are looking for