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Friction compensation gives no effect

Created by: boomeeeer at: 5/20/2014 6:50 AM (9 Replies)

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5/20/2014 6:50 AM	Rate (0)
boomeeeer Experienced Member Joined: 10/19/2011 Last visit: 11/19/2024 Posts: 31 Rating: (2)	Hello. I faced the problem. The machine with 840D has a "quadrant error". I wanted to eliminate it via friction compensation. I do the circularity test and see the error. Next I try to compensate it by entering values in MD 32520: FRICT_COMP_CONST_MAX and MD 32540: FRICT_ COMP_TIME but it gives no effect (in my case MD 32490: FRICT_COMP_MODE = 1, MD 32500: FRICT_COMP_ENABLE = 1, MD 32510: FRICT_COMP_ADAPT_ENABLE = 0). What’s wrong? I did it before and it worked. Maybe I forgot something? Could you give me some advice please?

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5/20/2014 8:41 AM	Rate (0)
PISCEAN 2010 Diamond Expert Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (882)	Hello, Do you expect friction compensation to eliminate the errors & should give exact position as per the set or comand value? Can you attach the graph or report of circuilarity test before & after enabling friction compensation?

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5/20/2014 10:44 AM	Rate (0)
boomeeeer Experienced Member Joined: 10/19/2011 Last visit: 11/19/2024 Posts: 31 Rating: (2)	PISCEAN 2010 Hello, Do you expect friction compensation to eliminate the errors & should give exact position as per the set or comand value? Yes PISCEAN 2010 Can you attach the graph or report of circuilarity test before & after enabling friction compensation? Now I can't. But I'll describe. Basically we do the work which doesn't involve circular interpolation. Nowadays we faced with it. When I do the circularity test I can see the error in quadrant transition points about 0.17mm for one of two axes involved in test (in the end, I see it on the finished part with my eyes). By doing circularity test I see the same picture for: 1) MD32490=1, MD32500=1, MD32510=0 and values in MD32520/32540 2) MD32490=1, MD32500=0 3) MD32490=0, MD32500=0 For first case I try to enter a wide variety of values for MD32520/32540 and it doesn't matter. I'm really surprised.

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5/20/2014 11:28 AM	Rate (0)
PISCEAN 2010 Diamond Expert Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (882)	boomeeeer PISCEAN 2010 e? Yes PISCEAN 2010 Can you attach the graph or report of circuilarity test before & after enabling friction compensation? When I do the circularity test I can see the error in quadrant transition points about 0.17mm for one of two axes involved in test (in the end, I see it on the finished part with my eyes). For first case I try to enter a wide variety of values for MD32520/32540 and it doesn't matter. I'm really surprised. Hello, Machine mechanics needs to be improved in your case which shall minimise error. You cannot expect system to compensate error of 0.17 mm.

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5/20/2014 7:30 PM	Rate (0)
Ekalavya Posts: 2964 Rating: (484)	boomeeeer Hello. I faced the problem. The machine with 840D has a "quadrant error". I wanted to eliminate it via friction compensation. I do the circularity test and see the error. Next I try to compensate it by entering values in MD 32520: FRICT_COMP_CONST_MAX and MD 32540: FRICT_ COMP_TIME but it gives no effect (in my case MD 32490: FRICT_COMP_MODE = 1, MD 32500: FRICT_COMP_ENABLE = 1, MD 32510: FRICT_COMP_ADAPT_ENABLE = 0). What’s wrong? I did it before and it worked. Maybe I forgot something? Could you give me some advice please? Hello , Have you enabled / purchased the Quadrant error option bit and checked ? Does your all axis are properly optimized and checked ? Regards, Prakash
Ekalavya Posts: 2964 Rating: (484)
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5/21/2014 5:39 AM	Rate (0)
boomeeeer Experienced Member Joined: 10/19/2011 Last visit: 11/19/2024 Posts: 31 Rating: (2)	Ekalavya Quadrant error option bit Where is it?

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5/21/2014 8:25 AM	Rate (0)
Ekalavya Posts: 2964 Rating: (484)	boomeeeer Ekalavya Quadrant error option bit Where is it? Hello, You can find it in License certificate if you have purchased. Normally option bit need to be entered in the machine data with resepect to the license certificate Regards, Prakash
Ekalavya Posts: 2964 Rating: (484)
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5/21/2014 10:15 AM	Rate (0)
boomeeeer Experienced Member Joined: 10/19/2011 Last visit: 11/19/2024 Posts: 31 Rating: (2)	Ekalavya You can find it in License certificate if you have purchased. I've never seen the License certificate. It's slightly old machine. I think that manufacturer entered this bit during comissioning. I'm just service man on a plant. How can I check this option bit? In MD9990? How can I find this MD maybe it hidden (I couldn't find)? I suppose that the error appears on a display when I try to use unsupported option.
	Last edited by: boomeeeer at: 5/21/2014 10:18 AM
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5/21/2014 7:34 PM	Rate (0)
SteveA Posts: 297 Rating: (42)	Normal reversal comp (32490=1) is standard, no option required. Only the adaptive reversal comp requires an option (32490=2). The parameter 32490 only takes effect after a control restart. Did you do an NCK reset after changing it? HTH, SteveA
SteveA Posts: 297 Rating: (42)
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5/22/2014 5:08 AM	Rate (0)
boomeeeer Experienced Member Joined: 10/19/2011 Last visit: 11/19/2024 Posts: 31 Rating: (2)	SteveA Did you do an NCK reset after changing it? Yes.

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