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Post by mattdh on Oct 5, 2013 13:00:29 GMT -5
jalvis-
did you send your saw in for repair? if so- how long was the turn around? or did the just send you a new module and you did the repair?
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Post by jalvis on Oct 8, 2013 10:12:04 GMT -5
jalvis- did you send your saw in for repair? if so- how long was the turn around? or did the just send you a new module and you did the repair? No, I didn't send it in. Timberwolf sent me a knew Module. The saw worked fine at the highest speed so I just continued using it until the new module arrived. The module is really simple to change and only takes minutes.
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Post by GhostFist on Oct 8, 2013 13:10:17 GMT -5
Woodie, are you saying that while under load, as in when the saw is cutting material, the pulsing goes away? Was just having a discussion with one of our electricians on set here regarding this problem and he's scratching his head on it. As of writing this I still have not received a response from Mafell.
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Post by jaymon5 on Oct 8, 2013 19:15:14 GMT -5
Ghostfist, my saw pulses underload and on free run at the lower speeds (1-3). Some of the comments from Jalvis suggest to me that there are some circuitry issues when the motor and control circuit is powered with 120V 60hz. It almost seems like the motor control is not optimized for the higher current (lower voltage) that we have in the states, so the result is that the control circuit keeps on turning the motor on and off.
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Post by GhostFist on Oct 8, 2013 19:32:49 GMT -5
Ya I was discussing that too but we were kind of confused that this saw only pulses at lower power. You'd figure (if you're a layman like myself) that if 60hz was the issue it would constantly be screwing up. but theres obviously some sort of something not happening properly here. If the saw is unable to make a cut at the lower speed then that seems to me that it's a fault.
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Post by jaymon5 on Oct 8, 2013 21:20:39 GMT -5
I agree. I was hoping that you would have had a response from Mafell by now. Maybe the slow setting is too slow as mentioned before. What is hard to believe for me is why this would be normal? At the higher speeds when you start cutting the saw speed slows down slightly but remains constant, at the lower speeds, why does the motor appear to be turning on and off? It seems that the control circuit keeps overshooting target current to motor (motor going too fast or motor going too slow).
It is also possible at the lower speeds that the "soft start" function that slowly ramps the current to the motor could be compounding the problem. This seems to have an effect when you start the motor on the low setting. This would explain my saw pulsing when starting the saw with no load at speed 1, and running the saw running more smoothly when starting the saw at a high speed and then turning the speed to 1 (with no load).
I will try and get a hold of Mafell CS, and hope to get some answers...
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Post by jaymon5 on Oct 8, 2013 21:24:09 GMT -5
on a positive note. this saw is simply magic cutting through hardwoods like purple heart and rosewood. There is no messing around when joining tracks and cuts are straight (like they should be).
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Post by GhostFist on Oct 8, 2013 22:17:57 GMT -5
I agree and I'm still hard pressed to find a situation where I will need the lower settings but that seems to be ignorance on my part. Jaymon, how old is your saw?
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Post by woodie on Oct 8, 2013 23:45:16 GMT -5
Woodie, are you saying that while under load, as in when the saw is cutting material, the pulsing goes away? Was just having a discussion with one of our electricians on set here regarding this problem and he's scratching his head on it. As of writing this I still have not received a response from Mafell. I haven't heard anything from Mafell Germany on this either. Their Facebook page suggests they may be at another woodworking show though, so this could explain the delay. Jalvis's comment regarding the saw speed being too low on the lower settings piqued my curiosity... so I did what any normal person would do and got a laser tachometer, that is normal right? Anyway it seems he hit the nail on the head. I tested the saw plugged directly into a wall outlet and plugged into my Festool CT26's outlet with the vacuum set to high. I mentioned early on in this thread that the saw seemed to run better when connected to the vac but I had no way of verifying this. Well it seems it's true, at least with my saw. Both tests where using the same outlet/circuit and I ran the saw several times on each just to verify the consistency of the results.
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Post by woodie on Oct 8, 2013 23:51:49 GMT -5
I'm still left wondering why the saw performs better through the vac with it running? Blade speed increased on nearly every speed? I expected the opposite to happen.
On the plus side my saw does seem to be smoothing out. Speed 3 is now the only one I get occasional surging on. When I started speed 3 would consistently surge from 2900rpm to 3900rpm but now I'll just get an initial surge or two then it seems to settle in at 3900rpm.
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Post by jaymon5 on Oct 9, 2013 12:31:36 GMT -5
Nice work Woodie. I believe that brings us closer to the truth. My saw is only a month or so old. I will check to see if there is a difference on my side with the CT26 inline.
Up to now all my no-load tests have been without the CT26 and load tests were conducted with the CT26 connected. It is interesting that measured comparisons vs manual listing, put the operating range at levels 3 -6 approx. actual.
Did you have a chance to measure line voltage out of the CT and wall outlet?
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Post by GhostFist on Oct 9, 2013 13:19:26 GMT -5
Guys this is exactly why this forum was started. Thank you. We will find a solution.
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Post by GhostFist on Oct 9, 2013 14:00:34 GMT -5
I'm still trying to figure out if hz differences (50hz Europe, 60hz NA) is having an effect in this somehow. Now I'm an electrical moron so don't really understand how this all translates but from what I've been reading, hz difference can result in running at less than full power when running a 60hz device on 50hz. What I don't get is that the saw seems to run great at full power but when tuning the saw down we get the problem. I'm assuming (because I don't know) that the overflow would cause problems at full power and level out as you tuned the saw down, but we're getting the opposite effect here. we could be barking up the wrong tree with current issues though power differences when running on a vac still makes me want to research these lines. If woodie's saw is indeed starting to level out then it's still possible it's a brush wear in issue.
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Post by fidelfs on Oct 9, 2013 15:15:45 GMT -5
I believe that is the case. All machines electrical and mechanical need break in period. Do they need an special break in period? that is different question.
I think our machines are too new and they will behave better.
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Post by GhostFist on Oct 9, 2013 15:35:20 GMT -5
I sure as hell hope so, but I'm not ruling anything else out just yet.
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