Hi Peter,
Tuning is a possibility. You might make a move with the Step Response Screen and see if something shows up.
Hi Peter,
Tuning is a possibility. You might make a move with the Step Response Screen and see if something shows up.
TK
http://dynomotion.com
When traveling at longer distances you are reaching the max speed and staying there longer. Every digital system has a required time period in micro seconds that it requires to see a pulse. That value could be 2 micro seconds or it could be 10 or 15 micro seconds. Tom K can tell you what it is.
The higher encoder resolution the more accurate you should be able to control your moves, but also the easier it is to drop below the required minimum time window for a pulse to be identified. If you have access to an O-scope you can measure it. Alternatively you can try reducing your max IPS movement by 10 or 20%.
I have had counting issues in one direction before, and every time it was an encoder problem:
- Pull up resistors needed (Dynomotion),
- Pull up resistor damaged (unrelated project),
- "Upgraded" an encoder to one with too many lines of resolution (that was a motor controlling angular position and it required a 10 microsecond pulse. Above 6000 rpm we were dropping into the single digits and we started randomly missing counts)
GreggMI
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Yes, I have the original docs. on these drives and the tuning of them; however, I have been putting off these drive board tuning hoping I had to only tune through Kflop and in general it has worked ok. I am thinking it is now time to start tuning on the original drives and then re-tuning with Kflop. But both these types tuning really challenge me in getting it correct.
Swapping boards will certainly prove the issue is an excellent idea. I do know that the Y-axis tuned very good in Kflop when I did it 2+ years ago.
I was told by another guy that the humidity / temperature can play a big role on tuning these old drives and it has been 90-95°F. with over 75% humidity the last few weeks in NC. I really need to get some AC going in the garage as well to keep a more constant temperature.
I will post back once I attempt a few things .... thanks for all the reply posts.
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