Re: Real acceleration during jerk February 27, 2019 08:28AM |
Registered: 10 years ago Posts: 14,672 |
Quote
ArtemKuchin
I don't know about reprap software, but marlin seem to use jerk as starting speed from zero. Yes, it is a threshold speed. For speed below JERK acceleration is not used, for speed = or > JERK acceleration is used. Again, i am talking about marlin firmware, sorry.
So, if motor starts at JERK the firmware pulses to drivers STEP input at frequency which will result in JERK speed (taking into account steps/mm settings).
Re: Real acceleration during jerk February 27, 2019 08:45AM |
Registered: 7 years ago Posts: 49 |
Re: Real acceleration during jerk February 27, 2019 09:05AM |
Registered: 10 years ago Posts: 14,672 |
Re: Real acceleration during jerk February 27, 2019 09:14AM |
Registered: 7 years ago Posts: 49 |
Re: Real acceleration during jerk February 27, 2019 09:25AM |
Registered: 10 years ago Posts: 14,672 |
Quote
ArtemKuchin
Really, even when you accelerate the motor
you have to change the speed from zero to v1 and then to v2=v1+delta then v3=v2+delta, so, delta is jerk.
At what threshold would you start calling this delta not acceleration but jerk?
Re: Real acceleration during jerk February 27, 2019 09:32AM |
Registered: 7 years ago Posts: 49 |
Re: Real acceleration during jerk February 27, 2019 09:37AM |
Registered: 6 years ago Posts: 1,007 |
Re: Real acceleration during jerk February 27, 2019 09:39AM |
Registered: 7 years ago Posts: 49 |