Re: Testing the effects of microstepping and segmentation on print quality April 06, 2017 10:03AM |
Registered: 8 years ago Posts: 916 |
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o_lampe
edit: The ROSC pin is already connected to the pad and grounded through the 010 resistor ( maybe not in full fast decay mode though )
[attachment 92712 A4988_ROSC.jpg]
Re: Testing the effects of microstepping and segmentation on print quality April 06, 2017 11:16AM |
Registered: 10 years ago Posts: 732 |
Re: Testing the effects of microstepping and segmentation on print quality April 07, 2017 09:51AM |
Registered: 10 years ago Posts: 732 |
Re: Testing the effects of microstepping and segmentation on print quality April 07, 2017 11:14AM |
Registered: 10 years ago Posts: 14,672 |
Re: Testing the effects of microstepping and segmentation on print quality April 07, 2017 11:16AM |
Registered: 8 years ago Posts: 916 |
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hercek
Edit: Based on this schematic: [a.pololu-files.com]
The resistor you removed should have been 10 kΩ which corresponds to OFF time 12 µs, fast decay time 3.8 µs, blanking time always constant at 1 µs.
Re: Testing the effects of microstepping and segmentation on print quality April 07, 2017 12:35PM |
Registered: 10 years ago Posts: 732 |
Re: Testing the effects of microstepping and segmentation on print quality April 07, 2017 12:41PM |
Registered: 10 years ago Posts: 732 |
Re: Testing the effects of microstepping and segmentation on print quality April 08, 2017 06:14PM |
Registered: 10 years ago Posts: 732 |
Re: Testing the effects of microstepping and segmentation on print quality April 12, 2017 10:50AM |
Registered: 8 years ago Posts: 916 |
Re: Testing the effects of microstepping and segmentation on print quality April 12, 2017 11:42AM |
Registered: 8 years ago Posts: 5,232 |
Re: Testing the effects of microstepping and segmentation on print quality April 12, 2017 07:06PM |
Registered: 8 years ago Posts: 916 |
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o_lampe
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I'm starting to really wonder why no drivers ever seem to be in the best mode by default. Why should we always have to mod them???
The best mode is a quiet stepper for some of us ( running and/or holding), others prefer the best torque.
Mixed decay is a compromise.
Re: Testing the effects of microstepping and segmentation on print quality April 12, 2017 07:29PM |
Registered: 10 years ago Posts: 732 |
Re: Testing the effects of microstepping and segmentation on print quality April 12, 2017 09:02PM |
Registered: 8 years ago Posts: 356 |
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nebbian
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o_lampe
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I'm starting to really wonder why no drivers ever seem to be in the best mode by default. Why should we always have to mod them???
The best mode is a quiet stepper for some of us ( running and/or holding), others prefer the best torque.
Mixed decay is a compromise.
My SD6128's were quieter, and more accurate after modding.
Re: Testing the effects of microstepping and segmentation on print quality April 12, 2017 11:37PM |
Registered: 8 years ago Posts: 916 |
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GroupB
you have to mod them ? dont you just have to turn the decay pot to go fast or mix ... Got a decay pot on my thb6128
Re: Testing the effects of microstepping and segmentation on print quality April 13, 2017 06:32AM |
Registered: 10 years ago Posts: 732 |
Re: Testing the effects of microstepping and segmentation on print quality April 13, 2017 07:35AM |
Registered: 10 years ago Posts: 14,672 |
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hercek
The TMC2660 drivers on the Duet board seem to be pretty good. Unfortunately they cannot be put on a separate driver board for e.g. RAMPS since they need to be configured via SPI.
Re: Testing the effects of microstepping and segmentation on print quality April 13, 2017 02:41PM |
Registered: 10 years ago Posts: 732 |
Re: Testing the effects of microstepping and segmentation on print quality April 13, 2017 02:51PM |
Registered: 10 years ago Posts: 14,672 |
Quote
hercek
A4982 driver do not have fast decay mode. Only slow or mixed decay. The default mixed decay does not kick in when the current is raising. But it can be set so that mixed decay is active all the time (I guess that is what you meant by "always configured in fast decay mode").
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Low Current Microstepping. Intended for applications where the minimum on-time prevents the output current from regulating to the programmed current level at low current steps. To prevent this, the device can be set to operate in Mixed decay mode on both rising and falling portions of the current waveform. This feature is implemented by shorting the ROSC pin to ground. In this state, the off-time is internally set to 30 μs.
Re: Testing the effects of microstepping and segmentation on print quality April 23, 2017 09:12AM |
Registered: 8 years ago Posts: 916 |