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How to tune again my a4988

Aldebaran94

How to tune again my a4988
July 13, 2018 02:30PM

Registered: 6 years ago
Posts: 99

Hello evryone.
Today I tried to change a4988 VREF, but I turned the potentiometer too far, so I don't know how to set 1.2v again. Can you help Me?
Thank you.

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o_lampe

Re: How to tune again my a4988
July 14, 2018 02:58AM

Registered: 8 years ago
Posts: 5,232

You can't turn the potmeter counterclockwise? If the wiper is blocked you can turn it 350° clockwise to achieve a 10° CCW correction.

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Dust

Re: How to tune again my a4988
July 14, 2018 03:13AM

Admin
Registered: 13 years ago
Posts: 6,998

You also may have damaged the pot terminally...

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Aldebaran94

Re: How to tune again my a4988
July 14, 2018 01:10PM

Registered: 6 years ago
Posts: 99

So, now I must change my driver. What's the best driver for the GEEETech Acrylic prusa i3?

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o_lampe

Re: How to tune again my a4988
July 15, 2018 03:14AM

Registered: 8 years ago
Posts: 5,232

Don't buy DRV8825 or TMC21xx drivers. They can give you a headache when you're unexperienced.
There are drivers with 1/128 microstepping, but AFAIK they require rewriting/reflashing the firmware ( Marlin on Ramps? ). Not recommended for beginners.

Why not stick to A4988?

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Aldebaran94

Re: How to tune again my a4988
July 19, 2018 09:27AM

Registered: 6 years ago
Posts: 99

Quote
o_lampe
There are drivers with 1/128 microstepping, but AFAIK they require rewriting/reflashing the firmware ( Marlin on Ramps? ). Not recommended for beginners.

Why not stick to A4988?

I've got a GT2560 Controll board, it has the same pinset of old ultimaker board. I don know anything about mecchanic and electronic, I bought this stepper motor [www.amazon.it]
I don't know If the a4988 are enought power to move this motor.

Edited 1 time(s). Last edit at 07/19/2018 09:50AM by Aldebaran94.

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dc42

Re: How to tune again my a4988
July 19, 2018 11:40AM

Registered: 10 years ago
Posts: 14,672

That motor is rated at 1A per phase, low enough to be driven by an A4988.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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Aldebaran94

Re: How to tune again my a4988
July 20, 2018 12:29PM

Registered: 6 years ago
Posts: 99

Quote
dc42
That motor is rated at 1A per phase, low enough to be driven by an A4988.

Ok, thankyou. If I want to achieve it on my MK8, I have to make a reduction?

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o_lampe

Re: How to tune again my a4988
July 21, 2018 02:47AM

Registered: 8 years ago
Posts: 5,232

I have a 1.2A stepper on my MK8 and it works reliable, just keep the retraction speed below 80mm/s.