On Mon, 1 Feb 2021, Gene Heskett wrote:
Date: Mon, 1 Feb 2021 13:01:52 -0500
From: Gene Heskett <[email protected]>
Reply-To: EMC developers <[email protected]>
To: [email protected]
Subject: Re: [Emc-developers] My pi4b build is broken
On Monday 01 February 2021 11:10:39 Peter C. Wallace wrote:
On Mon, 1 Feb 2021, Gene Heskett wrote:
Date: Mon, 1 Feb 2021 11:01:16 -0500
From: Gene Heskett <[email protected]>
Reply-To: EMC developers <[email protected]>
To: [email protected]
Subject: Re: [Emc-developers] My pi4b build is broken
On Monday 01 February 2021 10:45:06 Peter C. Wallace wrote:
On Mon, 1 Feb 2021, Gene Heskett wrote:
That would be advantageous. But the 3 phase stepper servo's I've
fallen in love with don't make it available externally. They do have
an error output you can apply to the e-stop though and that is
downright handy.
Is there an index in the cable back to the driver from the encoder
on those? IDK.
I dont think any of the commom closed loop stepper drives have an
index on the encoder, but most step/dir driven servos do.
Does this mean the 2 phase closed loop stuff has it? One of the reasons I
migrated to the 3 phase is the smaller step, 1.2 as opposed to 1.8
degrees for a full step. That, and the machine noise is 5% of a 2 phaser
because these drivers only use coil current enough to do as they are
told. If the error goes up, so does the current. At working speeds it
moves like Casper the ghost. With the 1600 oz 2 phase on the Z, it shook
a 12" crescent wrench out of the chip pan, or tried like hell. I had to
put a 1/4 round fence on the edge of the keyboard table where the gear
box used to be as I broke keyboards and mice on the cement floor so many
times. Vibrated off. These are sweet, motor and driver at $120 a copy.
Thank you Peter.
I dont think any of the closed loop stepper drives support index
(since having and index or absolute encoder is not needed for these
drives unlike normal 3 phase servo drives)
Peter Wallace
Mesa Electronics
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