On 12/4/24 06:21, Leonardo Marsaglia wrote:
Hi Andy,
7i89?
Not as many encoders, because there are not as many pins...
Leonardo, If looking for a bunch of encoders, Peter may be able to build
a 7i90HD file to order. It has 72 i/o pins. So there's buckets of i/o.
With 4 encoders, I'm using 3 of them on the Sheldon, One for the
spindle, and two replace the cranks on the apron that allow me to drive
it by hand. The dis is the cost as it needs 3 7i44TA's to guard its
gpio pins from over 3.5 volts of logic. The config I'm using has 4
encoders stock. It can be used with a parport breakout, or with a 3 wire
spi interface at quite blazing data speeds (42 megabaud writes, 25
Megabaud reads) with an rpi4b clone doing the work.
Had I built my 1940's Sheldon 11x54 first, I would never have used
anything else in my other 3 cnc'd machines. The other 3 were done first,
are run by big old Dells, with a 5i25 in the Dell and a 7i76D plus a
parport breakout, usually with the opto-isolators bypassed for speed.
That 5i25 encoder is watching a 1000 ppr encoder on the rear of the 1hp
motor on my GO704, rated for 1800 rpm but has not dropped a bit ever
once the opto's in the parport were bypassed. That 90 volt motor with my
124 volt psu can do 21,000 rpms wide open. I'm amazed I haven't blown
the nylon gears in the heads gear-shift. I've been abusing it that way
since 2009. And still on the same factory brushes. I have i/o enough
left on that Sheldon build to run an Emco tool changer if I ever find
one I can afford.
Yeah, that seems like another option.
El mar, 3 dic 2024 a las 22:52, andy pugh (<bodge...@gmail.com>) escribió:
On Tue, 3 Dec 2024 at 15:32, Leonardo Marsaglia <ldmarsag...@gmail.com>
wrote:
The main concern to decide my configuration is: Is there a 7i53 like
board
that uses the SERIAL I/O interface instead of the 50 pin connector?
7i89?
Not as many encoders, because there are not as many pins...[...]
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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