On 9/29/26 15:56, maurice e heskett wrote:
On 9/28/26 08:40, Marcus Bowman via Emc-users wrote:
What closed loop steppers are you using on your Sheldon? Marcus On 28
Sep 2026, at 11:56,
Thanks for asking.
[snip big wall of text]
Both motors on the sheldon are 3 phase nema-23's, driven by a 3 phase
driver with toauto stickers on them. X is a 2nm, timing belted 2/1,
hidden behind a replacement1/2" thick panel that replaces the whole
apron. The Z motor is a 3nm version sitting so it is belted to the Z
screw by about a 1.5/1 ratio. That was my first such setup. Those
drivers are only rated for 50 volts so the supplies are 42 volt.
A couple years later, Hanpose in China made 2 phase versions and sells
them thru aliexpress. But they used higher voltage coil driver
transistors in the 100 volt and up range, so I put the shorter 1nm
nema-23's in my 6040 gantry that I threw away all the electronics of
and made my own, swapping the Z which couldn't lift the spindle at
10ips, same physical size but 1nm rated can toss the 4 bearing spindle
motor up at 150+ ips. Needing a rotary B axis on that machine I
cobbled up a 5/1 right angle and a 3nm 2 phase closed loop. Motor
gets pretty warm but with 72 volts, it can make 600+ revs. I carve
BIG hard maple screws. No heat if the revs are slowed a bit.
Then I needed a rotary A axis on my G0704, so I made another copy of
that & printed mounts to put it on the end of the 704 table, again
with 72 volts on the driver.
I have motors, drivers, and PSU's to do some more motor swapping, but
my kidneys have made me spend time (3 hours a session) in a dialysis
chair 3x a week. I'll be 92 next week, so I'm not as fast as before. I
am also a certified electronics technician.
One thing I failed to note is the step/dir inputs on the Hanpose driver
are a special high speed opto-isolator. As such and using a good
controller board in a printer, the opto has a current limit of 15
milliamps. standard controllers use a 5 volt swing, enough to eventually
blow that opto. So when using the Hanpose drivers, put a 150 ohm, 1/4
watt resistor in series with each of those 2 pins. Otherwise the Hanpose
product is bullet-proof.
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