Messages

1

General Mach Discussion / Re: motor madness

« on: October 08, 2009, 08:22:17 AM »

well, just got done wiring up for parallel, and not that gibberish wiring from my last post (musta been tired or sumthin )

Got plenty of torque and speed, and still 0.5A amps in reserve for each phase. I might have overdiminsioned the motors just a weeee bit for the purpose


Thx all for the help, time to get the gantry finished. DeadDave Lives!

2

General Mach Discussion / Re: motor madness

« on: October 07, 2009, 01:59:09 PM »

Hood, you are a certified genious!

I tried the sherline setting, and every problem just magically went away, the motors are purring like very weird kittens, and on all 4 axis too 
I shall manufacture a wooden kilt in your honour, once i get the machine built

Stirling, about the wiring, from everything else i've read you are right about performance. The wiring i had intended to use is bipolar parallel, but since i was just trying to get a working baseline i went with the serial wiring suggested by the seller. I dont have any datasheet on the motors but now that i know they work with that wiring, i'll have to assume the colors are right.

in that case it should be:
A: blu-blu/wht
B: red-red/wht
C: grn-grn/wht
D: blk-blk/wht
as you suggest.

The translation may indeed be lacking, german is not by any means a language i'm confident in. However with the board layout and the L297/L298N combo and a generous psu, pulling 2A per phase, 4A per driver should possible. I'll return with results. The board may be rather strange, but its fairly cheap and for reasons unknown the breakoutboard/driver selection avaliable in this end of the world is severly limited, that is, as long as you arent prepared to spend the GNP of Saigon on brand name systems

3

General Mach Discussion / Re: motor madness

« on: October 07, 2009, 06:31:06 AM »

I've tried the pulse width/dir 5us change to no effect. the jog is set to 100%. Havent tried sherline though, i'll give that a go when i get near the machine again. As for the website its in german, a langiuage i am barely comprehending myself. I'll try a translation though  

SM44PCV5.1 driver board:

# Connectoors for 4 stepper motors
# Adjustable automatic current limiting. Current reduction at motor standstill
# Connects to PC parallel port or microcontroller
# Function check via LED's on each channel
# All inputs and outputs are across optocouplers
# signal current min. 3,3V
# pulse frequency max. 45KHz
# max. 46V Motor current
# 2A phase amperage (4A per Motor)
# with integrated fans
# Basismaterial-Epoxyd
# with soldering / stop paint and silkscreen (industrial grade)

   
Connectable limit switches and an active emergency / stop switch.
Four bipolar stepper motor driver (with a center tap unipolar) stepper motors can be controlled.
The circuit is designed for motors with 2A per coil. The max. Operating voltage is 46V.
The current limit is adjusted with a potentiometer for each channel so that the circuit is adaptable to various stepper motors.
Each axis is capable of a power reduction. Reduction is implemented when motors are at a standstill. Waste heat from the motors is greatly reduced. The current reduction is indicated by a LED. Four jumpers allows you to choose between full or half step. All external inputs and PC inputs are electrically isolated by optocouplers. All 4 axis on the control board can be operated directly via a parallel port on a PC or via microcontroller or any other TTL signal generating source. The control inputs can be connected via a 25 pin SUB-D connector to a PC. The motor connections arestable screw terminals with lift principle. Four axis limit switches and an active emergency / stop button can be connected. The status of the connected switch is signaled via LEDs and can be used as either internal or external display.


   
SMN4515V1 power supply:

The power supply board can operate with an input AC voltage of max. 30V AC and max 45V DC. The motor current is 15A, the 5V logic voltage can be loaded with 1A. The output voltages are indicated by LEDs. A large heat sink with an attached fan protects the board against thermal overload. The input voltage is secured with 15A fuse and protected by a surge suppressor against surges.


M5776/2.0/1.9 2 Phase High-Torque steppermotor:

# 2 phases
# Holding torque 1.9 Nm
# 1.8 ° step angle, 200 steps per revolution
# 8 wires, unipolar and bipolar switchable
# Nema 23, length 76mm
# 1 shaft, 6.35 / 1 / 4 "diameter
# Weight 1.0 kg
# Coil Current 2.0 A bipolar serial, parallel 4A
# Coil voltage 4.0 V
# Coil resistance 2.0 OHM
# Coil inductance 6.4 mH

Hope there's something usefull in there  

ps, the board uses an L297/L298N driver.

4

General Mach Discussion / Re: New people welcome !! Come in here and introduce your self!

« on: October 07, 2009, 05:38:48 AM »

Hi,I'm dave from denmark and i'm so new i squeak.

Decided to build a router for mainly woodwork. Decided to build it on the hobby budget too, and didnt that coma back to bite me on the derriere. Looking forward to a, hopefully, long and educative stay  

5

General Mach Discussion / motor madness

« on: October 07, 2009, 05:34:16 AM »

hello friendly mach people

I have recently purchased components for a cnc machine I intend to build and I'm
already running into some real problems, hoping someone might be able to help me.

Components:

GWR Elektronic SM44PCV5.1 driver board
(http://shop.strato.de/epages/61125483.sf/de_DE/?ObjectPath=/Shops/61125483/Products/%22SM44PCV5.1/RK2%22)

GWR Elektronic SMN 4515V1 power supply
(http://shop.strato.de/epages/61125483.sf/de_DE/?ObjectPath=/Shops/61125483/Products/SMN4515V1)

M5776/2.0/1.9 2 Phase High-Torque stepper motor 2,0A
(http://shop.strato.de/epages/61125483.sf/de_DE/?ObjectPath=/Shops/61125483/Products/"M5776/2.0/1.9")

I would much have preferred a geckodrive of some sort for this project but being in the colder end of Europe the shipping and taxes and toll added up to be about the price for a geckodrive 540. I now regret cutting costs in this particular area

Setup 1 is a  2,8Ghz ibm thinkcentre PC with xp SP2 running mach3 and nothing else. On board and off board gfx cards. Mach3 drivertest reports excellent.

Setup 2 is a 1.6Ghz noname (asrock mobo)  PC with xp SP2 running mach3 and nothing else. On board and off board gfx cards. Mach3 drivertest reports excellent.

Setup 3 is a 500Mhz noname (msi mobo) PC with xp SP2 running mach3 and nothing else. Off board gfx card only. Mach3 drivertest reports excellent.

The motors are noname (literally) motors, 8 wires, 2 phase, 2,0A bipolar serial, parallel 4A, coil voltage 4V, coil resistance 2,0 Ohm, coil inductance 6,4mH. 200 steps/rev with 1.9nM holding torque. Wires are red – blue – green – black – red/white – blue/white – green/white – black/white.
Wired as bipolar serial:

blue and red/white connected and isolated
green and black/white connected and isolated
A - blue/white
B – red
C - green/white
D – black

Above motor information supplied by seller.

The SM44PCV5.1 driver board is configured at 1.5A and hooked up to
a 36V supply.

Test procedure:
I start everything up, enter mach3, set up ports and pins for just 1 stepper to test this out. Board has led's to indicate ready status, hitting e-stop on the board registers in mach 3, all is well.

Now come the problems. I've made a small test axis, 300mm in length with a motor attached to one end via a flex coupling. The drive screw is a 12mm, 60 degree thread, 1.75mm pitch. A preloaded nut is attached. Action is smooth and the nut spins easily. The board is set to half-step. Motor tuning is initially set as follows: 200*2/1,75 = 228,57 steps/mm. Velocity 100mm/min. acceleration 4.

This does work, the stepper moves, but nowhere near 100mm/min. Fiddling around with the numbers the very best I have been able to achieve is less than 1 rev/s. Any higher and the stepper loses all control of itself, losing steps (often every step), moving backwards, sounding like a hammer drill... it isn't good. And even at very low speeds where it does work it runs faster in one direction than in the opposite. I tried increasing the kernel speed in desperation and that does actually work, makes it run smoother but not a lot faster. Worked best at 100khz, which I understand from the mach3 setup video tutorial to be way excessive.

Hooking up another stepper, same type as the first, things get even weirder. The settings for the first axis I copy to this new axis. This motor behaves as screwy as the first one, but not in the same manner, jerks are different and what will make the first axis slow but smooth makes the second jerky in 1 direction and not working in the other. I have tested with a few older steppers salvaged from various places, all were 6 wire types. Behaviour persists regardless.

I'm really at my wits end here I just can't figure this out. Doesn't help that I'm rather new at this - almost all I know, I've read, so practical experience is not abundant. If anyone has any insight, any at all, or has maybe worked with this particular board before please help me.