Dual bipod winch foam cutter

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08 Jul 2011 02:19 - 08 Jul 2011 03:01 #11240 by bvandiepenbos
Hello,
I have built a winch type foam cutter and having EMC configuration problems.
I used the "hotwinch" files from the german fellow here...
code.google.com/p/emc2hotwinch/w/list
I can jog each of the 4 winch motors independently but gcode X Y moves don't move all in snyc to make moves.

I am pretty sure the .hal and .ini files are edited correctly for my pinout.
I think I have kinematics file in the right place.

Any ideas what is wrong?

~*Brian

kinematics file is in /usr/realtime-2.6.32-122-rtai/modules/emc2/dualbipod.ko

here is the guys website www.cnc-hotwire.de/
Last edit: 08 Jul 2011 03:01 by bvandiepenbos.

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08 Jul 2011 02:38 #11241 by bvandiepenbos
my hotwinch.ini file

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File Name: hotwinch.ini
File Size:5 KB
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08 Jul 2011 02:40 #11242 by bvandiepenbos
my hotwinch.hal file

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File Name: hotwinch.hal
File Size:5 KB
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08 Jul 2011 02:41 #11243 by bvandiepenbos
another .hal file that is used

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File Name: p_left.hal
File Size:1 KB
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08 Jul 2011 07:44 #11246 by cncbasher
could be a number of things , which no doubt you have checked , ... missing steps is the obvious ,
is your power supply capable of supplying all the current needed for 4 steppers at the same time , and is your stepper motor wireing heavy enough , are all the steppers tuned and configured the same .

can you explain more in detail as to what results you are achieving .

i would look more at a hardware problem or stepper tuning

can you give more information on your hardware setup
and we can see if we can pin it down

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08 Jul 2011 12:06 #11257 by andypugh
bvandiepenbos wrote:

I can jog each of the 4 winch motors independently but gcode X Y moves don't move all in snyc to make moves.


I am not sure if you have to manually switch to WORLD mode coordinated moves. (Press $, or in the Machine menu, I think)

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10 Jul 2011 02:58 #11346 by bvandiepenbos
Yes! switching to world mode with $ worked. thanks for the tip Andy.
now I can mdi move all...
"right" side bipod is X & Y
"left" side bipod is U & V
Guess that means my g-code will be special...
command X & U together and Y & V together.?

now I need to get steppers tuned, how is best way to do that?
the current settings don't move motors smoothly or nearly fast enough.

motor specs say to use around 1000 pps
so what values should I use for time, space, hold and setup?

4 wire bipolar motors, .8amp/phase

Driver board is a 4axis TB6560 from China (yuk... I am sorry I bought it, docs are crap)
Board can microstep 1, 1/2, 1/8, 1/16 what should I use?

1 revolution of the winch is 1.0" of cable

power supply is 24volts 15amps



Thank you.
~*Brian

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10 Jul 2011 10:44 #11353 by andypugh
bvandiepenbos wrote:

now I need to get steppers tuned

motor specs say to use around 1000 pps
so what values should I use for time, space, hold and setup?


Steppers don't normally need tuning, they ought to just work.

You can't really get step timing information from the pulse rate, that is governed by the driver not the motor.
However, you can say that 1000pps and 200ppr = 5rps, = 3000rpm = 3000 in/min
That seems very fast indeed for a 0.8A motor. In fact I don't know of any machines that move that fast, even with servos. I suspect that you probably have the axis velocity set much higher than the motors can manage, 1000pps is probably the speed at which the motor torque is effectively zero.
You have a 15A supply and 4 channels of 2.5A drive, so at least it would be easy to upsize the motors if they prove inadequate.

Driver board is a 4axis TB6560 from China (yuk... I am sorry I bought it, docs are crap)

The best docs are from Toshiba for the driver itself.
www.semicon.toshiba.co.jp/docs/datasheet...datasheet_110118.pdf

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10 Jul 2011 16:25 #11356 by bvandiepenbos
andypugh wrote:

bvandiepenbos wrote:

now I need to get steppers tuned

motor specs say to use around 1000 pps
so what values should I use for time, space, hold and setup?


Steppers don't normally need tuning, they ought to just work.

You can't really get step timing information from the pulse rate, that is governed by the driver not the motor.
However, you can say that 1000pps and 200ppr = 5rps, = 3000rpm = 3000 in/min

sorry, but ya lost me here?

~*Brian

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10 Jul 2011 17:18 - 10 Jul 2011 17:19 #11358 by andypugh
1000 pulses per second / 200 pulses per rev = 5 revolutions per second = 300 revolutions per minute = 300 inches per minute.

(It seems I lost myself too)
Last edit: 10 Jul 2011 17:19 by andypugh.

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