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Author Topic: Gecko 320x  (Read 11670 times)

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Offline Robhi

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Re: Gecko 320x
« Reply #10 on: May 09, 2013, 11:40:16 AM »
OK.. I will try  all what You have said... hoping it will be OK.. Let you know of course.


thanks for all you
Robhi

Offline Robhi

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Re: Gecko 320x
« Reply #11 on: May 09, 2013, 05:31:56 PM »
Hi,

When I ordered the kit servo motor from keling, they sent 4 encoder, I guess old ones, one of the was damaged one the to me, then they sent me a CUIs encoder to replace it.

I tried it now and nearly every thing is OK, it works very well. and there no red led fault.

So many thanks for all of you.

But there is another thing, normally, with a powere supply of 70 volt, gecko 320x, KL 34, 180-72, of 4000 tpm, I should have a little bit speed. but I guess my motor is no too fast. current limit is set at 9h30 o'clock (lol). How could I have more speed if it is possible?

thanks again

Robhi :)

Offline Hood

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Re: Gecko 320x
« Reply #12 on: May 09, 2013, 06:08:16 PM »
It could be a few things, but this is most likely, with a servo there will be a rated RPM and also a rated voltage. The rated RPM can only be achieved if you supply the rated voltage.
So say it is 4000 rpm and 100v, but you only have 50v max then the max rpm you can expect from the motor will be approx 2000rpm.
Hood

Offline Robhi

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Re: Gecko 320x
« Reply #13 on: May 10, 2013, 01:20:08 PM »
OK thanks Hood,

so when I have chosen the pulley of 20 teeth mounted on the motor and the other of 60 teeth mounted on the screw of 10mm pitch, it is a bad choice, I guess.
my machine is about 2500mm DE long, for wood, so it will be very slow. could I have an advice, if I use 30 teeth pulley mounted on the screw to have more speed?
what do you think?

thanks
Robhi

Offline Hood

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Re: Gecko 320x
« Reply #14 on: May 10, 2013, 01:35:00 PM »
Its hard to say whether you can gear less as I dont really know whether you need the torque that the gearing will give or whether you can get away with less.

Regarding the motors etc,
how many lines do the encoders have, possibly 500?
What pitch screws do you have?
What is the voltage of the supply you have?
What kernel are you using in Mach?
Hood

Offline Robhi

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Re: Gecko 320x
« Reply #15 on: May 10, 2013, 02:09:45 PM »
hi,
Encoder 500 lines
pitch  screw 10 mm
power supply  70 volt
kernel of mach3 35 000 k
thanks Hood
Robhi

Offline Hood

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Re: Gecko 320x
« Reply #16 on: May 10, 2013, 02:40:40 PM »
Ok just looked at the specs of your motors and the voltage constant is 18.95v/100rpm, I however think that may be a mistake.
Two reasons I am thinking that, first is normally the voltage constant of a servo is expressed as v/1000rpm and second it is giving a figure of 4000rpm at voltage constant, so if the 18.95/100rpm was correct then that would mean you would have to apply 758v to get that.

So we will take it that the  specs are wrong and assuming you have a 70v power supply you should get in the region of 3,600rpm for your motors. With a gearing of 3:1 as you have then your rapid speed should be 12,200mm/min. (3600rpm/3 x 10)
However to achieve that rapid you would require a kernel of 2000 (500 x 4 encoder) x 3,600/60 =  120,000Hz or 120KHz
The max possible kernel in Mach is 100KHz but you will need a very fast and stable computer for that, more likely will be 45 to 65KHz.


So to summarise, to get the best out of your machine with that gearing you really need to use an external controller such as the SmoothStepper or CSMIO/IP-M etc as they will allow you to get the pulse rate you require.

Doing away with the gearing may allow you to get reasonable rapids from the parallel port, that will just depend on how much velocity you require and also what torque your machine requires.

Hood

Offline Robhi

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Re: Gecko 320x
« Reply #17 on: May 10, 2013, 03:55:24 PM »
OK Hood, thank you so mach. But i guess it is so expensive to buy other materials, I will try to of what have.

thanks so much
Robhi

Offline Hood

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Re: Gecko 320x
« Reply #18 on: May 10, 2013, 04:45:20 PM »
What velocity are you thinking you will need?
Hood

Offline Robhi

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Re: Gecko 320x
« Reply #19 on: May 11, 2013, 11:57:10 AM »
I am thinking to have about 30 seconds to achieve 2500mm.. but I guess I will never have it

Thanks
Robhi