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Offline Robhi

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need an advice
« on: January 02, 2011, 11:19:06 AM »
hello...

happy new year....

i have a cnc machine with stepper motor, gecko drives and campbell breakout board, i would like to change stepper motors into servo ones, i do not really know which kind of motor i have to buy, AC or DC ones? will my breakout board will work with? and my drives gecko?  i guess they are G230  thanks in advance for your help

Offline Hood

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Re: need an advice
« Reply #1 on: January 02, 2011, 11:34:03 AM »
You can use the same breakout but you will need different drives. AC or DC is up to you, DC is much cheaper and most of the normal drive makers such as Gecko have drives for DC.

Hood

Offline Robhi

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Re: need an advice
« Reply #2 on: January 02, 2011, 11:47:16 AM »
OK thanks hood...

i would like to use G340...
could you give me a web site where i could order servo motors that can work with G340 drives, DC servo motors please?

Offline Hood

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Re: need an advice
« Reply #3 on: January 02, 2011, 11:57:00 AM »
I am from the UK  and not sure where you are from but if you are USA or North America then possibly www.kelinginc.net would be a good place to start.

Hood

Offline Robhi

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Re: need an advice
« Reply #4 on: January 02, 2011, 11:58:51 AM »
am from switzerland

Robhi

Offline Hood

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Re: need an advice
« Reply #5 on: January 02, 2011, 11:59:14 AM »
Oh one thing to bear in mind is Keling and often others state the peak torque most prominently, so make sure you look at the continuous and size by that value.
Hood

Offline Hood

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Re: need an advice
« Reply #6 on: January 02, 2011, 12:02:07 PM »
Not really sure of any place you could get them in Europe, maybe try searching for DC servo online shop in Google

Hood

Offline Robhi

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Re: need an advice
« Reply #7 on: January 02, 2011, 12:09:15 PM »
Oh one thing to bear in mind is Keling and often others state the peak torque most prominently, so make sure you look at the continuous and size by that value.
Hood
could you explain me please, peak torque  and size by value? thankx hood
Robhi

Offline Hood

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Re: need an advice
« Reply #8 on: January 02, 2011, 12:44:23 PM »
Just remembered about the Whale and Dugong drives from Hungary, they get a very good name and they also sell servo motors.
http://www.shop.cncdrive.com/

Servo motors have ratings for torque they can produce, it is often quoted in two values, one is continuous and the other is peak. The continuous torque value means the motor can produce this torque 100% of the time but the Peak is also available for short periods. The Peak torque is often 3 to 4 times the continuous torque so if you for example try and compare a stepper and a servo and use the Peak rating then you may find that you dont actually have enough torque for the machine. So if you know the torque of your steppers then get servos with approx the same rating for continuous torque and you should be ok.
Hood

Offline Robhi

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Re: need an advice
« Reply #9 on: January 02, 2011, 12:53:48 PM »
OK thanks Hood,
but am sorry if I bother you with my questions, they are servo motors with encoders and someones without encoders, what is the difference between them? and what should i buy?
Robhi