Re: [CAD_CAM_EDM_DRO] Re: Servo controllers for table top machines.

You and Mariss are both right about stepper over servos on the Techno Esel
router. That said, Techno has sold quite a few of the servo systems that
were a direct drive to a 5mm pitch ballscrew. They used a couple different
servo motors. For the XY axis they used C23 servo motors rated at about 400
oz in peak as I recall. The Z axis motor had a bit more torque and had a
brake mounted on it. None-the -less there are many happy techno owners that
love those machines
Dan Mauch
low cost stepper and servo motors.
cases for Gecko drives
kits and assembled 3-4 axis drives
www.camtronics-cnc.com
www.seanet.com/~dmauch

----- Original Message -----
From: "Leslie Newell" <lesnewell@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, December 17, 2006 1:22 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Servo controllers for table top machines.


> As Mariss mentions, servo motors like to turn faster than steppers.
> Ideally you want belt reduction. The other alternative is to use a motor
> with enough torque to directly drive the screw. This is often done on
> industrial machines. Your machine will probably end up capable of silly
> rapid speeds but you don't have to use all of the available speed.
>
> A smaller motor will of course be cheaper then a big motor. However when
> when you figure in the cost of the belts/pulleys and labour you will
> probably find that overall a bigger motor will be cheaper.
>
> Les
>
> enytned1 wrote:
>> "It trades speed you can't use for torque you can." What??????
>>
>> I was under the impression I could just bolt on the brush type servo
>> motors directly to the ball screw end, similar to the way my stepper
>> motors are connected currently.
>> How do DC-servo motors with 500CPR encoders with Gecko 320drives
>> compare to a micro stepping motor and driver in terms of
>> repeatability, precision etc?
>>
>> The old techno controller I use was originally setup for full step
>> mode I have changed this to half step mode and have seen an immediate
>> improvement. How reliable are these controllers you mentioned? I
>> know I can get a 4-axis upgrade from Techno for about $3500.00 but I'm
>> not sure if I can convert it to run of Mach3?
>>
>
>
>
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