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

I recently helped a couple Teckno Esel owners with their machines. The
reason for the bnrake on the Z axis was the 3hp router combined with a
ballscrew. With loss of power to the servo motor the Z axis would back spin
and crash into the table. They solved that problem by using an air cylinder
with an air accumulator to equal the load of the router on the Z axis.
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: Monday, December 18, 2006 11:03 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Servo controllers for table top
machines.long


> >
>> If you check the subject line, it is for table top machnes. Les
>> either has a really large table or he too missed the size the OP is
>> talking about.
>>
>
> Perhaps I over emphasized the 'crashing into the endstops' bit but even
> a small machine like this is quite likely to suffer from the Z axis
> winding down under it's own weight when power is removed, especially
> with a direct drive servo. This is presumably why Techno fitted a brake.
>
> I admit I do run some big machines. One of my lathes is a 3.5 tonne
> monster that will flatten most tables ;-) However I also have a Denford
> Orac which is a larger table top machine. I also have a Denford Triac
> benchtop mill. A while back I retrofitted an Emco Compact5 CNC lathe for
> a local woodworker. He kept complaining about how slow it was. In the
> end I replaced the steppers with servos. It now flies, turning out chess
> pieces and flute parts.
>
> Les
>
>
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