Re: Are Geckos and Rutex good enough

That was VERY illustrative, and I thank you very much for the info.
Out of curiosity, what is your current project?
Best Regards
Fernando Mayrl


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "gazelle" <gazelle@o...>
wrote:

> Rutex drives such as the 90H are capable of up to 200V 40 amps

which for a

> DC servo is over 10 HP input.
> Now 1 HP can lift 33000 lbs 1 ft in 1 minute. roughly 15 tons.

Times 10 is

> 150 tons lift in 1 minute.
> So if the z axis weighed one ton all up and was 100% efficient the

table

> would move at 150 ft per minute. Say that motor and frictional

losses may

> consume 3/4 of the power. That leaves roughly 40 ft per minute

for long

> rapids. This would be worst case. Bear in mind it has to

accelerate which

> means the axis becomes heavier based on F=MA. So you can see,

there is

> plenty of grunt even for heavy duty machines.
> By the way, the gecko would have about 1/5 of that performance.

80 V 20 A

> .
> As there is power enough lets examine revs. With a leadscrew

of .2" lead we

> need 60 RPM to move 1 FT per minute. If the motor were direct

drive then

> 40 X 60 RPM would be required to cause an axis rate of 40 feet

per minute.

> This is well within the speed range of typical servos.
> Now what about the step rate from the driving software into the

drives. 40

> feet per minute at say a scale granularity of .0001" means( 40 x

12 x

> 10000)/60
> is 80 KC. This is about twice the speed that Mach2 can squirt. So

the

> limiting speed would then be 20 feet per minute or 240 " per min.
> So you can see that theres loads of servo performance using these

drives and

> thats exactly what my present project is all about.
>
> ----- Original Message -----
> From: "Fernando" <fer_mayrl@h...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Tuesday, February 03, 2004 3:01 AM
> Subject: [CAD_CAM_EDM_DRO] Are Geckos and Rutex good enough
>
>
> > Hello:
> > I was wondering, are gecko and rutex servo drivers good enough

for a

> > production heavy duty machine? How fast, in IPM, can these

drivers

> > go max, with big enough motors, and 5 TPI lead screws?
> >
> > Thanx in advance
> >
> > Fernando Mayrl
> >
> >
> >
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