Re: [CAD_CAM_EDM_DRO] Are Geckos and Rutex good enough

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@...>
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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