RE: Curtain Motor RPMs

["Keith Doxey" <ukha@xxxxxxx>]

How long is a piece of string?

Depends on the size of the pulley that is driving the cord and how wide
your
windows are.

If you have a 4" diameter pulley then each revolution will move the
cord 1
foot. My 3 foot wide window would be fully open in 1.5 revs. If the motor
does 10RPM then the curtains are either open or closed.

If you have a 1" diameter pulley then 1 rev = 3" travel. Gear
down t  1 rpm
and you get 3" per second etc.

If you have windows 10 feet wide then each curtain has to move 60".
How long
do you want it t  take for a full open/close.

I have some industrial size curtain motors that I "rescued" from
the skip. I
cant use then at the moment unless I want digital curtains (open or closed
but nothing in-between) but on the original 20 foot wide windows they were
fine :-(

Keith

> -----Original Message-----
> From: Mick Furlong [mailto:dorsai@xxxxxxx]
> Sent: 01 July 2001 12:18
> To: UKHA Group
> Subject: [ukha_d] Curtain Motor RPMs
>
>
> Anyone have any idea what sort of RPM curtain motors need to run
> at to get a
> fairly smooth contolled opening speed?
>
> Mick
>
>
>
>
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