centrifugal switches, *very* little online re DIY or "how to make 'em"

dave

unread,

Feb 4, 2010, 12:58:48 PM2/4/10

to

anybody got any spare 1725 RPM centrifugal switches laying around? shaft
size unimportant. thought about making one, but can't find SHID on the
net about it....like zero...

looked at some old patents, most of the older ones involve "flyball
governor" looking devices/not what I had in mind. need a nice simple
design for some device I can whip together in 15 minutes, out of odds 'n
ends.....adjustability would be nice, for varying the RPM 'kick off' speed

alternately, a nice steveco 90-66 potential relay would be nice too
though :-)

ok, guys, have a fun-infested weekend

toolie, back in the swamp

Pete C.

unread,

Feb 4, 2010, 1:44:12 PM2/4/10

to

A recent post on sci.enrg.joining.welding showed a very simple one. You
won't find much online since they are rarely used anymore in favor of
VFDs, PWM drives, and better feedback systems.

Bill McKee

unread,

Feb 4, 2010, 5:11:07 PM2/4/10

to

"Pete C." <aux3....@snet.net> wrote in message
news:4b6b13f5$0$9735$ec3e...@unlimited.usenetmonster.com...

Just look for an old electric motor with a big cap on the outside. Most had
a Centrifugal switch inside.

Jon Elson

unread,

Feb 4, 2010, 7:01:47 PM2/4/10

to

dave wrote:
> anybody got any spare 1725 RPM centrifugal switches laying around? shaft
> size unimportant. thought about making one, but can't find SHID on the
> net about it....like zero...
>
> looked at some old patents, most of the older ones involve "flyball
> governor" looking devices/not what I had in mind. need a nice simple
> design for some device I can whip together in 15 minutes, out of odds 'n
> ends.....adjustability would be nice, for varying the RPM 'kick off' speed
>
> alternately, a nice steveco 90-66 potential relay would be nice too
> though :-)
>

If you are looking for a motor starting switch, there is now the Stearns
"SinPac switch", a little electronic module that does this job from
outside the motor. Or, you could probably borrow one from any defunct
single-phase motor.

For a 15-minute jury-rig, maybe you could do something with a flap
switch that senses the cooling fan in the motor.

Jon

doc

unread,

Feb 5, 2010, 1:20:41 AM2/5/10

to

I've got some SUPR Universal Potential Relays. New.
Don't know if they would work for you.

Some info one the second page:
http://www.supco.com/images/pdfs/Manuals-Instructions/apr5%20-%20supr.pdf

If you think they'll do the job, how about $25.00 ?
Shipping included if yer in the grand old US of A.

DOC

Something about robots...
http://www.robot-one.com

dave

unread,

Feb 5, 2010, 12:25:22 PM2/5/10

to

Pete C. wrote:

> A recent post on sci.enrg.joining.welding showed a very simple one.

link please?

I've been unsucessful finding a post like you describe. there -Was- one
there recently discussing centrifugal GOVERNOR designs...not what I'm
looking for...

thanks though :-/ pete

------------------------------

Bill McKee wrote:
> Just look for an old electric motor with a big cap on the outside.
>Most had a Centrifugal switch inside.

right then, bill, but then I have to 'narrow down the field quite a bit'
and find one for a cap-start 1725 RPM motor, too. sort was hoping
someone here had a few of the sucka's layin' around in their junkpile or
junk drawer :-/ that they might want to SWAP for some of my equally
astonishing high-quality heavy metal items, such as the numerous items
I've listed at this mighty-fine web location
http://machines.50webs.com/alpha/

thanks bill :-/

-------------------------

doc wrote:
> I've got some SUPR Universal Potential Relays. New.

> Don't know if they would work for you...<more/snip>
HUH! now *THOSE* are interesting. I looked briefly at the pdf. let me
look into it a little bit more. I'm currently of the understanding that
a steveco 90-66 is what I need.

are the ones you have NEW or USED? I'm in gainesville north FL. where
are U located? if you'd go to the page (link above, in my reply to bill)
and scroll to the very BOTTOM center, there's a direct e-mail link to me
there. also, to "sweeten" things, any possibility you'd like to SWAP one
them there relays you have for any of the items I've listed (and
illustrated) on the page link above?

*thanks* doc :-)

Pete C.

unread,

Feb 5, 2010, 1:13:30 PM2/5/10

to

dave wrote:
>
> Pete C. wrote:
>
> > A recent post on sci.enrg.joining.welding showed a very simple one.
>
> link please?
>
> I've been unsucessful finding a post like you describe. there -Was- one
> there recently discussing centrifugal GOVERNOR designs...not what I'm
> looking for...
>
> thanks though :-/ pete

"Lee Governor question - P1010005.JPG (0/1)" is the post in question,
and yes, it *is* a switch.

How you wire the contacts determines whether it acts as a governor,
limit switch, "up to speed" switch, etc. Functionally it is nothing more
than a set of contacts that open when an adjustable RPM set point is
reached.