[TheForge] Re: Ralph, Mike and their toys (Was: OT Threads ?)

[Grover Richardson]

Hall effect switch monitoring engine rpm.  Run it to an op-amp with an
integrator.  Run the output of the op-amp to a transistor which will apply
current to a solenoid in a linear manner.  Easy design, but the tweaking
after installation would take some time.  

>*>-----Original Message-----
>*>From: theforge-bounces at mailman.qth.net 
>*>[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Bob 
>*>Ehrenberger
>*>Sent: Thursday, February 16, 2006 12:28 PM
>*>To: Darrell; Sponsored by ABANA
>*>Subject: [TheForge] Re: Ralph, Mike and their toys (Was: OT 
>*>Threads ?)
>*>
>*>
>*>Maybe it's a termonaligy thing.  How about cruse control 
>*>then.  You used to be able to get an after market cruse 
>*>where you would glue a magnet to your drive shaft and mount 
>*>a pick up near by. There were electronics that mounted in 
>*>the cab and a servo that went on the throttle. The operator 
>*>could get the engine up to the speed he wanted and hit the 
>*>cruse button, after that when the load would bogg it down 
>*>the cruse would kick in and goose the engine.
>*>
>*>Another option would be a two position foot switch like on a 
>*>spot welder where position one closes the contacts and 
>*>position two hits the current. On the hammer the first 
>*>position could throttle up the engine and position two could 
>*>engage the hammer.
>*>
>*>Robert Ehrenberger
>*>Shelbyville, Mo.
>*>eforge at centurytel.net
>*>
>*>
>*>----- Original Message ----- 
>*>From: "Darrell" <darrell67 at machinemaster.com>
>*>To: "Bob Ehrenberger" <eforge at centurytel.net>; "Sponsored by 
>*>ABANA" <theforge at mailman.qth.net>
>*>Sent: Wednesday, February 15, 2006 7:23 PM
>*>Subject: Re: [TheForge] Ralph, Mike and their toys (Was: OT 
>*>Threads ?)
>*>
>*>
>*>Those kind of truck governors work the wrong way for what is 
>*>needed. They limit the max RPM. What he needs is one that 
>*>limits the minimum RPM
>*>
>*>Darrell
>*>
>*>----- Original Message ----- 
>*>From: "Bob Ehrenberger" <eforge at centurytel.net>
>*>To: "theforge" <theforge at mailman.qth.net>
>*>Sent: Wednesday, February 15, 2006 8:34 PM
>*>Subject: RE: [TheForge] Ralph, Mike and their toys (Was: OT 
>*>Threads ?)
>*>
>*>
>*>> I replaced the govener on our Fergason tractor many years 
>*>ago.  It was 
>*>> a couple of cones with ball bearings between them.  The faster it 
>*>> turned the more preasure the bearings had against the 
>*>cones forcing 
>*>> them to separate. As they separated they would put 
>*>preasure against 
>*>> the throttle. This
>*>design
>*>> would be hard to retrofit to another engine, just thought 
>*>I'd throw it 
>*>> out there.
>*>>
>*>> The  typical small engine govenor is a sail paddle that 
>*>picks up the 
>*>> air
>*>off
>*>> of the fins on the fly wheel. The sail is balanced with 
>*>springs to the
>*>back
>*>> of the throttle. The faster the engine turns the more preasure the 
>*>> sail exerts against the throttle.  You might be able to 
>*>rig something 
>*>> off the cooling fan if it is direct drive.  If your truck has an 
>*>> electric cooling fan you would need to rig up a fan, baybe 
>*>in place of 
>*>> the A/C pump or the P/S pump neither of which would be of 
>*>much use on 
>*>> a stationary engine.
>*>>
>*>>
>*>> Another idea, rental trucks usually have govoners.  You 
>*>might be able 
>*>> to
>*>get
>*>> a look at one of those at a local rental place.  Maybe find an old 
>*>> U-Haul/Ryder in the junk yard and get it's govenor.
>*>>
>*>> Robert Ehrenberger
>*>> Shelbyville, Mo.
>*>> eforge at centurytel.net
>*>>
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