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John T a Bendix ?

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Tx Jim

10-14-2007 03:57:50




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John T in another thread about a 1020 starter bendix you stated about a magnetic plunger/solenoid or bendix type. Would you please enlighten me as to the correct terminology. I've always called a starter drive gear a bendix so I was wondering. BTW the 1020 has what I would call a magnetic plunger/solenoid so is the starter gear not called a bendix? Thanks for setting me straight on terminology,Tx Jim

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Tx Jim

10-14-2007 13:10:07




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 Re: John T a Bendix ? in reply to Jerry Pevehouse, 10-14-2007 03:57:50  
Ok so this ts sorta like facial tissue is called Kleenex,Window cleaner is called Windex and toliet paper is called Charmin or John Wayne. Correct????? ??? Tx Jim



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John T PS

10-14-2007 07:19:57




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 Re: John T a Bendix ? in reply to Tx Jim, 10-14-2007 03:57:50  
I figure the drive gear teeth and the one way clutch drive (so they free wheel if flywheel starts turnin fast) are alllll lllll lllll properly called STARTER DRIVE GEARS and the Bendix Corp probably makes all sorts of them, so its just what engages them (electricity or centrifugal or pedal type mechanical force) thats at issue here Ima thinkin.....

John T



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John T

10-14-2007 07:02:54




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 Re: John T a Bendix ? in reply to Tx Jim, 10-14-2007 03:57:50  
Hey Jim, I'm not the best guy to help explain this mechanical terminology very well but I will give ya my best shot. On those starters that have their drive gear that engages cuz centrifugal force thrusts them outwards (toward shafts end) against a slight return spring force and theres NO electricity involved whatsoever to engage them, I generically call them a BENDIX. I think thats just a brand name if you wanna get detailed.

HOWEVER if the drive gear is thrust out due to some sort of electromagnetic action like where electromagnetic force in a can type electrical operated solenoid engages the drive gear, I dont think of then as a Bendix.....

That being said, I think Im right and a lot of people may think similar, but thats still no pure cut definition I admit. I was trying to distinguish from the pure mechanical centrifugal drive gears (I call bendix) versus thos startes that have a can type solenoid where an electromagnet is what pushes/levers the drive gear in place. NOTE on the old saddle type mechanical start switches like sooooo oo manyyyyy y Deeres used its the operators stepping on a pedal that actually pushes the drive gear out BEFORE the switch engages, but I dont think of that as a Bendix either cuz its NOT the centrifugal force thats at work.....

Help me out here guys, can anyone really tell us whats a Bendix n whats NOT, I think its one of those deals where the brand name (Bendix makes them) has become like the generic label such as band aid and kleenex etc etc

John T

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Bob

10-14-2007 09:11:02




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 Re: John T a Bendix ? in reply to John T, 10-14-2007 07:02:54  
If we are going to be "nitpicking" here, the "screw itself out" drives are INERTIAL starter drives, as it's INERTIA that makes them screw out and engage, rather than centrifugal force.

However, on the "positve locking' starter drives, little spring-loaded pins catch against a ledge, and the drive stays engaged 'till the little pins are pulled outward by centrifugal force when the engine "catches" and the starter "revs up", releasing the drive so it can "kick out".

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John T

10-14-2007 11:30:14




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 Re: John T a Bendix ? in reply to Bob, 10-14-2007 09:11:02  
Action Reaction, thats the 3rd law I 4 got

John T



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John T

10-14-2007 10:42:25




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 Re: John T a Bendix ? in reply to Bob, 10-14-2007 09:11:02  
Well spoken Bob and your absolutely correct, has to do with Newtons 3 laws or something like that (F= MA, Inertia, and I forget the third) where bodies at rest tend to stay at rest unless acted on by an external force and likwise, bodies in motion tend to stay in motion until acted on such as friction etc. That starter drive has mass n it dont like to start turnin as fast as when the armature rapidly spins, so its resistance to change from rest is what causes the faster turning armature splines to thrust it outward wooooo ooo hooooo o

I barely passed thru Statics n Dynamics n all the Mechanical n Thermo stuff and thats been almost 40 years agooooo ooo

take care, fun techy discussion,

John T

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Farmer Jack

10-16-2007 15:16:08




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 Re: John T a Bendix ? in reply to John T, 10-14-2007 10:42:25  
John,

Don't forget entropy. It's the reason we can't get up some days...



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