[SEL] Sorta O/T..gear making

[Richard Strobel]

Thanks for the link, Jim..."Chordal Addendum" is a new one for me.  I could 
learn a lot from that chart.  Retention is the prob and I'm a year older 
today.  One more year and I'll draw Guard retirement.  Kathy got me a '69 
Toyota Landcruiser for B'day..got a real nice running 292 Chev engine..looks 
good and ya can see the distributor.  Nice pto winch also...look out 
snow!!!!  Warm and good tunes.

Thanks again!!
Rick


----- Original Message ----- 
From: "Jim and Diane" <jd.kirkes at verizon.net>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Wednesday, January 26, 2005 8:04 PM
Subject: Re: [SEL] Sorta O/T..gear making


> It seems unlikely to me that early engine people devised a unique gear
> geometry.  This would have been a pretty demanding and expensive 
> undertaking
> and there would have been little if any advantage over what was already
> invented. Almost surely these gears had a 14 1/2 degree pressure angle and
> used an involute curve for the tooth form. There are other PA's in use 
> today
> and unless you are a real gear pro it almost impossible to eyeball 
> different
> pressure angles. There are also other tooth geometries besides involute, 
> the
> drawback is their shape makes them difficult to machine with no gain in
> performance or life.
>
> For gear terms see http://shopswarf.orcon.net.nz/spur.html
>
> Jim
>
> Jim and Diane Kirkes
> Hemet, CA
> jd.kirkes at verizon.net
> ----- Original Message ----- 
> From: "Tommy Turner" <lcjudge at scrtc.com>
> To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
> Sent: Wednesday, January 26, 2005 6:16 PM
> Subject: Re: [SEL] Sorta O/T..gear making
>
>
> > JB,
> >
> >     I've done the same thing several times with good results.  I've
> > found it best to purchase  the crank gear and the cam gear and replace
> > them both.  Some of the old timers had an odd ball pitch on their
> > teeth.  I had a friend who needed a gear made and the guy who cut it for
> > him had to have a special cutter ground to match the other gear.  Some
> > of the real early manufacturers may have ground their own cutters and as
> > a result, it was their own "design".
> >
> > Tommy Turner
> > Magnolia, KY
> >
> >
> >
> > jbcast at charter.net wrote:
> >
> > >>What is the best route to take to get gear(s) made?  One is a
> combination
> > >>i.e. two gears, one casting.  I also need a smaller gear...all 
> > >>straight
> cut
> > >>teeth.  This is for manually traversing the carriage on my ole lathe.
> Could
> > >>the old ones be used for a pattern and is this something Rick Rowlands
> could
> > >>do?
> > >>
> > >>
> > >>
> > >Rick, get a Boston Gear or Rush Gear catalog, see if the gears are
> available, width may be a little different, the center is adaptable also. 
> On
> my lathe I machined the hub and made a ring gear out of the new gear, 
> heated
> and shrunk it on and pinned it. On the double gear, if only one is bad, 
> bore
> it out amd press it on a shaft, bore the new gear and press it next to it.
> > >J.B. Castagnos
> > >Belle Rose, LA
> > >
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> > >
> > >
> > >
> > >
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>
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