Subject: Re: Champion Blower Repair

From: Tom Alexander <[email-masked]>
Date: Tue, 25 Jun 1996 18:42:05 -0400 (EDT)

At 06:17 PM 6/24/96 -0500, you wrote:
>I recently picked up a 400 series Champion blower that is in generally good
>condition except that one of the gears is missing some teeth.  It is the
>small gear that runs off the crank gear next to the large bronze gear.  I
>took it to two machinists and the teeth are nothing not like any modern gear
>so they can neither repair it or suggest a replacement.  Does anyone know
>where you can get gears like this repaired or find replacement parts.
>Better yet does anyone out there have this gear off an old blower and wish
>to sell it?  Worst case,  can anyone suggest how I can repair the gear tooth
>say by trying to build it up with a welder and form the tooth by hand?  
>     Those are my ideas but I am sure someone out there has a better one and
>more experience with this.  Chris Hubbard, Dekalb, IL
>
>
  I've never done it myself but understand that replacing gear teeth is
pretty standard business, at least for spur gears. I gather that it's best
to  mill away a pretty deep slot where the tooth was, then silver solder in
a blank piece of metal and file it to the tooth profile. Others simply drill
and insert a couple of reinforcing pins then fit the blank to that and file
as before. It's not as critical as it may sound; the main thing is to keep
it from busting again.
Regards,

Tom Alexander <[email-masked]>

{dx 1/93 at age 62, PSA 5.9, Gleason 5, T1C. WW since. On 5/93 PSA 10.2,
second biopsy (15 needles, different pathologist) Gleason 3+3, est. tumor
volume .5-1.5cc. On 6/94, third biopsy, no sig. change. On 3/96 PSA 6.8.
Taking saw palmetto)

---

From: "daryl (d.a.) bender" <[email-masked]>
Date: Tue, 25 Jun 1996 17:56:00 -0400 [/PRMD=BNR/ADMD=TELECOM.CANADA/C=CA/;bcars520.b.890:25.05.96.21.57.01]

Hi Chris

As someone who is into gearing the statement "the teeth are nothing not 
like any modern gear" intrigues me. What is it that makes you say that? 
Are they not involute teeth, are they a funny pressure angle (not 14.5 
or 20deg)? These are about the only things (apart from cost) that should 
stop a machinist. I forget if these are helical but even that is 
machinable.
If they are not helical and given that the speed is slow you could weld 
up a raw tooth and file and shape it but *I* would likely look for 
another blower assuming you don't have a mill and index head and 
involute cutter of the right size.
Oh BTW as someone who has just replaced a set of helicals this very week 
if you could give me the particulars I might be able to see if there is 
an off the shelf replacement.

They must be involutes so...
If they are helical let me know that first as that may make off the 
shelf replacement difficult (depends on angle);

What angle do the teeth make with the side as viewed from above?
If they are straight spur gears ignor the first question.

# of teeth =

EXACT tooth to tooth distance (say at tips) =

Height of tooth =

Max diameter of gear = 
(the above three would help me in determining diametral pitch) 

Face width =

Arbor size =

Pressure angle =
(The last one may be difficult and is most likely 14.5deg (older std)
it is the angle of side of (a rack) tooth with the vertical.

Wait a minute.... is this that silly worm drive thing. If so let me know 
that and in addition to the above;

# of starts on the worm =

Diameter of worm =

Cheers
Daryl

In message " Champion Blower Repair", [email-masked] writes:

>I recently picked up a 400 series Champion blower that is in generally
>good condition except that one of the gears is missing some teeth.  It 
snip....