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Posted by pdrahn@coinet.com on September 5, 2008, 8:06 pm
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Hi, Ivan.
I think if the gear will not press off the shaft, I would make a
drawing of the shaft, showing length, length of the flat and diameter
of the unworn part of the shaft, then put the shaft in your lathe and
drill out the shaft so the gear falls off. Then find a piece of water
pipe or thick wall steel tubing that will fit completely through the
housing hole. Take the pipe out and drill 3-4 holes somewhere in the
old housing so you can weld the pipe in place. Pull or unscrew the old
Zerk and drill and tap for a new, Zerk. Then make a new shaft to fit
the bushing you just welded in, or turn it before you weld the
bushing. Have a big end to fit the gear and the rest to fit through
the new bushing. Then mill a flat for the old pulley. You may need to
turn another small bushing to fit the old pulley hub.
At any rate, you probably get the picture. Your statement about the
low torque and the obvious number of years the thing ran tells me that
with regular grease, my fix will last your lifetime!
Let us know how you work out the repair.
Paul Drahn
> The drive assembly to my cement mixer has finally given up. =A0Unfortunat=
ely
> neither I or the previous owner ever used the Zerk fitting to lubricate t=
he
> drive. =A0The drive is a 3/4 inch shaft with a 3" gear on one end and an =
18"
> pulley on the other. =A0Am going to have to machine a new shaft and housi=
ng.
> Housing will be welded to the frame, as is the existing housing.
>
> This link is a picture of the shaft-gear assembly.http://i265.photobucket=
.com/albums/ii214/ivanveg/mixergear-shaft2.jpg
>
> This link is a close-up of the gear. =A0It is pressed on. =A0My plan is t=
o press
> out the old shaft, or, bore it out if I have to.http://i265.photobucket.c=
om/albums/ii214/ivanveg/mixergear.jpg
>
> This is a picture of the shaft sitting loosely in the housing. =A0The hou=
sing
> is simply welded to the vertical channel. =A0The larger diameter (rusty a=
rea,
> middle of the photo) sits in a bolt-on cradle (not shown).http://i265.pho=
tobucket.com/albums/ii214/ivanveg/mixeroverview.jpg
>
> My plan is as follows:
> Remove old shaft from gear.
> Make new shaft and mill a flat on one end to lock on pulley.
> Make a suitable housing with 3/4"=B1 bore.
> After completion slide a short sleeve (2"=B1 outside diameter) onto housi=
ng so
> I can mount in cradle.
> Weld entire assembly back into place.
>
> Questions:
> If I can not press out the old shaft, how do I center a 9-tooth gear in t=
he
> lathe. =A0I have both 3 and 4 jaw chucks.
> Don't have a boring bar 6" long. =A0Can this somehow be done from both en=
ds
> and still end up with a concentric bore?
> How do I modify the shaft so that it can take grease? =A0Do I file a
> continuous spiral? =A0Do I do it to the sleeve? =A0New shaft will have a =
new
> Zerk fitting.
>
> Keep in mind the following. =A0Have 13" lathe and a large mill. =A0This i=
s a
> very low rpm assembly and does not require very much torque. =A0Even with=
drum
> full of 200 lbs =B1 of concrete, you can rotate it quite easily by hand. =
=A0Drum
> IS NOT supported by this mechanism. =A0It is simply a drive.
>
> Thanks for any and all advice.
>
> Ivan Vegvary
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> neither I or the previous owner ever used the Zerk fitting to lubricate the
> drive. The drive is a 3/4 inch shaft with a 3" gear on one end and an 18"
> pulley on the other. Am going to have to machine a new shaft and housing.
> Housing will be welded to the frame, as is the existing housing.
>
> This link is a picture of the shaft-gear assembly.
> http://i265.photobucket.com/albums/ii214/ivanveg/mixergear-shaft2.jpg
>
> This link is a close-up of the gear. It is pressed on. My plan is to press
> out the old shaft, or, bore it out if I have to.
> http://i265.photobucket.com/albums/ii214/ivanveg/mixergear.jpg
>
> This is a picture of the shaft sitting loosely in the housing. The housing
> is simply welded to the vertical channel. The larger diameter (rusty area,
> middle of the photo) sits in a bolt-on cradle (not shown).
> http://i265.photobucket.com/albums/ii214/ivanveg/mixeroverview.jpg
>
> My plan is as follows:
> Remove old shaft from gear.
> Make new shaft and mill a flat on one end to lock on pulley.
> Make a suitable housing with 3/4"± bore.
> After completion slide a short sleeve (2"± outside diameter) onto housing so
> I can mount in cradle.
> Weld entire assembly back into place.
>
> Questions:
> If I can not press out the old shaft, how do I center a 9-tooth gear in the
> lathe. I have both 3 and 4 jaw chucks.