Re: Opinions on this gear contact pattern
[Re: RV2]
#2450891
02/12/18 09:32 PM
02/12/18 09:32 PM
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Joined: Dec 2005
Posts: 11,692 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,692
Fulton County, PA
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It's unusual to see the entire face of the tooth wiped clean like that. I'd want to see one of the other teeth where the marking compound on the pinion was transferred to the ring gear.
If the results don't match the theory, change the theory.
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Re: Opinions on this gear contact pattern
[Re: CMcAllister]
#2451024
02/13/18 12:17 AM
02/13/18 12:17 AM
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Joined: Dec 2004
Posts: 10,558 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,558
Rittman Ohio
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Yeah you usually see that type of pattern with used gears Maybe the Doctor will chime in for an opinion Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Opinions on this gear contact pattern
[Re: RV2]
#2451135
02/13/18 12:01 PM
02/13/18 12:01 PM
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Joined: Nov 2015
Posts: 883 Missouri
jwb123
super stock
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super stock
Joined: Nov 2015
Posts: 883
Missouri
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At first look I would say its a used set of gears, but since they are new, that is not an option. I have been setting up gear sets for 40 years and the last ten with Chinese sets flooding in, the patterns just don't look like they used too. I would as mentioned look at the marking on the pinion to see if contact is in middle of the teeth. The backlash looks good on your pictures, but since it covers the whole tooth you can not tell pinion depth. I purchased a pinon depth tool and if it measures right and the backlash is right with a dial indicator, I don't worry as much any more about the contact pattern. It also matters if the gear set is a hunting or non hunting type, as well as if the gears were hobbed or face milled when manufactured. http://www.shoptalkforums.com/viewtopic.php?t=145363thread about the differences.
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Re: Opinions on this gear contact pattern
[Re: RV2]
#2451238
02/13/18 04:07 PM
02/13/18 04:07 PM
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Joined: Dec 2005
Posts: 11,692 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,692
Fulton County, PA
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You can look at them and tell they aren't used by the finish. They also have very little helix so I assume they are a performance gear and I would expect a little bit of noise. When I mentioned looking at the other teeth, I was talking about the other teeth on the ring gear. As you rotate the gear set, it transfers marking compound to the pinion which, in turn, transfers it bock onto clean teeth on the ring gear. Look at that and see if it indicates what the contact area looks like.
You could also run the pinion in and/or out .006 or so and see if it runs the pattern up or down. You may have hit the depth right where it wants to be.
Used gears are a pain, especially if they aren't going back into the same unit they came out of. Once the backlash opens up, they're junk and not worth fooling with. I will on occasion use an economy gear on a mild application, but I will not use a Chinese gear.
If the results don't match the theory, change the theory.
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Re: Opinions on this gear contact pattern
[Re: RV2]
#2451390
02/13/18 09:26 PM
02/13/18 09:26 PM
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Joined: Dec 2005
Posts: 11,692 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,692
Fulton County, PA
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Looks like he had the stuff glopped on there pretty thick to me. I like to just use a thin schmear. I'd also like to know the brand on that gear set. Where did he get off to?
If the results don't match the theory, change the theory.
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Re: Opinions on this gear contact pattern
[Re: RV2]
#2451435
02/13/18 11:01 PM
02/13/18 11:01 PM
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Joined: Jan 2003
Posts: 3,011 Covington Georgia
RV2
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,011
Covington Georgia
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Sorry guys, I haven't had a chance to reply but I also haven't touched it since. It's a Dana brand gear set. The paste was thick and oily, I'll wipe it down and try something else.
Last edited by RV2; 02/13/18 11:02 PM.
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