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  #11  
Old 11-26-2022, 05:27 PM
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General preheating on the cutting edges up north is 250f before welding, interpass temps not to exceed 400f.

Ramp down is 50F at a time, with a half hour at each temp before dropping to the next temp.

Without knowing what material the original is, it does become more of a guessing game.

I would certainly do some after welding heat treat, even if it’s just in an oven/toaster oven. Wrap it in foil to minimize oxygen, (can even add a couple small strips of paper to let the oxygen burn off when they catch fire), and soak it overnight at 400F. Do a slow cool, 50F at a time the next day.

The transition at the edge of the old material and new will still be a mix of alloys, so could be hard from the original material. Be careful when you try to turn that on the lathe.


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  #12  
Old 12-30-2022, 08:34 PM
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Well I made a new sprocket out of stainless and it will last until it doesn't.
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  #13  
Old 12-30-2022, 10:04 PM
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I suspect it will outlast both of us once again the "Real Deal" delivers
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  #14  
Old 12-30-2022, 10:30 PM
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Well done and thank you for the posting of the drawing.

Scott
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  #15  
Old 01-01-2023, 07:49 AM
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Nice job. Sorry I have not got an answer on the one i knew about for potential parts.

I’m sure that will work for a great while. Maybe have 60% less life expectancy before wearing out due to wear.

Thanks for the great drawing. I guess I never occurred to me that you would need to use two different end mills to cut the teeth, to get the ramp angles clearance right.

I think I made a gear once and I crudely filed/ ground in the secondary angle relief.


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  #16  
Old 01-01-2023, 02:36 PM
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Quote:
Originally Posted by toprecycler View Post
Nice job. Sorry I have not got an answer on the one i knew about for potential parts.

I’m sure that will work for a great while. Maybe have 60% less life expectancy before wearing out due to wear.

Thanks for the great drawing. I guess I never occurred to me that you would need to use two different end mills to cut the teeth, to get the ramp angles clearance right.

I think I made a gear once and I crudely filed/ ground in the secondary angle relief.


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This was not the proper way to mill a sprocket, the only cutter I could find would only good for a nine tooth sprocket and the diameter was to large for such a small sprocket and was quite expensive. The two end mills worked perfect I just had to bevel the tips with a belt grinder.
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