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Old 09-10-2013, 06:20 AM
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Default Burned out a chain sprocket

Need new sprocket for a ditch witch.

Drew CAD model from dimensions in Machinist Handbook, applied
offset for my spindle tracer roller (3/8" dia), took CAd file to neighbors
Torchmate machine, applied plasma offset, burned template from 1/8"
plate.

Fired up spindle tracer, cut this from 1 1/4" thick material.
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Old 09-10-2013, 06:37 AM
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Sure could use a CNC plasma table in my shop....
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Old 09-10-2013, 01:50 PM
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D'D', you'd make a Swiss watch maker smile with this one. Pics of the chain?
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Old 09-10-2013, 02:29 PM
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Quote:
Originally Posted by digger doug View Post
Need new sprocket for a ditch witch.

Drew CAD model from dimensions in Machinist Handbook, .
Nice work, digger. This may help, or not.
To save some work, use this free download to design and cut sprockets, and save as dxf. I have cut up to 280 tooth #40 chain
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Old 09-11-2013, 05:54 AM
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Quote:
Originally Posted by Ironman View Post
Nice work, digger. This may help, or not.
To save some work, use this free download to design and cut sprockets, and save as dxf. I have cut up to 280 tooth #40 chain
Looks very nice, thank you.
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Old 09-11-2013, 06:22 AM
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Quote:
Originally Posted by LW Hiway View Post
D'D', you'd make a Swiss watch maker smile with this one. Pics of the chain?
Just normal ditch witch digging chain.

You doo know that if I'd dropped this gear it would probably
break my foot ? It's a bit much for a wrist watch.....
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Old 09-11-2013, 08:57 AM
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digger,

How much work is it to match gear teeth to chain? Talking about beveling and sprocket mounting hole?

Is there enough info in the chain spec to build a sprocket for someone buying and making there own sprocket and chain?
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Old 09-11-2013, 09:54 AM
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Well, this is my first try, the original sprocket looked like a saw blade,
it was so worn.

I did burn out a thin model to try, and it rolled along the stretched out
chain well, and also seemed to engage nicely in the 180 loop.

I will need to face this one down to 1" wide, and leave a hub
on one side (hit's tapered bearing race there).
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Old 09-11-2013, 11:47 AM
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That's just plumb purty, Doug.
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Old 09-11-2013, 06:18 PM
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digger,

Looking good.

This is a 4'x4' table, mines a 2'x2', big enough for gears or sprockets. [URL="http://youtu.be/FHUs_u27IpE"]Sprocket cutting.[/URL Sprocket software.

The picture shows pitch, pitch diameter, and of course the number of teeth. I'm thinking when buying chain some of these numbers will be avalable, don't know.

Got my 2' x 2' table to fit in the corner by overhead door, no room for 4' x 4'.
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Last edited by Vern2; 09-11-2013 at 06:25 PM.
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