New Departure A cog/sprocket frankenhub question

[gkeep]

Hello All knowing ones.

For you consideration, the photo of very worn teeth of the New Departure Model A on my Pierce. The chain is missing 8 rollers and a few others are split from wear. This chain and hub have been together a while I'm guessing. Also in the photos is a driver and cog I found, ND Model D driver? Can anyone ID this?

I'm wondering if it would be sacrilege to replace the original worn cog with it's newer cousin, though it's a shame to mix patina'd nickel parts and newer chrome. Please don't banish me for suggesting this is possible in my youthful ignorance...

 

[rustyspoke66]

You can swap the cog but the drivers are not compatible. If changing the cog makes it usable I would go for it.

 

[Kurt S.]

Don't know how handy you are with a welder & grinder, but if I couldn't replace it, i'd weld up the worn teeth and grind them back to shape. It's a bit of farmers type thinking, but with a wet cloth protecting the finishes it should turn out good, with a little patience. The weld will be a bit harder than the original steel, I don't think it would hurt the chain.

 

[gkeep]

Thanks for the advice. I had thought about building up the worn teeth. I am not a welder or machinist but I have some coworkers, friends and neighbors who are. I like to keep things as original as I can though of course it's all assuming these are original components and not replacements someone put on in the 50s or 60s... Given the condition of the bike when I found it in a pile of construction debris with just a pedal sticking out from a pile of lathe and plaster and wall studs who knows where this old beast has been?

It's not going anywhere though until I get the tire shipment from Moruya Cycles in Australia to replace the tire with the bead tearing out...

Gary

 

[filmonger]

Just get a nice Patina'd Cog from one one of the guys here.... No hassle and it keeps her lookin good.

 

[Iverider]

When your cog is that worn you can probably bet your chain has stretched a bit, if not a fair amount. If it has stretched, replacing the cog will look better for awhile, but it'll wear faster because the chain doesn't interface with the cog like it should.

 

[gkeep]

Thanks,
I do have a replacement chain soaking in oil. It just needs two more lengths added to match the 54 link chain on the bike now.

Gary