Custom scotia: router or tablesaw?

I need to make a piece of custom scotia molding for under the treads of our staircase.
I need to match existing trim that is 100+ years old and I have not been able to find the size in the store.
The dimensions are: 3/4 x 1/2" The lip dimensions are 1/3" on the 1/2" side and 1/8" on the 3/4" side (these dimensions are different from what I have seen on modern Scotias)
- What is the best way to fabricate and replicate the molding myself?
- If I use a router, what type of bit should I use? cove?? If so, what size.
- Other people have suggested using a tablesaw with the wood at angle to the blade. If so, how do you decide what angle to use?
Finally what are the advantages and disadvantages of each approach?
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blueman wrote:

I don't think a TS can make the cut you need. That method is more for larger coves like on crown molding. http://www.binkyswoodworking.com/CoveMouldingTip.htm
To do this with a router you will need a router table and probably a fence, the bit will depend on the shape you need. You may also need to use wedges depending on the angle needed.
http://www.ronhazelton.com/howto/door_casing_restoration.htm
http://www.woodweb.com/knowledge_base/Replicating_a_Custom_Moulding_Profile.html
Try rec.woodworking, the pros there can either tell you how to do it or where to buy it. It would be helpful if you could post a picture of the profile you need.
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http://www.woodweb.com/knowledge_base/Replicating_a_Custom_Moulding_Profile.html
Or use a molding attachment for the TS : http://images.google.com/images?hl=en&sa=N&resnum=0&q=molding%20head%20table%20saw&tab=wi
The blank profiles could be grinded to match scotia if a standard profile could not be found.
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