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Reply by LesB

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Posted on Help with figuring out what kind of router bits are needed for old trim Re-creation

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LesB

2598 posts in 4289 days


#1 posted 02-14-2018 02:53 AM

For this limited production and assuming you have a table saw I would suggest finding some molding head cutter sets. Craftsman use to make them and I just check and they are still available inexpensively on eBay. I have made good use of them for this type of a problem. They are high speed steel so if there isn’t one already made you can grind you own shape. You will need to make a custom insert for your saw table and set up some hold downs on the saw to keep the wood in the proper position as you run it through. Don’t try to take off too much wood at a time, make a couple of passes or more and wear ear protection; it can be noisy. Assuming you will use a soft wood like pine of popular this will work quite well.

My approach would be to make the step flat and inner round over first and it would help if the board were slightly wider so you have some support on the outside of the step which you can cut off later. For the other two round overs you can use a router with a round over bit. It would be best to use a router table with a fence to control the cut; particularly for the step side which is not tall enough for a bearing guide.
There are two different types of shaper heads. One takes only one blade which would make it easier to customize the shape you want from a flat ended cutter. The other takes three cutters so you would need to make all three the same shape or at least close to the same because which ever one stands proud of the others will determine you final cut.

Here is a UTube video on using the shaper. https://www.youtube.com/watch?v=uMVIaB7y_sQ

Here is a sequence of cuts to make. The last relief cut can be made using a flat cutter in the molder heat.

-- Les B, Oregon


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