I need to cut tops of 6×6 p/t and cedar posts to a pyramid shape. The post are already set (190). Is there any tool available or jig to do it in a fast and efficient way.
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Use a circular saw with the blade tilted to the appropriate angle. To get all the cuts straight and aligned, use some clamps and clamp a scrap of 2 x 4 horizontally to the post as a guide. Hold the saw with the base flat against the vertical side of the post, with the edge of the saw base running along and guided by the 2 x 4. Do one side at a time and move the 2 x 4 around. If the blade is not deep enough to cut all the way through, finish the cuts with a hand saw.
Make it even easier than Wayne's suggestion. Create a collar that can slip over the posts and get secured (screws or clamps) to create a guide for the saw. Then you just run the saw around all four sides of the post without having to move the guide.
Oh, and get ready for some sore arms from holding the circular saw up there for days. If I read your post right, you have 190 of these to do? Yuck....
What about adding a pre-formed pyramid cap to the tops of the existing posts?
Bob
Holy cow, I didn't understand that there were 190 posts to do. Sure, a box that goes all around would be faster with so many to do.
Wow, and I was thinking the posts were 190" long (and assuming that 42-48" was in ground). If the quantity is 190, a built on the ground cap is probably a better solution. A box jig, or, really, a radial arm saw would be ideal for the caps (6x6 a little deep for the miter box). I'd use a half lap joint to fasten the "points" on (the depth of the lap to match the deepest cut your circular saw will make on the top of the post. Or, bore the point and the post for a dowel. The joint will likely need a rabbet or a bevel to clean up the joint.
But far better to built the points, then only climb the ladder to install them. rather than chasing arounf the post with the ladder.
Oh, and if the points absolutely have to be cut in place, a box jig around the post is the best way, but use a portable bandsaw instead of a circular saw on those 6x6s.