I did it a when we were first married and I wanted to make some of our furniture. It worked pretty well. In those days you could frequently find plans for such saw tables in home how-to magazines. I hung the saw from a 3/4 inch plywood table top with two 1/4 inch screws and wingnuts. I used adjustable stops at the front and back of the saw base so I could take the saw out to use in a conventional way and then put it back into the table and it would be perfectly aligned again.Use the edge of a piece of plywood for a rip fence. Set the blade cutting depth so the teeth come through the wood you are cutting ony about 1/16 inch. If you have an accident, it will be a small flesh wound. I did a couple of Instructables you should look at.https://www.instructables.com/id/Get_More_from_Your_Circular_Saw/https://www.instructables.com/id/Bench_Saw_Table_for_a_Wood_Lathe/There are things in both of these Instructables that will help you, including how to make your own miter gage.
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I would disagree with caitlinsdad and say that a converted circular saw can be safe.
Sorry I'm not posting plans. I have made a table circular saw and it works great. In the question, it says small circular saw. My saw draws 15 amps at 120V. I have not used it in a while b/c I'm at school right now, but I think it can cut 3". I would consider these specs to be in the useful range. I don't think a smaller saw would be that useful (for me).
As far as safety is concerned, I think the easier a tool is to use the safer, more precise, and more enjoyable it is. Make jigs for all your tools.
For my saw I have the angle iron fence set parallel with the blade. I also have an adjustable featherboard for convenience and I think it makes it safer. The featherboard uses a cam/eccentric to quick clamp to the best location. I added a riving knife too b/c I think it keeps the finish of the wood going out a little smoother and with fewer circular marks. The riving knife makes it safer too. I also use a push shoe.
At the woodshop I worked at with a real table saw, they only used a riving knife, a push shoe, and their finger for a featherboard to keep the wood against the fence. I always used another pushshoe flat on the saw top so I could save my fingers from friction. I never saw any accidents.
I think other safety guards may be to protect from incorrect use maybe?...
I always found my setup to be equal to the woodshop's high quality saw.
And did I mention I also put the all important tape measure on my saw setup? Now that makes things so much easier.
Basically I just routered into a piece of plywood the depth of the base plate, cut out necessary parts of plwood that would be in the way, unbolted the base plate, and then bolted the saw back together with the plywood in between. Then I drilled four countersunk holes for four bolts threw the base plate and plywood. I reinforced the plywood in places to keep it strong. I made an angle iron fence of three pieces to make a triangle. The fence has an cam/eccentric to quickly clamp to another piece of angle iron. I used plexiglass or something with a scratched line to see the ruler beneath. The on switch I copied from the woodshop saw. I bought a cheap wall electric switch rated to 15 amps and cover for under $1.50. I drilled a hole through the tip of the plastic. Then I connected a rod. The rod then connects to a wooden hinge. The axle of the hinge is above the rod and is horizontal. The hinged is surrounded somewhat to make it possible to pull and turn the saw on by only by putting my fingers into a recess and pulling the hinge. This pulls the rod which pulls the wall switch to the on position. To turn off, I just bump the hinge with my knee and off it goes. Essentially, its just a four bar linkage that can't go on by accident.
Of course after I made the saw I saw things I could have done to make the job easier, but it works just fine.
Please know that a circular saw inverted and converted to be used like a table saw by rigging it up in a jig is quite dangerous. A circular can be used like a "panel saw" the way it was designed to be used with additional guides and attachments. Be safe.
Yes.Did you even try the search function?