I agree with Leo 100%. Utilize the resources available to you (the concrete supplier's engineers).
That said, the general guidelines given are good ones.
6" lifts maximum, then compact with a jumping jack.
On the subject of water. Your profile says Pacific North Wet (typo?) so my assumption...
I'm with Mclean. There's no way you will get good results with hand tools while keeping your sanity. This is an easy job for a shop with a lathe. 10" diameter is not that big. And $7 a cut sounds reasonable for my area (southeast PA).
Also, I would not use a bandsaw our portaband for this cut...
I would be hesitant to build directly on the pad without knowing more about it's construction. Assuming it is a floating slab I would be more worried about the frost heave you will get in the colder months. This could destroy a well built building in no time. Stick built or steel, if you jack...
kart-racer,
That's a nice setup. I guess I am coming at this from my industrial frame of mind when really what was asked was some experience with home use systems. Sometimes I need to remember to take off my engineer hat and put on my garage hat.
For home DIY use, those setups look great...
Unfortunately, it's not usually a good idea to use a system designed for the collection of one type of material for a different material. All materials have different conveyance velocities needed for good collection and to ensure no drop out. For metals, the minimum duct velocity used to be...
Industrial cyclone dust collectors have a blower connected to the top of a very steep conical chamber. This is the outlet. The inlet is located tangential to the circumference of the cone a short ways down from the outlet . As air enters the chamber it spins around and out the outlet. Dust...
I'd be quite hesitant to work under something supported by just one level of these blocks, let alone three. Lx460 hit the nail on the head:
I'll add that these are also commonly made in the field at construction sites by concrete contractors to get a little more money out of the job. They...