Blair:
I cannot urge strongly enough; DO NOT cut a hole in your floor!
Unless you are skilled in the building trade(s), you are not likely to get the floor nearly as strong as it was prior! - POSSIBLE, of course, but not likely.
Among the problems you're opening yourself up to is compromising the structural integrity of the house in the sense of resale value (it WILL come up sooner or later). That is to say; "...why the hell did he cut a hole in the freakin' living room floor - REALLY?"
It WILL look stupid to them, and frankly, your reason, while honest to be sure, DOES sound a bit strange given that there ARE better, SIMPLE ways to do this.
One way I would suggest:
Again, the 2x12's on the steps - BUT: Brace the stairs beneath, obviously. (Assuming) you have exterior access via either a bulkhead (sloping doors over staircase) or a straight (+/-) line from outside to basement.
If you can procure a vehicle-mounted winch (or fasten the cable directly to the vehicle's frame/bumper/tow point/?), play out the line 'til you reach the bottom of the stairs/whatever point you like to make certain you have sufficient. Notice where the line will abrade the floor/edges of steps/etc.. Pad these spots with plywood pieces fixed in place via friction, hot-melt glue, (?),
Then use the vehicle's/winch's muscles to do the heavy work!
An [architect's] suggestion only - but one I have used successfully several times!
I sincerely hope this helps you out...
Warmly, Griz
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"Hey all, " "I tried the methods of 2X12's on the stairs and all that and we just about "killed ourselves moving the lightest machine, a 275 pound bandsaw into the "basement. I have decided that just like my home two houses ago, I will be "cutting a hole in the family room floor and lowering the machines down that "way. I will be starting the hole cutting later this week so I am looking "for suggetions as too mounting back in the floor joists. Last time I "slabbed two more joists on to the existing outer joists and used joist "hangers to run the new inserted joists perpendicular between the outer ones. "This worked well and made it easy to remove the joists for removal of the "tools but I'm wondering if anyone has any better suggestions. " "Next time I move, I should sell the house to a woodworker and save the "hassle of removing the tools. " "Blair "