I am building my very first CNC mill. The purpose of the mill is to cut pieces out of 1/2" aluminum plate. I am making simple parts that have been made by band saw and belt sander to date. It takes me a day to get the part perfect now, and it's just not efficient enough.
My mill design is: X=24", Y=36", Z=12" I'm using four (2 pairs) linear bearings on chrome shafts that flank a quality ACME screw with anti-backlash nuts for Y and Z axis, and parallel chrome shafts on each side of the machine with twin pillow bock bearings for the Y axis, and a single 36" ACME screw down the centerline of the machine under the table. For a spindle, I have a 2.25HP Porter Cable router with a 1/2" chuck that destroys aluminum with a carbide 2 flute end mill already (I tried in vain to cut my parts by hand with the router instead of the band saw, but the sanding needed after to clean up the cut still takes most of the day).
Now, I was about to purchase this 4 axis setup on Ebay, and using 3 270oz motors for this project (I want to build a 4th axis on a rotary table later).
I wasn't sure the 270oz motors were powerful enough to properly move the machine around to get fairly accurate parts, so I emailed the vendor to ask his opinion. Surprisingly, he said "it would work, but you would be better off with the kit on this page with the same motors." They seemed to think the controller board used in the kit on Ebay was the weak link.
Now, since I am new to this game, I want to purchase something reliable and pretty much plug and play with my laptop and Mach3. I see there are quite a few posts in this forum about the TB6560 board, some folks modifying and using them, some complaining about them. Money is tight, so to buy the kit they suggest is outside my budget, however, I don't want to spend months getting the dang thing to work.
So I'm here asking your expert opinion. First, are 270 oz motors up to the task? Second, is the TB6560 board up to the task? If not, I'd like to hear your opinions on what you think I should do. Z axis is pretty heavy with the big router on it, and the screw is 10 pitch, and the whole reason I asked the question was to find out if the 270 oz motors would hold the heavy axis in place, but now that I've read what I've read, I'm not sure of anything anymore. Your help is greatly appreciated.