![Quote](images/misc/quote_icon.png)
Originally Posted by
coop2005
I did look into this configuration for my cnc router that i am currently building. I think the gravity issues as they pertain to the drive mechanics could be solved using a counter weight as you mentioned, or just finer drive gearing to prevent the tool from falling during power down. I found that the largest shortcoming of this design for me was that when machining pieces that would be cut free you would always have the problem of the piece falling on the bit and ruining the work. With some extra care in your gcode you could try to insure that the cutter finished on the top of the piece; however, this would be quite annoying. If you went with this design i would be prepared to incorporate a vacuum holding system.