Facts to consider when choosing table size
Before buying a CNC Router it is important to choose the correct size table for the work you plan on doing. It would be upsetting to order a 2450 x 1250 table only to get a job that requires 3000 (3m) long material… Some of the more important factors in making this decision are listed below.
For production, the table should be bigger than the largest sheet of material that you would use. If you are planning on doing lots of nesting work, then this is even more important. The efficiency of the nesting improves with the size of the board increases.
Available space is a factor, however, if you plan on running high production then find the space rather than limiting your work area.
Precision work is best done on smaller machines and preferably with ball screw drives. We have built routers for mold work that can work to an accuracy of 20 microns. The bigger the Routers the more inaccurate they become. This is because the ball-screw and racks used to drive these machines have an accuracy that is measured per meter. The longer the ball-screw or rack the more the deviation.
For small, detailed work, a small machine may suffice as the cost of cutting the material to size prior to routing would be minimal
The cost of the machine is not in proportion to its size as the bed gets bigger the cost of the table drops.
The cost of the servo drives will increase as the speed requirements increase. The bigger the table the faster the machine should move. Rigidity is really important on big machines. If you need a big table, make sure it does not vibrate or flex while cutting.