CNC Circuit Mill/V2 Design Rationale

XY Axes Frame Design Rationale

• The major functions of the XY Axis Frame are to provide rigid mounting surfaces for the precision shafts and leadscrews of the X and Y axes.

• A good way to ensure stability of the Y axis is having a second storey. Given that premise, a cube design makes for ease of manufacturing.

Axis Support

• The function of the axes supports are to stabilize the components that are being moved with the drive

• One option is precision shafts and bearings

• Another option is precision linear slides and V-grooved rollers

Drive

• The function of the drive is to move components

• One option is Stepper motor, leadscrew, leadscrew nut

• Another option is Stepper motor, pulley, tensioning pulley, belt

Spindle Frame

• The spindle system needs to mount a motor and hold the a driveshaft with 2 bearings for over 20,000 rpm.

• The easiest way to ensure alignment of the 2 bearings is to house the driveshaft within 1 part. Meanwhile, the motor can be mounted on another. Both parts need to be secured together in position.

• Let's start with 1 rectangular bar, 1 flat bar, and 1 angle:

• The idea here is that the motor can be mounted on the angle; meanwhile the driveshaft can be held inside the rectangular bar by 2 ball bearings, 1 at each end. The flat bar is there to secure the angle and rect. bar together.

• However, if the desire is to hold the driveshaft at the top and bottom, a C-Channel can replace the block, with various implications.

• Here is a visual example: