CNC_0006

MAKE: Workbench - C-axis - Assembly

Rotation about Z-axis.

Non-powered Alternative:

Forget the B-axis, at least in the beginning. Simply have a flared end at the bottom of the vertical feeder tube or a small horizontal roller where it's frame freely pivots around a vertical axis.

Powered Alternative:

Dispenser Rotation:

There may have to be a fifth axis A rotation about the Z-axis. The again;

Perhaps this C-axis will only require the X and Y-axis. to do the winding. This is because the rotating horizontal finger on the C-axis may allow for positioning of the tow at each end. See the sketch below.

A linear axis might control the B-axis. This is because there is no desire to rotate more than 360º. In fact, continuous rotations will windup the tow.

Preliminary Considerations:

Motor for C-axis:

The gear motor might be 12 VDC and powered from a second CNC4PC Mini Power Supply. However, if only 12 VDC it will not be able to be controlled by a Gecko servo drive. This means that it will need its own limit switches, timers and reversing switches. It also means that the operation is not timed in with the other 4 -axis.

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A quick and dirty preliminary guess on MY part ~ 100 oz-in stepper motor. Convert to Servo

At point of work ~ 90 oz-in of torque @ 30 rpm. At motor ~ * 3 Guesstamite

The minimum voltage that the Gecko will handle is 18V.

Physical Demands on Motor: C-axis - Rotary:

Very small gearmotor with encoder for wrapping tow around root pins on spar???

See Motor for B-axis:

Guesstimate at Frame size:

Initial Perceived Requirements:

"Start with checking the minimum possible move distance. This is the absolute limit to the accuracy of the work done on the machine." ~ from Mack3Mill document Section 4.5.2.

Minimum possible move distance =

Unit:	Force; [F]	*	Distance: [u]	/	Time; [s]	=	Power [P]
English	lbf or ozf	*	inch, foot	/	second,minute	=	ft-lbs/min; HP
		*		/		=	m-Kg/sec
metric SI	newton	*		/		=	joule
		*		/		=	Watts

Home and Travel Limit Sensors:
Consider using Parker Daedal units. This will give standardization on all three linear axes. Might also consider one of the units of the baby linear slide for C-axis home and or Limits.

For now see; OTHER: Composite - CNC Workstation - Workbench - B-axis - Overview

Calculations:

Motor:

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Last Revised: June 8, 2007