Rotary Axis

Hi all,
I decided to install 4-axis to my milling machine.
Everything is working but I have a problem with A-axis motion.
When I use only A-axis, the motion is slow. When I move X or Y-axis the A-axis rotates faster.
What could be the cause? EMC2 I'm using version 2.3.3
Thanks for your help.

Hi,

If there is no linear axis move, then your speed is in Degrees per min.

Dan

it's not this

are the settings the same then x y axis

A-axis is stepper motor
X,Y,Z-axis Analog Outputs: +/-10V

[TRAJ]
AXES = 4
COORDINATES = X Y Z A
HOME = 0 0 0 0
LINEAR_UNITS = mm
ANGULAR_UNITS = degree
CYCLE_TIME = 0.01
DEFAULT_VELOCITY = 80
DEFAULT_ANGULAR_VELOCITY = 80
MAX_ANGULAR_VELOCITY = 100
MAX_VELOCITY = 100
DEFAULT_ACCELERATION = 1000.0
MAX_ACCELERATION = 1500.0

Please change your Speeding control in A-axis and X-axis or Y-axis..

CNC vertical milling machine.
X-axis travel 132";
Y-axis 7".
2HP A-axis drive.
Ajax 3-axis CNC control Linux based conversational,
M or G-codes.
Can be set up with conventional milling head or revolver sharpening attachments.
Milling Head: Central Machinery 12-speed belt drive milling head.
120-2,500 rpm. 1-1/2 HP 115/230/1.
Spindle travel 5".
Drill capacity 1-1/4";
face mill 3"; end mill 3/4".

R8 spindle taper. Note: Miller base with 8" x 29" work table included. Revolver Sharpening attachment: 4" DeWalt disc grinder (see video

www.emd-usa.com/

You might want to look here...

linuxcnc.org/docs/html/gcode_main.html#sub:G93,-G94:-Set

G94 is Units per Minute Mode

G95 is Units per Revolution Mode.

Three feed rate modes are recognized: units per minute, inverse time, and units per revolution. Program G94 to start the units per minute mode. Program G93 to start the inverse time mode. Program G95 to start the units per revolution mode.

In units per minute feed rate mode, an F word is interpreted to mean the controlled point should move at a certain number of inches per minute, millimeters per minute, or degrees per minute, depending upon what length units are being used and which axis or axes are moving.

In units per revolution mode, an F word is interpreted to mean the controlled point should move a certain number of inches per revolution of the spindle, depending on what length units are being used and which axis or axes are moving. G95 is not suitable for threading, for threading use G33 or G76.

In inverse time feed rate mode, an F word means the move should be completed in [one divided by the F number] minutes. For example, if the F number is 2.0, the move should be completed in half a minute.

When the inverse time feed rate mode is active, an F word must appear on every line which has a G1, G2, or G3 motion, and an F word on a line that does not have G1, G2, or G3 is ignored. Being in inverse time feed rate mode does not affect G0 (rapid traverse) motions.

Rick G

and here..

www.linuxcnc.org/docview/html/common_mac...r.html#sub:Feed-Rate

Rick G

Yep old thread, but for any one who might be searching the old threads for answers.