Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: natefoerg on March 26, 2013, 02:19:00 PM
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As most 4th axis do, mine has a large gear reduction, 72:1 and further, a 3 to 1 belt reduction. When I am running code, the full rapids are at 100IPM for X, Y and Z, but the A axis moves at a snails pace.
I believe that Mach3 thinks that the A axis is moving at 100IPM, but because it is rotary and with such a heavy reduction, the rotation is crazy slow.
Oddly, when I am not running code and have the jogging feed set at 100, the A axis rotates at an appropriate rate.
Anyone have any ideas on how to fix this?
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Actually Mach is seeing the feedrate in units/min which for the A-axis is deg/min. As you noted 100 deg/min is very slow, (over three and a half minutes for only one rev!).
Mach can convert deg/min feedrate to in/min for a rotational axis. (It is a function of the radius). On the settings page enter the nominal radius of the work in the A-axis ‘Rotation Radius’. Touch off the Z on the surface of the work (to set the starting radius). Then during the cut as the radius (Z value) changes, Mach will calculate the correct feedrate in in/min.
HTH, al
As most 4th axis do, mine has a large gear reduction, 72:1 and further, a 3 to 1 belt reduction. When I am running code, the full rapids are at 100IPM for X, Y and Z, but the A axis moves at a snails pace.
I believe that Mach3 thinks that the A axis is moving at 100IPM, but because it is rotary and with such a heavy reduction, the rotation is crazy slow.
Oddly, when I am not running code and have the jogging feed set at 100, the A axis rotates at an appropriate rate.
Anyone have any ideas on how to fix this?