Hi all,

I have a table-table setup with a B and C (I think- Z axis rotary on top of a Y-axis rotary). All my directions and angles are working out fine, and I'm getting good numbers out.

My main issue is that I would like to stop the machine from "flipping" the primary rotary. For instance, if I am machining a dead center 180deg arc over a hemisphere, my B axis will go from -90 to 0 to -90. In the small degree range the primary has to accelerate pretty high. I'd rather the B-axis continue on an just go straight from 90 to -90. I'm not actually machining anything, it would be more like a probe run.

I'm using the generic HAAS 5-axis post that I've modified to include my limits and directions. I am using the mi10 = 0. Here is what I think are the relevant sections.

#Assign axis address

str_pri_axis : "C"

str_sec_axis : "B"

str_dum_axis : "A"

#Toolplane mapped to top angle position strings

str_n_a_axis : "A"

str_n_b_axis : "B"

str_n_c_axis : "C"

#Machine rotary routine settings

mtype : 0 #Machine type (Define base and rotation plane below)

#0 = Table/Table

#1 = Tilt Head/Table

#2 = Head/Head

#3 = Nutator Table/Table

#4 = Nutator Tilt Head/Table

#5 = Nutator Head/Head

#Primary axis angle description (in machine base terms)

#With nutating (mtype 3-5) the nutating axis must be the XY plane

rotaxis1$ = vecx #Zero

rotdir1$ = vecy #Direction

#Secondary axis angle description (in machine base terms)

#With nutating (mtype 3-5) the nutating axis and this plane normal

#are aligned to calculate the secondary angle

rotaxis2$ = vecz #Zero

rotdir2$ = vecx #Direction

#Secondary shift (determines position and angle calculation)

#plane correction 90 degree shift case (plus or minus)

#used when secondary plane is defined perp to primary zero

#EX. P - vecx, vecy S - vecz, vecy

shift_90_s : 1 #Shift pos.=1, neg.=-1

#Rotary axis limits

adj2sec : 0 #Attempt to adjust the primary axis from secondary?

#Allows primary axis to flip 180 to satisfy secondary

#0 = Off

#1 = Use method when secondary is out of limit

#Use with pri_limtyp = one to keep secondary as controlling

#limit when limit tripped

#Use with pri_limtyp = two to allow 180 degree reposition

#Set pri_limtyp and sec_limtyp on following conditions

#0 = Less than 180 degrees

#1 = Equal or greater than 180 degrees and less than 360 degrees

#2 = Soft limit at 0-360 degrees with hard limits slightly beyond

#Set limhi-limlo to hard limits, inthi-intlo to 360 degrees total

#limhi-limlo are expected equal amount from inthi-intlo

#3 = Greater than 360 degrees

auto_set_lim : 0 #Set the type from the angle limit settings (ignore these)

pri_limtyp$ : 3

sec_limtyp$ : 1

#Rotary axis travel limits, always in terms of normal angle output

#Set the absolute angles for axis travel on primary

pri_limlo$ : -9999999

pri_limhi$ : 9999999

#Set intermediate angle, in limits, for post to reposition machine

pri_intlo$ : -9999999

pri_inthi$ : 9999999

#Set the absolute angles for axis travel on secondary

sec_limlo$ : -95

sec_limhi$ : 95

#Set intermediate angle, in limits, for post to reposition machine

sec_intlo$ : -95

sec_inthi$ : 95

bias_null : 0 #mi4 and mi5 bias are applied at null toolchanges

use_clamp : 1 #Use the automatic clamp Mcode

#Table/Table spindle axis alignment. (Typically Z+. Always Z+ with nutating machine types!)

# Choose the axis that is parallel to the spindle with all rotaries at their zero positions.

spind_align : 3 #1=(X+), 2=(Y+), 3=(Z+), -1=(X-), -2=(Y-), -3=(Z-)

#Machine base matrix (Base matrix to map positions into)

matb1$ : 1

matb2$ : 0

matb3$ : 0

matb4$ : 0

matb5$ : 1

matb6$ : 0

matb7$ : 0

matb8$ : 0

matb9$ : 1

#Tolerance settings for wind up

p_tol_ang : 210 #Primary angle move to exceed for direction change

s_tol_ang : 210 #Secondary angle move to exceed for direction change

d_tol_ang : 210 #Dummy angle move to exceed for direction change

#pri_limtyp = 1, tolerance to validate tripping limit

# reset the p_frc_adj_sec flag when back to normal range

#pri_limtyp = 2, angle move >= to trigger reposition on primary and

# angle move >= with rev5 or 180 reposition to validate tripping limit

p_rsoft_tol : 45

#sec_limtyp = 2, Angle move >= for reposition

s_soft_tol : 270

adj_lim_trp : 90 #Angle move in p_pri_rot180 to trip reposition

#pri_limtyp = 3 and sec_limtyp = 3 control values

p_rsoft_tol3 : 45 #Angle move >= with rev5 or 180 reposition

Thanks so much for the help in advance!

Hi,

Can anyone tell me how to create a parallel cut (5-axis) toolpath with equidistant spacing no matter the surface angle? I'm using X6.

If you can picture it, I am basically trying to get parallel arcs across a hemisphere that have equidistant contours between them. I've been playing around a lot, but I can only get constant shifts in one axis. I would think that if there were an option for "constant cusp" then it would probably work to bring the spacings correctly.

Thanks!