noobie help with cutting a circle

[Teyber12]

hello!

i gave up learning g-code for the time being because i am using dolphin cad/cam for everything on my x3 cnc mill.

However, now i have to program something a little tricky for me by hand.

I have a 1.5" diameter solid copper round bar.
I want to create a slit for a snap ring thats 1/16" tall and 1/16" deep (making the diameter 1.375" for the bar where the snap ring pops in)
I have a slitting saw that is 3" in diameter. I want to approach it like follows:

(i want the same slit thats on the bottum there)

Could someone help me with this? or point me in the right direction..

Cheers!

[ggborgen]

If I understand you correctly you want just one circle?
This should give you one circle, question marks are for you to fill in because I do not know what offsets you are using or spindle speed and feedrate.

G90G54G00X-2.5Y2.1875M3S???
G90G00G43Z??H??
G01G41Y.6875D??
G01X0.0F??
G91G02Y-1.375J-.6875R.6875
G02Y1.375J.6875R.6875
G90G01X2.5
G91G28G00Z0
M30

[Arlo Tol]

Originally Posted by ggborgen If I understand you correctly you want just one circle? This should give you one circle, question marks are for you to fill in because I do not know what offsets you are using or spindle speed and feedrate. G90G54G00X-2.5Y2.1875M3S??? G90G00G43Z??H?? G01G41Y.6875D?? G01X0.0F?? G91G02Y-1.375J-.6875R.6875 G02Y1.375J.6875R.6875 G90G01X2.5 G91G28G00Z0 M30

I suggest to input the F value in the first line with G01 .. it will save you the error message ..


And why not use only:

G2 I0 J-0.6875

It's enough to run the full circle from and to the starting point.
No need to go G91.

[Teyber12]

Thanks a million guys I have another question i will ask this weekend because i want to try to put some more code together first...

Cheers

[Teyber12]

http://www.cnczone.com/forums/showth...t=76893&page=4

cheers

[Bill Johns]

Part center is X0Y0
T1M6
G90G0G54
X2.3Y0.0
S200M3
G43H1Z2.0
G1Z-.125F100.0
X2.188F4.0
G2I-2.188
G1X2.3
M5
M30
If you set z zero on top of part and bottom of wheel cutter, this would go into the first groove and cut the diameter then pull out and stop. Always run in single block to make sure nothing crashes.

[glenthemann]

I guess I dont know the control but I always thought I and J represented the center of the arc?

[beege]

Originally Posted by glenthemann I guess I dont know the control but I always thought I and J represented the center of the arc?

It is, if the plane is G17 (XY). Some machines define "center of the arc" differently. For most, it is relative to the start point of the arc. For some it is an absolute coordinate, relative to part origin.

Check your machine manual to be sure.

[Teyber12]

thread bump

i almost have figured out the code (er- no thanks to myself! thank you cnczoners)

ok quick questions

1) why do i get a error at line 53, saying that the radius to endarc differs from line 53 when there is no differences in the code between all 5 blocks except the z axis height?

2) How would i add a ring for a snap ring that is 1.375" in diameter in a 1.5" diameter bar, with a 3.5" slitting saw? (i can post a cad drawing to help show what i mean if you guys are lost)

3) How do i change it so it doesn't start cutting at 1.5" In diameter, but at 1.375" in diameter? (it would save a bit of time. In the picture of the evaporator, you can see that the copper diameter is 1.5" but the diameter where the steps are is 1.375". in my program it starts going around thinking its cutting at 1.5" diameter)

4) finally, the copper is getting WAY to hot when i run this program. My mill doesn't have enough torque really to run the proper speeds/feeds, (gotta amp up the rpm's a bit), but what would be a general idea for a good ipm and rpm with a .05" doc?

Cheers guys!

oh, and the slitting saw is 3.5" in diameter (as per the code), but i have two 4" slitting saws on the way. I think this might be better? i will have 1/16" or so of clearance in the y direction with a 4" slitting saw... lol lucky i got the x3 NOT the x2

here is the code.

n001 g0 z1

n002 f8
n003 g0 x-3 y0
n004 g0 z-.125
n005 g1 x-2.5 y0
n006 g2 x-2.45 y0 i2.5 j0
n007 g2 x-2.4 y0 i2.45 j0
n008 g2 x-2.34 y0 i2.4 j0
n009 g2 x-2.3 y0 i2.35 j0
n010 g2 x-2.25 y0 i2.3 j0
n011 g2 x-2.2 y0 i2.25 j0
n012 g2 x-2.15 y0 i2.2 j0
n013 g2 x-2.1 y0 i2.15 j0
n014 g2 x-2.05 y0 i2.1 j0
n015 g0 x-3 y0
n016 g0 z-.25
n017 g1 x-2.5 y0
n018 g2 x-2.45 y0 i2.5 j0
n019 g2 x-2.4 y0 i2.45 j0
n020 g2 x-2.34 y0 i2.4 j0
n021 g2 x-2.3 y0 i2.35 j0
n022 g2 x-2.25 y0 i2.3 j0
n023 g2 x-2.2 y0 i2.25 j0
n024 g2 x-2.15 y0 i2.2 j0
n025 g2 x-2.1 y0 i2.15 j0
n026 g2 x-2.05 y0 i2.1 j0
n027 g0 x-3 y0
n028 g0 z-.375
n029 g1 x-2.5 y0
n030 g2 x-2.45 y0 i2.5 j0
n031 g2 x-2.4 y0 i2.45 j0
n032 g2 x-2.34 y0 i2.4 j0
n033 g2 x-2.3 y0 i2.35 j0
n034 g2 x-2.25 y0 i2.3 j0
n035 g2 x-2.2 y0 i2.25 j0
n036 g2 x-2.15 y0 i2.2 j0
n037 g2 x-2.1 y0 i2.15 j0
n038 g2 x-2.05 y0 i2.1 j0
n039 g0 x-3 y0
n040 g0 z-.5
n041 g1 x-2.5 y0
n042 g2 x-2.45 y0 i2.5 j0
n043 g2 x-2.4 y0 i2.45 j0
n044 g2 x-2.34 y0 i2.4 j0
n045 g2 x-2.3 y0 i2.35 j0
n046 g2 x-2.25 y0 i2.3 j0
n047 g2 x-2.2 y0 i2.25 j0
n048 g2 x-2.15 y0 i2.2 j0
n049 g2 x-2.1 y0 i2.15 j0
n050 g2 x-2.05 y0 i2.1 j0
n051 g0 x-3 y0
n052 g0 z-.625
g053 g1 x-2.5 y0
n054 g2 x-2.45 y0 i2.5 j0
n055 g2 x-2.4 y0 i2.45 j0
n056 g2 x-2.34 y0 i2.4 j0
n057 g2 x-2.3 y0 i2.35 j0
n058 g2 x-2.25 y0 i2.3 j0
n059 g2 x-2.2 y0 i2.25 j0
n060 g2 x-2.15 y0 i2.2 j0
n061 g2 x-2.1 y0 i2.15 j0
n062 g2 x-2.05 y0 i2.1 j0
n063 g0 x-3 y0

*ADD IN SNAP RING GROOVE*
n064 g0 z2

[Mkroe]

Your line number is written as a GCode g053 not N053