[theemudracer]

I think I remember seeing some sort of a calculator on this forum that would right your g-code for milling a sprocket but I cant find it now.

My second question is does anyone have a macro for milling sprockets in a lathe?? The tooth profile is nothing but radius's on this part that I am doing.'

It is 15.165 in diameter with 30 teeth, using #120 roller chain.

I got a good start on it today using G12.1 but it took me 8 hrs to prg. half of it. (LOTS OF NUMBERS).

The other option I thought of was some kind of a repeat event, Maybe a WHILE DO macro that I am familar with.

Any idea guys???
thanks
Jon

[Bluesman]

I think I remember seeing some sort of a calculator on this forum that would right your g-code for milling a sprocket but I cant find it now.

My second question is does anyone have a macro for milling sprockets in a lathe?? The tooth profile is nothing but radius's on this part that I am doing.'

It is 15.165 in diameter with 30 teeth, using #120 roller chain.

I got a good start on it today using G12.1 but it took me 8 hrs to prg. half of it. (LOTS OF NUMBERS).

The other option I thought of was some kind of a repeat event, Maybe a WHILE DO macro that I am familar with.

Any idea guys???
thanks
Jon

Send me the G-Code (Private Mesage) you wrote for the first few teeth and I will see if I can come up with a macro that will do what you need. I am having a slow week since my hard drive on my main desktop crashed and burned friday so I got some time on my hands

Bluesman

[Bluesman]

I think I remember seeing some sort of a calculator on this forum that would right your g-code for milling a sprocket but I cant find it now.

My second question is does anyone have a macro for milling sprockets in a lathe?? The tooth profile is nothing but radius's on this part that I am doing.'

It is 15.165 in diameter with 30 teeth, using #120 roller chain.

I got a good start on it today using G12.1 but it took me 8 hrs to prg. half of it. (LOTS OF NUMBERS).

The other option I thought of was some kind of a repeat event, Maybe a WHILE DO macro that I am familar with.

Any idea guys???
thanks
Jon

Oh stink you need to send me the print too

Bluesman

[theemudracer]

Ok sounds good. I will try to have the night shift guy email me the info this evening and I will post it. Other wise it will be tomorrow before I can get you the print and prg.

thanks
Jon

[theemudracer]

Here is the complete prg. I also attached the .dxf file of the part.

%
O7005(411-47004 SPROCKET)
M118M32
G40G28U0
G99G28B0


(ROUGHING END MILL)
G54G98
T0202
M43
G0C0.
G97S2000M13
G0Z10.
X16.
G12.1
G42G1X15.1574C0.F15.
G03X14.1254C.3187R.8073
G02X13.9492C1.1567R.4375
G03X14.8262C1.5757R.8073
G03X13.6842C1.7801R.8073
G02X13.1634C2.5815R.4375
G03X13.847C3.0825R.8073
G03X12.645C3.1638R.8073
G02X11.8024C3.8935R.4375
G03X12.2626C4.4547R.8073
G03X11.053C4.4092R.8073
G02X9.9254C5.0354R.4375
G03X10.1424C5.6321R.8073
G03X8.978C5.4618R.8073
G02X7.6146C5.9571R.4375
G03X7.5788C6.5634R.8073
G03X6.5108C6.2758R.8073
G02X4.9712C6.6185R.4375
G03X4.6838C7.2078R.8073
G03X3.7588C6.8155R.8073
G02X2.1104C6.9907R.4375
G03X1.5844C7.5372R.8073
G03X.8426C7.0573R.8073
G02X-.8426C7.0573R.4375
G03X-1.5844C7.5372R.8073
G03X-2.1104C6.9907R.8073
G02X-3.7588C6.8115R.4375
G03X-4.6838C7.2078R.8073
G03X-4.9712C6.6185R.8073
G02X-6.5108C6.2758R.4375
G03X-7.5788C6.5634R.8073
G03X-7.6146C5.9571R.8073
G02X-8.978C5.4618R.4375
G03X-10.1424C5.6321R.8073
G03X-9.9254C5.0354R.8073
G02X-11.053C4.4092R.4375
G03X-12.2626C4.4547R.8073
G03X-11.8024C3.8935R.8073
G02X-12.645C3.1638R.4375
G03X-13.847C3.0825R.8073
G03X-13.1634C2.5815R.8073
G02X-13.6842C1.7801R.4375
G03X-14.8262C1.5757R.8073
G03X-13.9492C1.1567R.8073
G02X-14.1254C.3187R.4375
G03X-15.1574C0.R.8073
G03X-14.1254C-.3187R.8073
G02X-13.9492C-1.1567R.4375
G03X-14.8262C-1.5757R.8073
G03X-13.6842C-1.7801R.8073
G02X-13.1634C-2.5815R.4375
G03X-13.847C-3.0825R.8073
G03X-12.645C-3.1638R.8073
G02X-11.8024C-3.8935R.4375
G03X-12.2626C-4.4547R.8073
G03X-11.053C-4.4092R.8073
G02X-9.9254C-5.0354R.4375
G03X-10.1424C-5.6321R.8073
G03X-8.978C-5.4618R.8073
G02X-7.6146C-5.9571R.4375
G03X-7.5788C-6.5634R.8073
G03X-6.5108C-6.2758R.8073
G02X-4.9712C-6.6185R.4375
G03X-4.6838C-7.2078R.8073
G03X-3.7588C-6.8155R.8073
G02X-2.1104C-6.9907R.4375
G03X-1.5844C-7.5372R.8073
G03X-.8426C-7.0573R.8073
G02X.8426C-7.0573R.4375
G03X1.5844C-7.5372R.8073
G03X2.1104C-6.9907R.8073
G02X3.7588C-6.8115R.4375
G03X4.6838C-7.2078R.8073
G03X4.9712C-6.6185R.8073
G02X6.5108C-6.2758R.4375
G03X7.5788C-6.5634R.8073
G03X7.6146C-5.9571R.8073
G02X8.978C-5.4618R.4375
G03X10.1424C-5.6321R.8073
G03X9.9254C-5.0354R.8073
G02X11.053C-4.4092R.4375
G03X12.2626C-4.4547R.8073
G03X11.8024C-3.8935R.8073
G02X12.645C-3.1638R.4375
G03X13.847C-3.0825R.8073
G03X13.1634C-2.5815R.8073
G02X13.6842C-1.7801R.4375
G03X14.8262C-1.5757R.8073
G03X13.9492C-1.1567R.8073
G02X14.1254C-.3187R.4375
G03X15.1574C0.R.8073
G40G1X16.F40.
G13.1
M09
G28U0.
M15
M40
G0Z5.

(.500 FINISH)
G54G98
T0909
M43
G0C0.
G97S1668M13
G0Z-.6
X16.
G12.1
G42G1X15.1574C0.F10.
G03X14.1254C.3187R.8073
G02X13.9492C1.1567R.4375
G03X14.8262C1.5757R.8073
G03X13.6842C1.7801R.8073
G02X13.1634C2.5815R.4375
G03X13.847C3.0825R.8073
G03X12.645C3.1638R.8073
G02X11.8024C3.8935R.4375
G03X12.2626C4.4547R.8073
G03X11.053C4.4092R.8073
G02X9.9254C5.0354R.4375
G03X10.1424C5.6321R.8073
G03X8.978C5.4618R.8073
G02X7.6146C5.9571R.4375
G03X7.5788C6.5634R.8073
G03X6.5108C6.2758R.8073
G02X4.9712C6.6185R.4375
G03X4.6838C7.2078R.8073
G03X3.7588C6.8155R.8073
G02X2.1104C6.9907R.4375
G03X1.5844C7.5372R.8073
G03X.8426C7.0573R.8073
G02X-.8426C7.0573R.4375
G03X-1.5844C7.5372R.8073
G03X-2.1104C6.9907R.8073
G02X-3.7588C6.8115R.4375
G03X-4.6838C7.2078R.8073
G03X-4.9712C6.6185R.8073
G02X-6.5108C6.2758R.4375
G03X-7.5788C6.5634R.8073
G03X-7.6146C5.9571R.8073
G02X-8.978C5.4618R.4375
G03X-10.1424C5.6321R.8073
G03X-9.9254C5.0354R.8073
G02X-11.053C4.4092R.4375
G03X-12.2626C4.4547R.8073
G03X-11.8024C3.8935R.8073
G02X-12.645C3.1638R.4375
G03X-13.847C3.0825R.8073
G03X-13.1634C2.5815R.8073
G02X-13.6842C1.7801R.4375
G03X-14.8262C1.5757R.8073
G03X-13.9492C1.1567R.8073
G02X-14.1254C.3187R.4375
G03X-15.1574C0.R.8073
G03X-14.1254C-.3187R.8073
G02X-13.9492C-1.1567R.4375
G03X-14.8262C-1.5757R.8073
G03X-13.6842C-1.7801R.8073
G02X-13.1634C-2.5815R.4375
G03X-13.847C-3.0825R.8073
G03X-12.645C-3.1638R.8073
G02X-11.8024C-3.8935R.4375
G03X-12.2626C-4.4547R.8073
G03X-11.053C-4.4092R.8073
G02X-9.9254C-5.0354R.4375
G03X-10.1424C-5.6321R.8073
G03X-8.978C-5.4618R.8073
G02X-7.6146C-5.9571R.4375
G03X-7.5788C-6.5634R.8073
G03X-6.5108C-6.2758R.8073
G02X-4.9712C-6.6185R.4375
G03X-4.6838C-7.2078R.8073
G03X-3.7588C-6.8155R.8073
G02X-2.1104C-6.9907R.4375
G03X-1.5844C-7.5372R.8073
G03X-.8426C-7.0573R.8073
G02X.8426C-7.0573R.4375
G03X1.5844C-7.5372R.8073
G03X2.1104C-6.9907R.8073
G02X3.7588C-6.8115R.4375
G03X4.6838C-7.2078R.8073
G03X4.9712C-6.6185R.8073
G02X6.5108C-6.2758R.4375
G03X7.5788C-6.5634R.8073
G03X7.6146C-5.9571R.8073
G02X8.978C-5.4618R.4375
G03X10.1424C-5.6321R.8073
G03X9.9254C-5.0354R.8073
G02X11.053C-4.4092R.4375
G03X12.2626C-4.4547R.8073
G03X11.8024C-3.8935R.8073
G02X12.645C-3.1638R.4375
G03X13.847C-3.0825R.8073
G03X13.1634C-2.5815R.8073
G02X13.6842C-1.7801R.4375
G03X14.8262C-1.5757R.8073
G03X13.9492C-1.1567R.8073
G02X14.1254C-.3187R.4375
G03X15.1574C0.R.8073
G40G1X16.F40.
G13.1
M09
G28U0.
G0Z5.
M40
M30
%

[theemudracer]

I figured it out guys, with the help of Bluesman.
It works good so far.



%
O0049(SPROCKET MACRO TEST)
/2M98P9999
#502=[#501+.1]
#503=-[23.4684-#500+1.5]
#504=-[23.4684+[#503-.145]]
M118M32
G40G28U0
G99G28B0

#5224=0.(G54 FOR C AXIS)
#528=30.(# OF SPROCKET TEETH)
#529=12.(DEGREE PER TOOTH)
#530=0.(TOOTH COUNTER)
#531=0.(INITIALIZING C INCRMENT TO 0.)
(ROUGHING END MILL)
G54G98
T0202
M43
G0C0.
G97S100M13
G0Z5.
X16.
WHILE[#530NE#528]DO1
G54G0C0.
G12.1
G42G1X15.1574C0.F60.
G03X14.1254C.3187R.8073
G02X13.9492C1.1567R.4375
G03X14.8262C1.5757R.8073
G40G1X15.5F120.
G13.1
#530=[#530+1.](TOOTH COUNTER)
#531=[#531+#529](INCREMENT C BY #529)
#5224=#531(INCREASING G54C0. TO CURRENT PO
END1
G0C0.
#5224=0.
M40
G28U0.
M30

[dpuch]

/2M98P9999
#502=[#501+.1]
#503=-[23.4684-#500+1.5]
#504=-[23.4684+[#503-.145]]

It looks like this isn't used at all.

May I suggest a few possible changes.

#528=30.(# OF SPROCKET TEETH)
#529=12.(DEGREE PER TOOTH)

Make Degree a the calculation of the other, UNLESS you intend to use this for non-360 deg sprockets. Insures you always have even spacing of x number of teeth.

#529=360/#528

Change

WHILE[#530NE#528]DO1

to

WHILE[#530LT#528]DO1

Catch it if somehow it is past #528 It should never happen, but keeps it from running an infinite loop if it does.

And a personal preference for readability

#531=[#531+#529](INCREMENT C BY #529)
#5224=#531(INCREASING G54C0. TO CURRENT PO

could be 1 line... <shrug>

Nice job working it out. If you make more gears besides this one, do you intend to make it a universal macro handling diameter, and perhaps changes in the profile?

Dale

[theemudracer]

It looks like this isn't used at all.

May I suggest a few possible changes.

#528=30.(# OF SPROCKET TEETH)
#529=12.(DEGREE PER TOOTH)

Make Degree a the calculation of the other, UNLESS you intend to use this for non-360 deg sprockets. Insures you always have even spacing of x number of teeth.

#529=360/#528

Change

WHILE[#530NE#528]DO1

to

WHILE[#530LT#528]DO1

Catch it if somehow it is past #528 It should never happen, but keeps it from running an infinite loop if it does.

And a personal preference for readability

#531=[#531+#529](INCREMENT C BY #529)
#5224=#531(INCREASING G54C0. TO CURRENT PO

could be 1 line... <shrug>

Nice job working it out. If you make more gears besides this one, do you intend to make it a universal macro handling diameter, and perhaps changes in the profile?

Dale

This was basically just a test prg., testing the basic theory,that has some needed changes as you pointed out. My intentions are to make it a 9000# prg. and use a G65 and load the variables from the main calling prg.

My intentions are also to figure out the math on how to create a tooth profile with different radi. and Diameter dimenisions. Now that will be challenge. For now I can just measure it out on Autocad and get my start and end points for the radius's.

[dpuch]

You will have to figure out the trig/math to create the points needed by hand, using the normal set of definitions you have for sprockets. Once you have that, your almost there.

If 1 tooth is 12 deg, the center of the middle arc is at 6, each end is at 6 +- the arc radius.... Not that simple to get it all, but... Draw it out with the lines needed to calculate the trig for each point and I think it will not take you too long. I don't know enough about it to help more than that

I did have fun drawing up a gear though.

Dale

[theemudracer]

yea this will be the hardest macro I have done yet as fas as all the trig that will be needed to complete the formula.

thanks
Jon

[dpuch]

One thing that may make it a little easier, center the macro at C0 instead of starting it there. That cuts the calcs needed in half.

Edit: err, actually it shouldn't matter... But looking at your X and C numbers, either they are wrong or I don't understand how the X and C programming should work. Is X=pos from center, and C=rotation in deg? I'm used to X Y Z...

Dale

[theemudracer]

One thing that may make it a little easier, center the macro at C0 instead of starting it there. That cuts the calcs needed in half.

Edit: err, actually it shouldn't matter... But looking at your X and C numbers, either they are wrong or I don't understand how the X and C programming should work. Is X=pos from center, and C=rotation in deg? I'm used to X Y Z...

Dale

LOL You dont understand how G12.1 works on a lathe... X is the diameter position from center and C is basically a "Y" dimension from center using radius instead of diameter. G12.1 basically turns Y axis needed movements into C axis degrees. I believe it does start at C0.

[dpuch]

LOL ok, I think I get it now... Funky lathe guys :rainfro: and their weird g-codes

Seriously, It seems my suggestion to start at C- center on C0 and finish with a mirrored C+ position would make things slightly easier then. There could be some reason you don't but that would be my suggestion.

Oh, and a way to automatically add rough/finish to the macro. If you can call cuttercomp for a different offset than the current one... Use an unused offset register and copy the current CC + your finish pass amount to that and use it for your rough pass.

Check these variable numbers for your machine, but I think they would be right.
#2430=[#[2400+#4120]+#[2600+#4120]]]+0.01 (Set T30 radius comp to current tools +0.01)
Rough= G42 D30 (T30 radius comp)
Finish= G42 D20 (T20 radius comp)

Dale

[theemudracer]

LOL ok, I think I get it now... Funky lathe guys :rainfro: and their weird g-codes

Seriously, It seems my suggestion to start at C- center on C0 and finish with a mirrored C+ position would make things slightly easier then. There could be some reason you don't but that would be my suggestion.

Oh, and a way to automatically add rough/finish to the macro. If you can call cuttercomp for a different offset than the current one... Use an unused offset register and copy the current CC + your finish pass amount to that and use it for your rough pass.

Check these variable numbers for your machine, but I think they would be right.
#2430=[#[2400+#4120]+#[2600+#4120]]]+0.01 (Set T30 radius comp to current tools +0.01)
Rough= G42 D30 (T30 radius comp)
Finish= G42 D20 (T20 radius comp)

Dale

I dont quite follow you because the way I see it, it does start at C0. ?????

G54G98
T0202
M43
G0C0.
G97S100M13
G0Z5.
X16.
WHILE[#530NE#528]DO1
G54G0C0.
G12.1
G42G1X15.1574C0.F60. (ON THIS LINE)
G03X14.1254C.3187R.8073
G02X13.9492C1.1567R.4375
G03X14.8262C1.5757R.8073
G40G1X15.5F120.
G13.1

Ok I just re-read your post and I think I understand now. The way I read the fanuc manual, when using G12.1 the control assumes the C-axis is at 0. when given the G12.1 command. I might try it your way to see thou. Just to make sure I am understanding you correctly this is what I think you are saying. Since I am starting at the peak of a tooth at C0. I would just be moving C0. to the middle of the Root radius. So the Peak of the teeth on either side of the Root raidius would be the same #, one + and one - #??

Is this what you are suggesting??

Roger on the cutter comp deal, thanks

[Integrex]

G12.1 is polar coordinate conversion in case you wanted to look into it.

Its kind of an axis substitution, Its main use is to simplify programming to make things easier to program by hand/edit by hand. A lot of time cam software spits out ginormous amounts of code in very small increments (due to the use of angular C coordinates in decimal degrees. Using the polar coordinate conversion the code is as previously mentioned programmed using xy coordinates (sort of) instead of X in linear and C in angular. it does replace the C coordinates with a "Y dimension".

kinda like how on mazatrol or other conversational controls you have the option of using XC or XY input to program live tooling.

[dpuch]

I would just be moving C0. to the middle of the Root radius. So the Peak of the teeth on either side of the Root raidius would be the same #, one + and one - #??

Yep, that is it. You could just start the tool at C0 then move it to the C- you needed to begin the tooth if G12.1 forces you to start at C0

Dale

[chunkymonkey]

depending on your machine capabilities, you might also try an external rotery broach. maybe somma or slater tools. it will save a ton of time if you can.

[Bluesman]

LOL You dont understand how G12.1 works on a lathe... X is the diameter position from center and C is basically a "Y" dimension from center using radius instead of diameter. G12.1 basically turns Y axis needed movements into C axis degrees. I believe it does start at C0.

Jon,
Did I ever send you that Fanuc Macro Programming manual I got from there class in Chicago(Bang Bang). It has some info in there that may be usefull. I can not remember if I ever sent it to you If you need it let me know

Bluesman

[theemudracer]

Jon,
Did I ever send you that Fanuc Macro Programming manual I got from there class in Chicago(Bang Bang). It has some info in there that may be usefull. I can not remember if I ever sent it to you If you need it let me know



Bluesman

Yes you did, I have learned alot from it.

Yep, that is it. You could just start the tool at C0 then move it to the C- you needed to begin the tooth if G12.1 forces you to start at C0

Dale

I still think I will do it my way. Im not going to do that wasted move on every tooth of a 30 tooth sprocket. thanks anyway and there is more than one way to skin a cat.HA HA

[chunkymonkey]

another option is to try a rotary broach (wobble broach). be sure to check your horsepower capabilities. you can find them at somma. a guy named Justin Gaerte proved it works very good and much much faster. 1-800-648-9918 is the work number over there.