Threading on turning center

[dholt]

Anybody have extensive knowledge on single point threading on turning center? I have some questions about acceleration and deceleration factor effecting thread pitch and thread minor.????

[M-man]

Check your manual, there you should find the factors and formula for calculating the distance to achive the right pitch.

[CNCRim]

What is control you have? If it is Fanuc, I think all G32(or G34) are standard but you can also use G92 as well for single point. The calculation for the pitch is thead per inche(1/number of thread), and whatever the RPM you put in will be Okay the control will take care the rest just don't too high(not recommend).

T0101
G96S500M3
G0X.5Z.1
G92X.48Z-.5E.0312(Z is the depth, E is the pitch)
X.47
X.46
X.45S230(reduce RPM from 500 to 230)
G0Z.3(cancel G92)

[M-man]

Originally Posted by newtexas2006 What is control you have? If it is Fanuc, I think all G32(or G34) are standard but you can also use G92 as well for single point. The calculation for the pitch is thead per inche(1/number of thread), and whatever the RPM you put in will be Okay the control will take care the rest just don't too high(not recommend). T0101 G96S500M3 G0X.5Z.1 G92X.48Z-.5E.0312(Z is the depth, E is the pitch) X.47 X.46 X.45S230(reduce RPM from 500 to 230) G0Z.3(cancel G92)

WHat is high rmp while threading?4000-5000 RMP ? I make alot of threads with speeds around 3000 rmp and that is alomost the speed limit on the machine.

[Bear]

WOW!
Ive been doing it wrong all this time.
Doesent matter what kind of machine or controller,
Ill give this a try!
Bear
ps anyone need a brokedown machine ?

[Garage Shop]

Originally Posted by M-man WHat is high rmp while threading?4000-5000 RMP ? I make alot of threads with speeds around 3000 rmp and that is alomost the speed limit on the machine.

Threading at 5000 rpm??? DAMN. My machine would alarm because I dont think it even rapids fast enough to cut that thread.

I usually stay around the 60-500 max.

[timlkallam]

This will help it has a chart that tell you where to start depending on the rpm.

http://ctemag.com/pdf/0210-laydown.pdf

[M-man]

Originally Posted by Garage Shop Threading at 5000 rpm??? DAMN. My machine would alarm because I dont think it even rapids fast enough to cut that thread. I usually stay around the 60-500 max.

524 rmp cutting 3" pipethread in stainless .
4338 rmp cutting 3/8 UNC in same material..(uses 3500rmp max speed)
Of course you have to use a correct start point so the z axis will have time to accelerate to the right feed.

[NC Cams]

Am I wrong in assuming that the optimum RPM when you start to feed in the tool to cut will ultimately depned on:

A. the diameter of the part being cut

and

B. the optimum surface footage that the material wants to be cut at??

When/if you run out of rpm potential for the spindle, at that point the surface finish will start to suffer.

[BMackinnon]

Originally Posted by NC Cams Am I wrong in assuming that the optimum RPM when you start to feed in the tool to cut will ultimately depned on: A. the diameter of the part being cut and B. the optimum surface footage that the material wants to be cut at?? When/if you run out of rpm potential for the spindle, at that point the surface finish will start to suffer.

not necesarly true when threading ... it is faster to run threads at high speeds with a good amount for a depth of cut or number of cuts compared to what the stanards/formuals call out. The SFM dosent matter as much as it would if you were turing/boring the OD/ID since you are not worrying about chip break or burning the tool/material cause you are not taking off that much at a time. You'll break/chip the insert before you burn it up if your depths are not right.

[lathe guy]

I like the G76 threading cycle. Never have a problem with this.

[lathe guy]

G76 X0.96 Z-3.5 K470(thread hight) I( for taper) D100(depth of first cut) F0.062 A60. Important, you must use G97 for spindle speed.