Hi Everyone,
Hopefully someone can shine some light on this threading business.
See attached photo. Yikes.
This is my practice run on 1” round 4140 hardened alloy I just purchased.
I tried the 4140 annealed and had much the same results, threads pulling.
In the setup I have currently Arthur R. Warner HSS insert TNMC. I have EDGE level
to adjust the height. I tried moving the insert up and down with not much change.
Both inserts are new. Shaft runs nice and true 0.0003” and everything is tight.
In the picture is a second insert I tried with TPMC (carbide gold color), no difference.
The speed tried is 65 and 185, which may be the culprit, but since the thread on the final product is 15mm, length of the thread is 16mm and collar beside it is 25mm, I am paranoid going any faster of fear crashing the tool into the collar. (not in the picture as I am just practicing).
I was even thinking if I need to ran faster to make the shaft where the collar should be, say a 16mm so I will not crash it, and then after the threading if successful press the collar onto the 16mm shaft. Unless of course there is another technique, like cutting threads away from the collar with upside down insert.
I work mostly with stainless and never run into this to be a bother. So obviously, I am just not capable to machine 4140. I am ashamed of this embarrassing picture.
Hopefully someone can shine some light on this threading business.
See attached photo. Yikes.
This is my practice run on 1” round 4140 hardened alloy I just purchased.
I tried the 4140 annealed and had much the same results, threads pulling.
In the setup I have currently Arthur R. Warner HSS insert TNMC. I have EDGE level
to adjust the height. I tried moving the insert up and down with not much change.
Both inserts are new. Shaft runs nice and true 0.0003” and everything is tight.
In the picture is a second insert I tried with TPMC (carbide gold color), no difference.
The speed tried is 65 and 185, which may be the culprit, but since the thread on the final product is 15mm, length of the thread is 16mm and collar beside it is 25mm, I am paranoid going any faster of fear crashing the tool into the collar. (not in the picture as I am just practicing).
I was even thinking if I need to ran faster to make the shaft where the collar should be, say a 16mm so I will not crash it, and then after the threading if successful press the collar onto the 16mm shaft. Unless of course there is another technique, like cutting threads away from the collar with upside down insert.
I work mostly with stainless and never run into this to be a bother. So obviously, I am just not capable to machine 4140. I am ashamed of this embarrassing picture.