Ed,
The threads are made out of a separate piece of 4340N steel, TIG welded onto the 4130N pipe, and then heat treated afterwards. I will probably QT the entire thing according to 4130, and then QT the 4340 threads separately afterwards to achieve greater edge retention.
Hi all,
So I am trying to replicate a tool known as an increment borer. It is a hollow shaft with hollow cutting threads on one end meant to screw into live wood and extract a 16"-long core sample. I have been told by their engineers that the borer is made out of Uddeholm Rigor (XW-10) steel...
Here is the updated table based on your recommendations
It appears that quenching 4130 at 1575°F and tempering it at 400°F would achieve similar torque values to the actual material used, AISI A2. The manufactures of the increment borer claim that it can withstand up to 90 ft-lbs of torque...
Thanks retired13. This is what I came up with:
I am trying to replicate an increment tree borer. Note that I was told the A2 tool steel hardened to 48 HRC is the material of the actual increment borers, which have been field-tested to 90ft-lbs.
STrctPono,
I come from an electrical engineering background, so unfortunately I am at a pretty basic level when it comes to mechanical engineering. Could you explain how to calculate the max permissible torque the pipe can withstand without permanent distortion and/or breakage? I understand that...
retired13,
This is correct, I am using the formula Tmax = (π/16)τmax(D4 - d4)/D, but do not know the value of either Tmax or τmax. Do you know how I might go about calculating τmax given the dimensions of my pipe and its material? It is essentially a part of a hollow auger that is hand-screwed...
Hi all,
Do you know how I might go about calculating the maximum shear stress of a 16"-long, 0.375" OD x 0.259" ID Q&T 4130 tube? It has a yield strength of 1110MPa and ultimate tensile strength of 1145MPa. I am trying to calculate the maximum permissible torque that can be applied before...
