- Joined
- Dec 18, 2022
- Messages
- 2,623
So, I wanted to fine tune the tram on the head of my mill. I loosened the three bolt, adjusted it then as I tightened the lower bolt, M16x2.0 when I hit 20 Ft/Lbs of torque I heard a ting... Me: "what was that? did you hear that?" Wife: "yeah, What was that?.." I reached up under the head after realizing the bolt was no longer turning and pulled the piece of it out attached to the nut... Wife: "thats not suppose to come out".... 
... Me: "Nope, not like that"... ....
Wife: "Now what?"... Me: "we have to take it apart to replace that"...
What broke and the surprising way it broke:
What it is suppose to look like...
My wife said, "how long will it take to get the part?" and my answer was "I have 4140, I'll make a new part".. I have to admit I forgot to take a picture of the new bolt but it looked a great deal better than the one in the photo. Take a look at the one in the photo, see the dish in the end of the bolt? Additionally there should have been 2 long bolts and 1 short but the one on the right side was a short as was the one on the bottom which broke, the one on the right, when tight, didn't fully engage all of the threads in the nut, there should have been at least 2 threads above the nut.
With all of this said, any of you Precision Mathews guys feel like chiming in on this? that break is like this bolt was 2 parts not one, clean, not a shear. Take a close look at the head it appears as though the case hardening pealed away from a base material, very odd....
PM940 guys, be aware if you are tramming or otherwise adjusting your machines....
... Me: "Nope, not like that"... ....Wife: "Now what?"... Me: "we have to take it apart to replace that"...
What broke and the surprising way it broke:
What it is suppose to look like...
My wife said, "how long will it take to get the part?" and my answer was "I have 4140, I'll make a new part".. I have to admit I forgot to take a picture of the new bolt but it looked a great deal better than the one in the photo. Take a look at the one in the photo, see the dish in the end of the bolt? Additionally there should have been 2 long bolts and 1 short but the one on the right side was a short as was the one on the bottom which broke, the one on the right, when tight, didn't fully engage all of the threads in the nut, there should have been at least 2 threads above the nut.
With all of this said, any of you Precision Mathews guys feel like chiming in on this? that break is like this bolt was 2 parts not one, clean, not a shear. Take a close look at the head it appears as though the case hardening pealed away from a base material, very odd....
PM940 guys, be aware if you are tramming or otherwise adjusting your machines....
