Recently, I am having an issue using my Automatic Tool Presetter. When I set my Tool#1 (55 degree turning tool) and then set my Tool #2 (35 Degree turning tool). I have to offset my Tool #1 about .060" wear to match Tool #2. I have cleared all of my offsets, I have cleared all of my wear offsets to zero. I have verified using magnetic base that my two tools have a difference of .030" when commanded to go to same X position. All of my other 10 tools match my Tool #2. It appears Tool #1 is culprit. Any suggestions?
2 Likes
I did some more troubleshooting. So instead of using the ATP, I set the tools manually. Now when I run a simple face and turn. Both my tool #1 and #2 are synced… When I use the probe, I have a .030" difference, causing a .060" diameter change. I know I am doing something basically wrong, two weeks ago, it was working fine.
2 Likes
Is something else coming in contact with your automatic tool setter when the turret is in position one? maybe pushing the tool setter arm a little before the tool touches the probe. possibly the tool holder itself just before cutting tip contact.
3 Likes
I have used the probe both manual and automatic setting during probe operation. It has been very repeatable for all tools. I have reset all the tools maybe 5 times so far. Probably reset tool #1 at least 10 times and get the same X offset reading. I wiggled the probe by hand in case it was dirty or sticking, it appears to be operating properly. I will probably give it another go this morning when I return to school.
2 Likes
Is the probe in this machine the 4 sided button style if so are both touching off on the same side which from what I’m gathering they are since both turn O.D. Reason in asking is if they touched off on different sides the side Tool 1 touches off on could be out and needing to be offset.
Been a while since i was on a lathe
3 Likes
I used tip #3 for both tools. Today, I will have the students check the tool and make sure they did not change out shims or something that might change the tool height of the tool.
2 Likes
Well, one of my students changed out a spacer to position my 3/4 shank tool to a 1" shank tool. The spacer was .005" short of .250 thick. Swapped the legs of the spacer, and now my tools are all synced up… It was something very simple and basic. I did not know they had taken the spacer out. 
2 Likes
Are those something you made in class or purchased?
We made in class. one spacer had .245" thick leg out of 24 spacers made, of course the one spacer that was undersize was the one that was swapped
2 Likes
I had a problem with ID bore bars - it was always off on X by .009 - I did calibration procedure a lot especially after arm got crashed a couple of times. (tool change over arm or using auto instead of manual mode). I had to bend the arm back in place so I got real good at recalibration. Plus we did lose the breakaway link once as well.
anyway - on that one calibration on inside tools would be hitting bottom of probe square - I have to add in for the .009 and then they came out dead on.
I suspect on my ST 10 that my tools are not on center line - always leaves a nub on front - I may have to modify tool shanks a little to get on center - I think it needs a .005 -.010 shim.
1 Like
I had to do opposite - I wanted a very large cutoff tool to do 4.00 diameter stock and all I could get was 1.00 shank - so we manual machined shank to make it .750.
1 Like
actually yesterday we pulled all tools and did a coolant change over - clean the machine up a bit
1 Like