On my TL-1, when I try to do a chamfer with the intuitive programming the size is too big. This applies to both ID and OD cuts. When I first got my TL-1 about two years ago I somehow figured out how to trick the control into giving me the correct size of chamfer. In the operators manual, there are two pages with "Tool Radius and Angle Chart" (p 73 and 75 in the June 2008 online manual), one for 1/32" tnr and 1/64" tnr. These charts are used with other pages in the manual in showing how to do tool nose radius calculations on chamfers.
It took me a while to remember how I did this as I didn't use my lathe at all for about 1.5 years. When I tried doing my first sample chamfer last week I wanted a .025" chamfer. As close as I could estimate it was measuring more like .040". The tool I was using had a .0312" radius. I then mostly remembered what I figured out in early 2008. I used the tables in the manual and took the number from the Zc longitudinal column for a 45deg angle (.0183" for 1/32" tnr and .0092 for 1/64" tnr) and subtracted it from my desired chamfer. So, instead of putting .025" in IPS for my chamfer size, I put .0067". That resulted in my correct .025" chamfer on the part. I tried this with other tool nose radius tools (.0156" and .007"). I had to scale the chart number for the .007 tool (.0041" offset), but they both worked. I haven't tried a chamfer smaller than the compensation number from the charts. Who knows what that would do...
When I use Visual Quick Code the chamfers are correct. Problem with VQC is that chamfers are part of a bigger operation and I just want a chamfer. It is just the "Intuitive" programming package gives the faulty results.
I don't know why it works this way, but it does and with consistent results. Maybe it is just my machine (early 2008 TL-1). But, you may be getting incorrect chamfers and not know it. If you do big chamfers this little offset may get lost in the noise. But, if you are like me and are just trying to break an edge with a small .010" chamfer, then it is noticeable when the chamfer is 2-3x larger.
I've got the correct tool nose radius in both my offsets page and on the IPS screen. Nothing in wear offsets.
Any idea why my lathe works this way? Any way of fixing it? I'd really like to just plug numbers into IPS and run...