Summa T Series are powerful, accurate TANGENTIAL roll plotters, offset compensation does not apply unless being in drag mode in which case they can use the same blade as the Summa D Series in the drag blade holder supplied with the machines.
Drag mode is less accurate than tangential mode but it can be a useful emergency standby in rare cases of tangential head malfunction.
Blade type SNV is the type most commonly used.
We also make many other types - some examples are shown above
We probably make more blade types than any other manufacturer. To list all variants here is more likely to be confusing than constructive.