Pics help. Then there is the obvious, if the blanks failed along the glue line, then it's probably the glue, the glue up technique or a combination of each. How were glue surfaces prepped? What type of glue? Glued with the grain or end grain? Were banks glued under pressure? How long did pieces cure before further processing? Where was glue line in relation to bore hole for brass tube? Und so weiter. Was drill bit sharp and/or did blank heat up excessively when drilled? Was gouge/or whatever tool sharp. What was the angle of the cutting tool in relation to the bore axis of the blank? What was turning speed. Was turning done using mandrel, and if so was mandrel heavily torqued.
Did blanks blow up or just split apart? Lots of possibilities. We really need more info to do a proper root cause analysis. And, no this is no some smart alec response to your request, just trying to put all in a better position to assist you.