About using tool cutter with 12mm to cut 30mm big width keyway which down width is narrower , Hereby our Engineer reply it as below: :
If we use 12mm cutter cut 30mm keyway by 3 cuts , The keyway width at down is narrower , You said that Top width is good , So controller X axis position is no problem.
The possible reason is :
- The slotting bar rigid is not enough , normal rigid Ratio is 3-5 , For example Diameter is 40 , the Length is 120-200mm , Your keyway width is 200mm , Slotting bar out length need min.230-250. So your slotting bar diameter at least should be 50mm , If the slotting bar too weak (flexible) , The slotting bar at top OK. but it bend at bottom Period .
- Besides, you also need to check the perpendicularity between table surface and Ram slide well.
- The third possible reason is you don’t add support or fixing fixture such as fixing ring to let work-piece no moving during cutter cut at bottom range , Because you just clamp work-piece at top but lower part don’t fix , While slotting tool forced cutting at lower range , the work-piece may be escape (move out) , So happen the problem.