In reply your email,
I’d like to confirm with your understanding in story of this matter.
1. TBKK did machining following the previous drawing.
2. TBKK found that the actual part material was exceeded 0.5mm.
3. MTA agreed as TBKK purposed to added machining to remove the exceeding material.
4. TBKK has informed to MTA that process cost will be increased due process is added.
5. TBKK has started to added machining to remove exceeding material since 13/May/16(delivery).
***Hereafter it will be called an improvement part
6. MTA(MHI) to revise the drawing based on shape of an improvement part shape
By MTA has known well about shape of improvement part before agreeing in No.3
7. MHI(MTA) revised the drawing by adding dimension of machining and deleted note of
“MAX 0.5 MATERIAL IS ALLOWED….”
8. While MTA knows well that an improvement part, the difference plane will be appeared by adding machining
to remove exceeding material.
So, Could you please kindly consider to revise drawing again? because an improvement part(existing part) is produced based on process which agreed with MTA.
For tool mark acceptable by roughness control.
I’d like to inform you that it is impossible because difference of machining plane and roughness is different.