INDEXABLE TOOLHOLDER for THREADING

(2007)

JOB DONE MAN!!

After few days studying the SANDVIK catalogue I understood that the angle of toolhead must be -10 degrees, to balance the threading insert which is 10 degrees nose up.. Sandvik original toolholders have a -10 angle..... my one will be the same.

I started from a 200cm 16 * 16 mild steel rod, cutting 125 mm off and parting them perfectly with the end mill, milling on both ends.. checking that vice was perfectly at 90 °

now the sides are 90° true at 0.01 precision....

next step , place insert and holder on the measuring table to make two lines of where the insert will b seated..

back on the mil for the first 10° action.... a full flat surface.

I have made the corner bore as first piece then....

then, few minutes to calibrate the vice exactly at 60° for the first cut.... again with 0.01 precision..

and then machining the back side of sitting, plus main central area.

back to align the vice for another angle now...

to complete front corner and complete the sitting...  the insert is getting a new HOME to rest and work!!

I made a mark of center of insert with a pen....

and after the alignment with the laser center finder, I have drilled the bore for M4 thread..

DANGER   DANGER  DANGER    DANGER   DANGER  DANGER 

finding the screw drilling point is the most difficult and important step. I think that a good thing is to center the point with the laser and then move 0.05 back and right (towards the corner of two sittings walls) to make the screw "pulling" the insert against the two sitting sides....

DANGER   DANGER  DANGER    DANGER   DANGER  DANGER

M4 thread done ....

now I can use my unimat 3 for a fast modify on a M4 allen head screw.....

toolholder completed....

closer view....

now it is time to TEST it!!!!

and this is the result!!!!!   (GOOD , best thread ever MADE !!!!!)