INDEXABLE TOOLHOLDER DNMG 11

(OCT 2007)

JOB DONE MAN!!

I chose the dnmg 11 04 08 as Universal neutral economical tool ( I can machine right or left hand), because it is solid, arrow shaped, and not expensive to replace.

The first thing to do is to get from ebay a box of good inserts as KENNAMETAL or SANDVIK or similar item.

I have fount this box of DNMG 11 04 08 few months ago and they had a good rest until two days ago when i started to make this insert holder.

KT 315 grade is a good grade and FF means Finishing. I am gonna use this insert for medium to finish machining right or left hand.

As usual I have installed the rotary table on the mill to get a "rotative" surface with precise angles movements.

on top of the rotary table I have mounted the big vise where I have clamped the 16 * 16 mm square bar.

The bar needs to be clamped with a 10° inclination because the negative shape of the DNMG insert needs a clearance angle to work.

According to my bible(s) which are sandvik coromant catalog and taegutek catalog , 10 ° is perfect angle for the Neutral DNMG insert.

once that the bar is clamped it i important to trim perfectly the rotary table moving the table wheel until the 90° position is achieved.

the laser center finder is used to get the perfect dead center of the 16*16 bar.

first step of machining is to make the central slot with a small 3mm endmil

Moving the rotary table wheel 6 full times + 18 holes I get a perfect 27,5° angle from ZERO position , that allow me to machine the first front arrow shape side.

Hitachi HSCo rough mill is the way of doing this!!! fast!!!

6and 18holes right to get ZERO again, plus another 6 and 18 right I get 27,5° right, which is 55° total from the previous cut.

then I turned at 0° the table and I removed the insert area material.

27,5 right and then 27,5 left to get the rear triangle sides.... (sorry I didn't Made any photos, I was just to focused on doing the job perfectly!!!)

next step is to finish the main front sides with a cobalt mill, at 50 m/min speed

the insert sitting is made. now it is time of drilling and tapping the M3,5 thread

For the strange M3,5 thread I bought a brand new tap, and 2,9mm drill bit

tapping....

right, the job is done. to complete the perfection I can file some edges with manual operation....

and this is all!! my new SDNNN toolholder is ready to make chips!

The main screw is a SANDVIK screw, (spare part number 5513 020-01).

Don't use any stupid crap quality screw. order a set of sandvik screws which are strong and well made. these screws costs only few bucks each.

fantastic!!! on the lathe!!, another ALGRA toolholder is used!!