[elbruz]

Hi all.
My problem is with end mills while surface milling.
As you will see from the attached pictures, after milling, there is RIDGES between the borders of each passes.
Ok, i do not expect a perfect shiny surface, but at least it could be flat.
When i place an knife edge square, i can see that surface is not flat.
What could be my mistake ?

Any suggestions are appreciated.
Thnx.

[victorofga]

first off

toolmarks can be observed with any milling machine

they can not be eliminated fully..

before cnc machines fly cutters were used in some cases making esthetically better looking..

the thumbrule, edges are never working same.. the multiple edges yielding when you work with the flutes and not with the tooltip

================================================== ==

looking for your picture, and try to imagine what size endmill you use and what size the machine column, easy to figure that endmill well oversized for your machine..
when you engage and feed the whole machine flexing..
also can not help if edges are not ground back at least 5 deg.. then machine ""riding"" on the bit..

either way try to use smaller dia tool or, try to use one edged tools..

but again fully eliminating the sense and visibility of those bridges not possible..
only minimizing..

[keebler303]

First step is to make sure your spindle is PERFECTLY perpendicular to your table. This process is called "tramming". Google "how to tram a mill" or similar. This is critical.

Poor quality tools will have variation in flute heights, as Victor mentioned. A small corner radius will help to prevent the corners from scratching so much and give you a smoother finish. You can also try to overlap your passes more.

[The Wolf!]

try overlapping more, and you could try going the same direction. also try 3 or 2 flute end mill.

[elbruz]

Yes, i have been tramming the mill since last two weeks. There has been some minor error. And finally i managed to reduced to 0,02-0,03 mm range. But, when i tighten the upper lock screw of the head, just 0,03 mm more deflection occurs. I think it is a comman issue in just kind of mills. I do not want to suck in this issue in mind and i want to enjoy the milling. Otherwise, while chasing the ZERO , life will gone out )..

Anyway, i will post the new surface finishes soonest.

Wishes.

[sudsy]

Try milling at 90 degrees to what you are at the moment and see if you get the same. If you do you have some wear somewhere that needs to be adjusted out. Also as mentioned above check your spindle and make sure it is perfectly square to the table