SFA

Hi Everyone,

I using both the blue and white apexx milling bit. I noticed my blue bit is wearing out on the top. Not sure how this is happening since its thinner than the bit, and should not be touching anything. the picture shows a brand new blue bit, next to a used blue bit. Has anybody seen this before and why it's happening?

I have it happen to the ones i use. not that severe. Usually it happens on the last pass of a vanity sink hole. the cut out will tend to float around once it is cut free and rub the shaft of the bit.

ogm1 wrote: ↑

Thu Nov 12, 2020 12:56 pm

I have it happen to the ones i use. not that severe. Usually it happens on the last pass of a vanity sink hole. the cut out will tend to float around once it is cut free and rub the shaft of the bit.
[

Oh wow, I never thought of that. that makes sense. So do all your bits wear like that? or its just random?

Thanks

It happens the most to us when doing electrical outlets in full height backsplash or waterfall ends as well.
For those we now set the depth just shy of going all the way through and then just knock the piece out after.

BellaTerra wrote: ↑

Fri Nov 13, 2020 6:47 am

It happens the most to us when doing electrical outlets in full height backsplash or waterfall ends as well.
For those we now set the depth just shy of going all the way through and then just knock the piece out after.
[

How much do you leave on, before you knock it through? do you think it's from the floating cutting out pieces too?

Vinny wrote: ↑

Sat Nov 14, 2020 7:06 am

BellaTerra wrote: ↑

Fri Nov 13, 2020 6:47 am

It happens the most to us when doing electrical outlets in full height backsplash or waterfall ends as well.
For those we now set the depth just shy of going all the way through and then just knock the piece out after.
[

How much do you leave on, before you knock it through? do you think it's from the floating cutting out pieces too?
[

I set the depth at 1.05” (26mm)
The small piece that is left floats freely in the hole and binds up.

ogm1 wrote: ↑

Thu Nov 12, 2020 12:56 pm

I have it happen to the ones i use. not that severe. Usually it happens on the last pass of a vanity sink hole. the cut out will tend to float around once it is cut free and rub the shaft of the bit.
[

Is there a particular preference to using the replaceable tip bits other than cost? A full finger bit probably does not have this issue. If its a cost thing, then buck up an buy the better tooling. What kind of cost savings are you really achieving with this? A lot of shops spend 10's or 100's of thousands of $$ on a CNC saw only to save $50-$75 vs buying a full finger bit?

Maybe there is something I am missing here.

Rick Graff.

Hi Rick,

Omag says I can't run a finger bit, trust me I would like to run a finger bit, but they say the machine mills in a diagonal and not a true step down and cut sideways. If you know someone that can make this Omag machine work with a finger bit please let me know?

Vinny wrote: ↑

Tue Nov 24, 2020 12:51 pm

Omag says....the machine mills in a diagonal and not a true step down and cut sideways.
[

I am not familiar with Omag, maybe someone else here who has one can give some insight on using a milling/finger bit on it.

Seems a little odd that it doesn't cut sideways when the saw blade cuts sideways; maybe its in their post processor that generates the Gcode for it.

The beauty of finger bits is they can go all the way through the material. So even if Omag says well ours isn't exactly cutting sideways, most finger bits hold up just fine step cutting to all to full depth of the bit.

Again, I am not familiar with Omag machines; however it might be worth the effort to get a bit and try it on some scrap stone to see what it does. It would not be the first time and end user tried something that wasn't exactly what the manufacturer said.

You could keep the RPMs in the right range and just slow down the feed rate on the bit or just barely take material off then work your way up from there.

Good luck!

Rick Graff