Introduction to Glass

[tyskkvinna]

Hey all - long time lurker.

I have a CNC Mill which I use normally for engraving on wood, metal and plastics. In plastic usually nylon and UHMW. I want to start engraving on glass - plain glass as well as mirrors.

I read through all the old stuff here and found some information. But the threads are all quite old and not "quite" what I was looking for.

Any tips and tricks I should know? I assume I need to get some diamond tip bits for working with it. Have not gotten them yet. I'm just interested in engraving them, possibly cutting relatively simple holes.. not shaping the pieces. They're going to go in frames when I'm done.

Thanks for any insight!

[ssoptical]

I have been working with glass on a cnc for 30 years.
I have been waiting for someone to ask.
any questions or problems you might have let me know.
David.

[tyskkvinna]

thank you!

I am going to be ordering the bits for it sometime this week. can you give any suggestions? ones that work better than others? I don't really care where I get them, but I have a feeling I want more industrial ones than just dremel bits.

I am mostly going to be engraving and detailing images. Pretty small, think reading handwriting and such.

[ssoptical]

for routing things i would suggest metal plated diamond,
we buy ours from a company called cdt their on the web under industrial diamond cutting tools.
David.

[nilesh1701]

I have been working with glass on a cnc for 30 years.
I have been waiting for someone to ask.
any questions or problems you might have let me know.
David.

Hi david
I have glass cnc machine and i dont know how to do milling on glass. I tried but its start chipping when the milling cutter coming out from the glass so please can you give me some tips, how to mill corner cutout without chipping.

Thanks
Nilesh




EXPS Redirector

[ssoptical]

let me know what rpm' diamond grit size' and feed speed you are planning on using.

[nilesh1701]

let me know what rpm' diamond grit size' and feed speed you are planning on using.

Hi
I am using finger diamond bit from italy but i dont know about grit size but its surface finish is rough and i am using 6000 rpm and feed is 70.

One more thing is i dont have internal watering in my spindle i am using external water does it effect on milling.

Thanks and appreciate for your help
Nilesh

[nilesh1701]

let me know what rpm' diamond grit size' and feed speed you are planning on using.

can u please reply me.
Thanks
Nilesh

[ssoptical]

one thing you is to add a good water based coolant and plenty of it.
the 70 ? is it inches , way to fast try 3 inches a minute feed rate.
and external coolant is what i use unless core drilling holes.

[nilesh1701]

one thing you is to add a good water based coolant and plenty of it.
the 70 ? is it inches , way to fast try 3 inches a minute feed rate.
and external coolant is what i use unless core drilling holes.

Thanks for reply. one more thing is I want to know the polishing edges of the glass. I am using BD polishing wheel and can u please tell me what compensation I have to use means how how many microns I have to go in per mm when using polishing.

[ssoptical]

u really need a hard wool polishing tool to polish glass and run the spindle speed
at 340 rpm and lots of polish and feed at 1" pm.
make your tool size about .003" smaller to start out with, to much friction or heat will cause the glass to crack.

[nilesh1701]

[QUOTE=ssoptical;1185319]u really need a hard wool polishing tool to polish glass and run the spindle speed
at 340 rpm and lots of polish and feed at 1" pm.
make your tool size about .003" smaller to start out with, to much friction or heat will cause the glass to crack.[/QUOT

is it 3400 rpm? can u please give more tips to polish glass on cnc.
such as i told u before i am using BD wheels.
Do i need to run BD wheel first and then hard wool polish tool?
also different thickness glass have different polishing compensation