[NorthCabGuy]

Hello All! New to this. Thanks for admitting me to group. I have had an lc4896 for about 15 years. I can’t get a bit that can last anymore than 4 sheets (4x8x5/8 2 sided melamine particle core)before burning up. I have tried all combinations of speeds and rpms (expensive and cheap bits as well)and can’t get the sweet spot. Anybody out there that has had this issue and resolved that can share? Thanks!

[joeavaerage]

Hi,
carbide or HSS?

Craig

- - - Updated - - -

Hi,
carbide or HSS?

Craig

[NorthCabGuy]

Hi,
carbide or HSS?

Craig

- - - Updated - - -

Hi,
carbide or HSS?

Craig

Hi, carbide

[ericscottf]

Silly question, any chance you're spinning it backwards? can you confirm spindle direction?
Eric

[routalot]

I'd hope for 8 -10 sheets but there are often foreign bodies within the chipboard.I've found stones,glass,screw heads and staples,and thats without the almost inevitable concrete dust.It happens because very often floor sweepings get dumped in the bin that gets taken to the chipboard factory.None of these pieces will do anything good for tool life.We don't have any hints about speeds and feeds to work with or if the normal practice is to use climb or conventional cutting.

[ericscottf]

those cutters are meant to cut wood, aluminum, etc. not cement board, glass, etc.
climb/conventional won't make much difference as far as cutter life, though there's a small argument that climb is better, it's not substantial.
Can you verify your cutter is spinning the correct direction?
Eric
Home | Armor CNC

[routalot]

I think if the rotation was backwards,the burning smell on the first sheet would be a clue.I found it just about essential to switch to straight PCD cutters a few years ago and would expect upwards of 50 sheets before wear intervenes-and thats with 2800 X2070 sheets.I've also found that conventional cuts leave less chipping with a straight cutter.Even PCD suffers if hardened screw heads are encountered,but with fragments of Corian or other plastics,it goes straight through.Some MFC is cleaner,from a contamination point of view, than other brands.

[ericscottf]

I just don't think you're going to have a good time routing through material with junk in it, no matter what you try. if you go too slow, you're wasting time and going to burn the wood. if you go at normal wood speeds, you're going to chip or break your cutters when you hit metal. You could also have a spark happen that catches your dust on fire and lights up your collector, that's a real bad day. Is there any chance you can get material that isn't made with surprises in it? This is not a problem I hear about a lot of people having....