fanuc robodrill

[Wally]

Help? We just bought a new machine and are braking spindels. Had the rep. and others in and can`t find the answer why. Not pushing the "R`s" to the max and cutting aluminum. Anyone ever run across this? The machine is under warrenty but would still like to find an answer. Thanks for any help you may have to offer.

[Scott Reiner]

Spindel Chiller? Are the in & out the correct way around? Is the unit functioning correctly?

[Fig sign]

What S do u use .

If you work on max speed most of time and the speed is more then 8000 rev/min and U have unbalanced tooling (the worst case you have tooling with a bolt closing from side ) it can ruin your spindel prelly fast .

Also on cheap machines without through spindel flood cooling the flood can get to the spindel bearings so if your taper puling part has a hole in the middle for cooling the water can get through it and it will kill your bearings fast ,bloody fast !

 

Just throwing a thought

[Wally]

thanks for the imput - i`ll check and see.

[stonker]

I work with Wally, heres what happened. 20,000 rpm machine BT30 taper runing a 3/8 carb em at 12000 rpms 50 ipm full dia cut 5/16 deep into 6061-T6. The alum loaded up on cutter and instead of breaking the endmill or machine stopping the pullstud broke causing the holder to come out of spindle enough to wedge itself between fixture and inside of spindle which is still rotating 12,000 rpms. Needless to say there is alot of gauling to the inside of the taper. The repair man thinks its a bad pullstud but now I'm afraid to run same program.

[Fig sign]

It may be chips on the taper holder .Those opened cheap Umbrella -looking tool changers and chips on tapers I saw this happenin` a lot .

And so chip on the taper ,the tool as a result rocks and beats one fluet bigger . IS it possible ?!?

Why it was not pulled out ?!?

It depends of teh tool type .

There are tools pulling out and pushin` in

 

HTH

ITHH

[iowajim62]

Wally,Stonker,

 

You are pushin pretty hard at 5/16 deep with that machine. .06 depth cuts at 250 ipm would equal same mat'l removal rate as .3125 depth at 50ipm.

 

Another thing get the drawbar pressure checked.

Have seen broken pullstuds before but not on that little dude. (we have 2 of em)

 

HTH

[stonker]

iowajim62,

That is exactly what we are looking to do next, lighter faster cuts. We have a Brother machine that has been running the same parts with out a problem. It has very simular specs as the Robodrill. The boys on the floor took the Brother program and make the minor changes to run on the Robodrill. Learning this new concept the hard way.