PriddyShiddy
Cast Iron
- Joined
- Mar 1, 2011
- Location
- anaheim, ca
I have a 2 year old TM2P with less than 1,600 hours on it. The last 2 months I have been running SMALL tools so the spindle has been on 6K rpm for 8-12 hours a day 6 days a week. I go to run some normal parts and finish is BAD all the way around the part and from facing.
HFO comes out today and tests the drawbar which was fine then we pull the timing belt off and find a nice deep groove in both pulleys and the belt nice and furry. Seems like a logical possibility of a cause so I say "Okay, order me up the pulleys and a new belt".
Quote: $6,700 (including labor)
WTF!?
"We can't change the pulleys, you have to buy new spindle AND new motor". He explains as if it wasn't the dumbest thing I have heard in years. He said they heat & press the pulleys on so there is no way to get them off without damaging the spindle and/or the motor in the process.
I am beside myself at the complete insanity of this. I have worked on CNCs and many other machines and I have never heard of permanently mounting a WEAR ITEM to a spindle/pulley. Not to mention: how the hell did a rubber timing belt wear out 2 steel pulleys in less than 1,600 hours?! That's less than 2hr/day of use since I bought this thing new.
Did they install it WAY to tight?
Is it because they have a 21mm belt on 40mm pulleys?
Why is there a 21mm belt on a pulley twice it's size??
He sold me a new belt to try and it is completely different brand. Old one is a Mitsubishi Giga Torque GX and the new one is Gates Poly Chain GT still 21mm.
Should I try a 30mm on this 40mm set up instead to get it up over the wear marks?
Phone just died, but I will post pic of the strange finish in a few minutes. I am stumped. Going to finish cleaning the masses of goo and crap that the fan sucks up from the open column and deposited on everything in the spindle cabinet, get the new belt on and take some test cuts. I wondering if the coolant that gets sucked up acted as a lapping compound and increased the wear on the pulleys maybe.
HFO comes out today and tests the drawbar which was fine then we pull the timing belt off and find a nice deep groove in both pulleys and the belt nice and furry. Seems like a logical possibility of a cause so I say "Okay, order me up the pulleys and a new belt".
Quote: $6,700 (including labor)
WTF!?
"We can't change the pulleys, you have to buy new spindle AND new motor". He explains as if it wasn't the dumbest thing I have heard in years. He said they heat & press the pulleys on so there is no way to get them off without damaging the spindle and/or the motor in the process.
I am beside myself at the complete insanity of this. I have worked on CNCs and many other machines and I have never heard of permanently mounting a WEAR ITEM to a spindle/pulley. Not to mention: how the hell did a rubber timing belt wear out 2 steel pulleys in less than 1,600 hours?! That's less than 2hr/day of use since I bought this thing new.
Did they install it WAY to tight?
Is it because they have a 21mm belt on 40mm pulleys?
Why is there a 21mm belt on a pulley twice it's size??
He sold me a new belt to try and it is completely different brand. Old one is a Mitsubishi Giga Torque GX and the new one is Gates Poly Chain GT still 21mm.
Should I try a 30mm on this 40mm set up instead to get it up over the wear marks?
Phone just died, but I will post pic of the strange finish in a few minutes. I am stumped. Going to finish cleaning the masses of goo and crap that the fan sucks up from the open column and deposited on everything in the spindle cabinet, get the new belt on and take some test cuts. I wondering if the coolant that gets sucked up acted as a lapping compound and increased the wear on the pulleys maybe.