My spindle is heating up a ton. It was never not hot but after even an hour it is almost too hot to touch. I checked the belt tension thinking that maybe it was too tight but it seems good. Does everyones get this hot? I only have the 3500rpm spindle in but I have the 6k motor to put in (it came with the wrong motor and they sent me the right one). I don't want to put the 6k one in and have it blow the bearings. Khai told me that it has the 6k spindle in it...
BTW I have the 135 series 2...
My 200 gets hot, and I run it at 4000 rpm all the time. I was told by Rodney that they test them for 24 hours at max speed.
I haven't put a temp gauge on mine yet, but it does get hot, not hot enough to make you not touch it , but hot. I am guessing 120 degrees- 140 ?
I could be way off on that though.
With that said mine started to make a bearing noise yesterday. I have yet to check it out.
It gets hot in under half an hour. It gets real hot (I would say 150+) in an hour. I know for a fact that this thing didn't get run for 24 hours because it had the wrong motor in it and they didn't catch it until I had if for a week.
I will put a temp gun on it today but it gets hot enough not to touch. I haven't really checked location and will do that as well.
I bought a USB temperature sensor off of ebay, drilled a 1/4"(?) blind hole in the top flange of the spindle, and tapped in the temperature probe.
This of course doesn't give the exact temperature of the top bearings themselves, but it does allow you to:
- see if the bearings are running hotter or cooler over time (weeks)
- observe the change from adding a cooling fan
- add in a mach3 overtemperature alarm (I haven't bothered doing this yet).
- see if something goes horribly wrong.
Yesterday after 45 minutes of runtime, I think I recall the temperature being in the 50°C range.
My 135 didn't come with a cooling fan, so I added one: I drilled a 2" or so hole in the top cover plate of the head, and screwed on a smallish computer-duty squirrel-cage muffin fan (also from ebay). I covered over the ventholes in the side of the head near the top with duct tape (white duct tape, for aesthetics), so the fan draws air out from inside the head. When the spindle's been running for awhile, a steady jet of warm/hot air exits the fan. All good. Anyone who doesn't have a fan should add one.
My 135 came with the motor belt tightened "damn tight", so I loosened it off a little. I think this helps.
what are you doing while its heating up? is it idling, or are you cutting something heavy?
my nm200 spindle never gets very hot at idle, but the shaft can get super hot if im cutting certain materials that generate alot of friction. the heat gets transfered through the tool.
if its overheating just idling at 3500rpm, then you probabaly need the bearings checked as others mention. could be bad, or possibly just over tightened.
Do you use coolant on the 135 when it gets warm from material / cutter heat transfer ?
I use coolant on everything I can and my tools are cool, but my spindle and related areas get warm to very warm.
But I run my spindle at top speed almost all day long, very very few times does it run at a slower speed then 4000.
This is just about exactly my situation. Always 6000rpm, with coolant, head is warm to very warm - until I put in the cooling fan. Do you have a fan? If not, you should install one - Having a ~1hp motor without active cooling I would classify as an oversight on novakon's part - but I believe novakon has fixed the situation, and 135's newer than mine all ship with a fan.
id imagine that it isnt in the 135 as well. i know the motor itself would be heating up, but they should have a cutout teperature of about 120C internal, so the motor would shut off before getting to the point it would heat up the whole head "too hot to touch".
I put a temp reading on mine, 115-125 on the bottom , 125-135 on the top, after a few hours of running 4000 rpm max speed. That is cutting 1018 , 2 flute insert, 45-60 ipm , .025 DOC. This is on a NM 200 series 1. Mine has about 4-5 months of run time on it and in the last two months its been run almost every day for 5-8 hours minimum.