Does anyone know if there is a recommended spec for spindle belt tension? Mine came from the factory extremely loose. I tightened it a bit but I’m not super happy with how the spindle sounds at 8000 rpm.
Mine sounds like a banshee at 5k never took it to 8k. Can you post a video?
I tightened mine a bit. Couldn’t tell you on tension but it’s somewhat loose looking but I was afraid to go too loose for fear of slipping a tooth/gear.
Bearing ended up going out and Langmuir replaced it. Same way the second time around. But it sounds pretty much like all the videos you see on youtube.
@Richardbeck83 has a great channel with lots of videos.
2 Likes
Here’s a video of the spindle noise at the different RPMs:
I decided to just send it and run the spindle break in program. Everything still seems good other than the spindle and motor getting too hot to touch. I assume that’s normal though after 2hrs of continuous running.
Thats what mine sounds like. The spindle cover has a warning that itll get to 200 degrees so ya it gets hot.
1 Like
Gross! That sounds awful! I’d try adjusting it again. If not…hit up langmuir.
Yeah it’s hard to know what is coming from the motor and what is coming from the belt drive. I’ll probably try removing the belt to determine that. Seems like the higher pitches are probably motor sounds
Mine is noisy as well. I’m pretty sure the noise comes from the motor bearings being side loaded. To bad the drive pully is not mounted on a jack-shaft that is directly driven by the motor using a misalignment coupler. Then it could be nice and tight without risking the motor bearings. If it’s not tight enough you get lower quality surface finish and shorter tool life.
1 Like
I’ve had to replace 3 spindles due to bad bearings. The third one just locked up. I started thinking it was the motor or the belt before that happened, and I asked langmuir what the recommended tension of the belt was, and they told me “we don’t really have a recommendation”. I turn the motor on and adjust for noise and it ends up seemingly loose, but runs fine and doesn’t wear the belt at all. Apparently they’re temperature checking spindles now, so hopefully I’ll not have anymore issues. But it’s still noisy.
But it’s still noisy.
Is it as noisy as WD40’s video? Mine has some noise, but not like that.
It’s definitely been that noisy previously. I’m not sure with the newest spindle because I don’t have everything back on it yet. But during the break in, and a light resurfacing of the plate, it’s still not very quiet.
This would make sense. Thankfully I only have about 9 tenths of spindle runout (that’s using some cheap Amazon collets) so I think I can rule out bad bearings at least for now.
I had a belt burn up and I was trying to make sure the part number was correct. In this post Jake with Langmuir provided some guidance on how to tension the belt.
2 Likes