Newbie with Emco Compact 8 /w Mill head

[Fermic]

Well, I made something with my lathe : alu PCB holder with a magnet underneath it. The finish is nice and I want more of this by grinding a HSS tool for turning and giving better finishes on aluminum.

I am not sure if the ISO 10 oil is the right one for lubing the rest of my lathe alongside my way oil, any suggestions ?
Lately, I have been noticing that my lathe vibrates excessively at 1000 RPM. That's normal ?

 

[mikey]

Looks like you have some chatter marks on top, Fermic.

No, the lathe should not vibrate at 1,000 rpm. Is it belt tension or an old, worn belt?

 

[Fermic]

No, the lathe should not vibrate at 1,000 rpm. Is it belt tension or an old, worn belt?

With the old belt, it feels loose at A and C pulleys. Requiring to use the tension arm. It vibrates loudly too.

For the new belt ( Gates brand ) 5M590, it can be attached to the A and C pulley and feels snug. Without the tension arm down, there less vibration but as I drop down the arm it also does vibrate too.

Here's pic of my old belt, handling it leaves dust in my fingers :

 

[mikey]

Are the pulleys co-planar? That is, do the grooves line up?

 

[Fermic]

Are the pulleys co-planar? That is, do the grooves line up?

At my visual inspection, they are co-planar on A and B to C pulleys. Grooves does line up, I don't find any belt twists.

Something to note, the belt on the pulley B does make the lathe vibrate and I don't have a new belt to replace it.

I am not too sure about the main spindle bearings, my hand spin test somewhat give 1-2 turns but if I hand spin faster then I get more than 2 turns.

 

[mikey]

Try tightening up on the preload; you want about 1 to 1.5 turns max with a hard spin.

Might be time to change that other belt?

 

[Fermic]

Got it, thanks. I'll be getting things to fix my lathe.

 

[Fermic]

Small update :

I managed to tighten the chuck and I got from hard spin test at 1.8 turns, but I broke my 3D printed wrench when trying to tighten it once more.
Still, there's vibrations starting 1000 RPM

Also I made another PCB Holder but this time I damaged 2 HSS pre-cut bits and I need some tips or layouts to regrind mine back in shape. These pre-cut HSS toolbits are "8 pc. HSS 5/16" Mini Tool Set" from Grizzly
One right-hand offset and I tried to regrind with my bench, I also screwed it up. And one turning tool that just stop cutting aluminum.


My broken 3D printed hook spanner I designed to save the cost of getting the metal one :

 

[mikey]

1.8 revs is a bit loose but should be okay for now.

Show us your tool and we might be able to help. Have a look at this thread so you can become familiar with the nomenclature first.

 

[Fermic]

Here these pictures, it wasn't easy getting close up shots with my phone.