u/Swift0095

Greetings of the day!

I made my own spindle cartridge by modifying a CNC lathe tool holder (ER16). The runout on the spindle was bad (0.1 mm).

Things didn't go the way I expected. The spindle housing was poorly made and the bearings were not a tight fit. Even the tool holder I bought had a clearance fit with the bearings.

Now I am inspired by the Tormach Tooling System R8 Spindle cartridge.

I am tempted to buy one of those Chinese cheap BT30 spindle ( Aluminum housing) from eBay. But I've seen reviews saying that they are not rigid enough, have bad runout, and are not suitable for precision work. And also, the precision BT30 spindle cartridges are very expensive!

**Any suggestions on buying a ready made spindle cartridge that is cheap and reliable.** Something like a ready made R8 Spindle cartridge that is rigid enough to cut steel and driven by 1Kw servo motor.

I was thinking something like a Grizzly Mini Mill spindle head.....

Thanks in advance!