CNC style lathe home brew Lathe for drilling and cutting.

[Bodge]

PS I do not have a collet shaft to bore so I need to make one with a 14mm x 1mm Spindle Thread on it or find a 14mm x 1mm bolt to modify.

The previous long post prior to this has vanished into the ether..

basic questions were:-

How do you calculate torque loss as the speed is increased?

Speed required to machine PTFE ie drill a 6.1mm hole?

I'm currently using a SEIG micro lathe at about 1.5k rpm to do this.

The stepper is a 3.5NM or 35KG/CM torque

Is it worth gearing the stepper up using T5 belt maybe ?
I realize most lathes are geared down..

was trying to avoid needing to make Stiff mountings as no ability to machine Aluminium but the concrete lathe looks like an interesting idea that could be used with laser cut MDF or light CNC machined MDF.

This was better worded in the original that was lost this is a dyslexic quick reply.

Trying to make this from my bits and bobs boxes as no money to spend on very much.

I do have some cement and sand left over after installing my solar array..

The 10mm shaft is smooth I do regularly grind 6mm and 5mm stepper shafts with a laser cut Jig was asking to see if there are any other recomended ways to do this.