With 3.5NM or 35 Kg CM torque at slow speed is there any kind of Graph calculation showing how to calculate the Torque loss at higher speeds of rotation?

Currently I'm using a SEIG Micro lathe set at about 50% of maximum speed to do this drilling operation so lets say its around 1k5 RPM as the Micro lathe max is only 3K rpm using a 6.1mm drill.

For machining plastic like PTFE what would the ideal speed be?

Unfortunately I'm working on using only things that I have in my collection of bits and Bobs.

What level of Torque is needed to drill into plastics like PTFE with this size of Drill is there a way to calculate this?

The option I was trying to avoid was gearing up the stepper motor as Lathes appear to be geared down, so without spending much money.
It could be driven by T5 belt in a geared up configuration to minimise the Torque loss at higher speeds.

Reasons why I'm trying to avoid gearing up is my ability to produce accurate STIFF mountings / rock solid to do this.
This would need Aluminium machining ability. Though I did just see a concrete lathe configuration here that could work possibly from laser cut MDF or light cnc cutting.

The shaft is a smooth 10mm with out a D ground into it but I have made a Jig for grinding 6mm an 5mm Stepper shafts so its not to hard to convert it to 10mm shafts was asking to see if there are any other recommended methods.