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.

[JAZZCNC]

Go check Irvings spread sheet out this will give you what you want.

http://www.mycncuk.com/forums/showth...otor-do-I-need

[Bodge]

Great thank you just down loaded it... I got the torque wrong on reading the spec as I'm running windings in series the torque has increased from 3.5 Nm to 5Nm os its roughly 50 kg/cm.

I just do not know how much torque is required to drill PTFE with a 6mm drill.
Then how much torque is lost by running at 1K5 RPM hope fully this sheet will help.

I have the 500W supply up and working have programmed the Arduino board driving the 4.2A stepper controller, made an opto rev counter thing from half an Olham coupling.

Will post an updated picture up here http://www.mycncuk.com/forums/blog.php/2916-Bodgecurrently only one there at the moment.