Hi all!

I just bought a simple mill (without xy-table).

1. What kind of collet is this (look at the attatchments), and where can i find them?
2. I have calculated the spindlespeed to about 20000rpm, i guess this is to fast to use on aluminium, what speeds am i aiming for?

The brand is "Varator"

Sorry about the picturequality, could'nt find my camera. So i had to use my cellphone.
//Tobias

Good luck with this one. I found a gang drill made by varator that has a b-12 spindle (same as yours I'm sure). Your collets look like Traub collets, but I don't find any matches to the specs you provided.

Does'nt anyone have more info for me??

//Tobias

Com one guys!!!
Nobody knows???

I don't know about the collet type but below is the formula for the Correct Spindle Speed:
How to Calculate a Spindle Speed
To calculate the RPM that a cutter should rotate, the simple formula shown below is used:

Spindle RPM = [Ideal Cutting Speed (Meters/Minute) x 1000] / [Diameter of the Cutter (mm) x PI] where PI=3.142
The only information we don't have at the moment is the ideal speed for a material. The table below shows a list of common materials and their cutting speeds, when using a H.S.S. (High Speed Steel) Cutter.

Approximate cutting speeds for common material when using a H.S.S. (high speed steel) cutter.

Free cutting mild steel
38 m/min
Low carbon steel
32 m/min
Brass or bronze
55 m/min
Aluminum or Alloys
200 m/min
Plastics
250 m/min
Woods
500 m/min

For example: To calculate the correct spindle speed for a 10 mm cutter machining plastic, the equation is as follows:
Spindle RPM = [Ideal Cutting Speed (Meters/Minute) x 1000] / [Diameter of the Cutter (mm) x PI] where PI = 3.142
Spindle RPM = [250 x 1000] / [10 x 3.142]
Spindle RPM = 7957 revs/min.

Hope this helps!!