• The preferred steel to use is high speed steel.
  • The most desirable machine speed is around 2000 rpm.
  • The material responds best to scraping using a negative rake and an under-cut tool.
  • For face turning the material go in gently with the tool until you can feel the consistency of the material.
  • For drilling holes over 200 – 300 mm deep, the recommended tool is a forstners tool.  It is designed for deep hole drilling and will give maximum swarf clearance.
  • This drill is not recommended for pen blanks and caps etc.  For this we would recommend an ordinary carbide tip drill, as it is better for long term wear resistance.
  • If the tool finish is smooth then you will only need a grey silicone paper grade 1000-12000 to get a satin finish.  However if the finish is slightly rough start with a grade of 600 and then mode up to 1000-1200.
  • For a final finish we recommend friction polish, shellawax, burnishing cream,…
Semi-precious

Dimensions: diam. 20 mm, length 130 mm

A   COBALT BLUE
B   AMBER
C   BRIAR
D   LAPIS LAZULI
F   ONYX
G  DARK CORAL
H  N/A
I    N/A
J   ONYX
K   MALACHITE
L   BRIAR
M  COBALT BLUE
N   LAPIS LAZULI
O  DARK CORAL
P  AMBER

Code Description Price VAT excl. Price VAT incl.  
GPS769/20 Polyester BRIAR diam 20 x 130 mm C € 2.48 21% € 3.00 Add to basket.
GPS835/20 Polyester AMBER diam 20 x 130 mm C € 2.48 21% € 3.00 Add to basket.
GPS854/20 Polyester COBALT BLUE diam 20 x 130 mm C € 2.48 21% € 3.00 Add to basket.
GPS857/20 Polyester MALACHITE diam 20 x 130 mm C € 2.48 21% € 3.00 Add to basket.