Compounds and Composite Materials - PEEK Biomaterials - page 44

Table 3.4 Examples of Machining Conditionsdcont'd

PEEK-OPTIMA
Reinforced Process Units PEEK-OPTIMA

Rake Angle 10 - 30 5 - 10

Point Angle 90 120

Cutting Speed m/min 50 - 200 80 - 100

Feed rate mm/rev 0.1 - 0.3 0.1 - 0.3

Coolants a

Compressed air Compressed air

Twist angle of drill bit should be 12 to 16

Milling

Special Instructions Use a 5 e axis

milling machine
to enable a milling
angle of 15

Use silicon carbide or
diamond tipped tooling

Use diamond
tipped tooling

Clearance Angle 5 - 15 15 - 30

Rake Angle 6-10 6-10

Cutting Speed(m/min) rpm Up to 15000 Up to 15000

Coolants a Compressed air Compressed air

Feed may be up to 0.5 mm/tooth
Turning

Special Instructions Use silicon carbide or

diamond tipped tooling

Use diamond tipped
tooling

Clearance Angle 6-8 6-8

Rake Angle 0-5 2-8

Side Angle 45 - 60 45 - 60

Cutting Speed m/min 250 - 500 150 - 200

Feed rate Mm/rev 0.1 - 0.5 0.1 - 0.5

Coolants a Compressed air Compressed air

The nose radius of tool must be at least 0.5 mm

Notes: Internal corners should be filleted with a minimum radius of 0.2 mm.
Machine in the direction of fibre orientation for reinforced PEEK-OPTIMA.
a Filtered compressed air is recommended for all grades of PEEK-OPTIMA. Alternative coolants selected by device manufacturer must
not affect the biocompatibility of PEEK-OPTIMA.

important aspect for any implantable material and
some such details will be provided here.
In one notable study, the material was implanted
into rabbit muscle for periods of eight and twelve
weeks and reactions were observed in the tissue [34] .

3.6 Biocompatibility of CFR PEEK

CFR PEEK polymer's biocompatibility has been
the subject of considerable study. This is an