User guide

7.2 Sharpening knives

NOTE! Only rotating knives for granulators with an open rotor can be sharpened.

Other knives are disposable and are replaced when necessary.

Sharpening knives - granulators with open cutter

Keep the complete set of knives together as one unit.

NOTE! To avoid unbalance, all the knives belonging to the cutter must be

ground exactly the same.

Be careful when handling the knives, they are sharp and can cause personal

injury.

NOTE! Get an experienced craftsman to sharpen the knives.

Only sharpen the marked surfaces and respect the given dimensions!

The knives must be sharpened exactly, to get the correct cutting and relief angles.

Otherwise the efficiency of the granulator will be impaired.

The knife must be cooled during sharpening. The knives must not be burned or

blued under any circumstances, otherwise they will loose their hardness and dura-

bility.

If the knife is blued or burned, they can not be repaired by grinding down the

blued or burned area. The hardened knife is then completely spoiled and has lost

all its hardness and durability.

Use the Conair grinding jig SF-20 (accessory, art no. 3-030324) and a surface

grinder with magnetic table. The jig gives exact correct cutting and relief angles.

¥ Remove the knives adjustment screws.

¥ Grind the worst knife to make the relief angle 35¡.

¥ Tighten the knife in the right-hand position in the

jig, using spacer ÒAÓ beneath the rear of the knife

(see illustration).

Spherical washers should be used when tightening

the knife.

¥ Grind until all the irregularities on the knife edge

have disappeared.

¥ Retain the settings of the surface grinder and grind

all the other knives exactly the same.

¥ Grind the cutting angle of the knives to 30¡

¥ Remove spacer ÒAÓ beneath the knife.

¥ Tighten the knife and grind until the cutting

edge is 3 mm wide.

¥ Retain the settings of the surface grinder and

grind all the other knives exactly the same.

¥ The knives can be sharpened up to the limits

shown in the display.

After this, the knives are used up and must be

replaced by new ones.

Min. 56 mm

3 mm

Grind

UGG003/0398 CF Series Granulators

SERVICE 17