Filing Room Consumables

The term "machine knife" indicates a knife fitted to a machine which performs a special cutting function. There are a great many different machines for different cutting jobs, so the knives are made in varying shapes and different alloys.

Specialized machines using different grinding wheels have been designed to sharpen the various knives. The most commonly used wheel types are:

Straight Wheels (Type 1)
Cup wheels (Type 6, 11 and 12)
Cylinder Wheels (Type 1 and 2)
Segments

Most machine knives are made from either high-carbon steel or from one of several alloy steels. They are hardened and tempered to maintain the best cutting and edge holding properties.

Grinding wheels for sharpening machine knives are:

Made from friable or combination abrasives which have cool cutting properties.
Used to avoid burning the knives and drawing the temper, which could destroy the edge-holding properties or cause checks or cracks.

The save general type of wheels used in sharpening are also used for surface grinding and beveling operations in the manufacture of machine knives.

Surface grinding usually will require:

Combination abrasive (40A or 42A)
Friable abrasive (47A, 49A or 50A)
In grit sizes 24 to 46

Beveling and sharpening operations require abrasives in grit sizes 36 to 80, depending on the quality of cutting edge desired. Grades may range from G to K, depending on variations on operating conditions such as:

Wheel speed
Work speed
Power of machine
Degree of pressure used in grinding
General condition of the machine

	10 x x-1/2 (use) x 1" Rim Nut Inserted 50A46a.H11-BB2 50A46.1-II2-BB2 5A46.1-K12-BG-T
8 x 3 (use) x 1" Rim Nut Inserted 50A46-H11-BB2	10 x 4 (use) x 1" Rim Nut Inserted 50A46-J12-BB2 50A60-K12-BB2
8 x 3-1/2 (use) x 1" Rim Nut Inserted 50A46-I12-BB2	12 x 4 (use) x 1-1/4" Rim Nut Inserted 50A46-H11-BB2 5A46.1-K12-BG-T
10 x 3 (use) x 1" Rim Nut inserted 50A46.1-J12-BB2 50A60-K12-BB2 40A60.1-G8-VA7	14 x 4 (use) x 1-1/4" Rim Nut Inserted 50A46.1-H12-BB2 50A46.1-I12-BB2 50A46.1-J12-BB2 50A46.1-K12-BB2

Mounting Procedures for Nut-Inserted Wheels

Inspect all shipment containers for shipping damage.
Inspect all wheels for physical damage.
Remove thread protectors and blow out any sawdust or debris that may interfere with bold threads.
The mounting plate must be flat and the sides must be parallel. It must run true and be in good balance. All burrs and high spots must be removed.
All screws should be of sufficient length to engage the threads properly in the inserted nuts. The screws should have square ends and threaded to the end. The screws should be of correct length so the screws do not bottom out and the diameter is such that it will not bind in the nut-insert.
Make sure there is no debris on the plate surface or on the wheel surface. Place plate on the wheel lining up the bolt holes to the nut-inserts. Insert screws and hand tighten all screws making sure there is not binding or cross threading. When everything is in correct alignment proper tightening not to exceed 15 foot pounds can be applied.
Remount wheel to grinder, start grinder and let wheel run for approximately one minute at full speed. Dress wheel if necessary and begin to grind.

Pacific/Hoe Saw and Knife Company
World Wide Corporate Headquarters
P.O. Box 82155, 2700 SE Tacoma Street
Portland, Oregon 97222
Tel (503)234-9501 Fax (503)234-3506