tru-cut sprockets flame cut steel

TRU-CUT STEEL SPROCKETS - Why and How

Tru-Cut flame cut sprockets are more accurate, tougher and harder than cast tooth sprockets. Widely used with "Engineering-Class" chains for slow speed power trans mission and conveyor applications, these sprockets will also effectively and economically operate with ANSI roller chains (size RC #120 through RC #240).

TRU-CUT steel sprockets have many advantages

Being made from high carbon steel plate, Tru-Cut sprockets have a 300% higher tensile strength than cast iron sprockets .

Steel sprockets are unbreakable.

Since l045 plate is used, the "as burned" tooth hardness of flame-cuts averages 30-3 5 Rockwell C, and is harder than all iron sprockets except heat treated alloy iron castings which approach 40 Rockwell C, The tooth hardness of Tru-Cut sprockets can be increased to 55 Rockwell C by flame hardening. Harder tooth surfaces will wear longer.

When used with ANSI roller chains the hard tooth surface (30-35 Rockwell C) resulting from the flame cutting process is a distinct advantage . Plate steel sprockets with machined teeth are much softer and having them heat treated to increase hardness costs extra .

Tru-Cut sprockets usually cost more than cast iron sprockets, but the quality, service and longer life more than offset the higher initial cost.

Tru-Cut sprockets are normally available in three to four weeks . This includes so-called special sprockets, regardless of pattern availability or size of the sprockets .

Tru-Cut sprockets can be furnish ed to 96" outside diameter in one piece. Larger sprockets are made in two or more mated sections. Plate thicknesses vary from 1/4" through 4" in commercial widths. Smallest practical chain pitch for flame cutting is 1 1/2" and the minimum burned pitch diameter is approximately 3". Maximum diameter, in segments, is unlimited.

Many types of special sprockets can be furnished. These include split construction, gap-tooth, skip-tooth, segmental rims, multiple width ( two through four rims), ring sprockets, adjustable-hub, short-chord segments, hunting tooth, double-duty, compensating, etc . sprockets . Any type hub is available (A, B, C, D, Shear pin, Taperlock, QD, and Shear Coupling) .

TRU-CUT SPROCKET SELECTION

I. SPROCKETS FOR STANDARD CHAINS, SPECIFY:

Chain size (number marked on barrel or sidebar) .
Number of teeth required.
Bore, keyseat, setscrew .
Hub Type (B or C) see page 7 for minimum standard sizes.
Hardness required (Rockwell C 30-35 is hardness as flame Rockwell C 47-55 is achieved with standard heat treating).
Is sprocket one-piece or of split construction?
Is bronze bushed bore required?
If Type A plate-type sprocket (no hub), specify: - center hole ; bolt circle ; number and size of bolt holes .
If minimum plain bore (stock bore) is required, specify ultimate or max imum bore required.
Any special tooth contour (please supply print).

TO DETERMINE PITCH DIAMETER AND PLATE THICKNESS WHEN NOT KNOWN.

To determine sprocket pitch diameter , multiply chain pitch by tooth constant shown in table on page 6. For Skip Tooth sprockets or Traction Wheels , use number of chain pitches on pitch diameter and not number of teeth.
Deter mine plate thickness fro m table and sk e tches below.

SPROCKETS FOR SPECIAL CHAINS:

In addition to all of the above information, it is necessary to determine pitch of chain:

Measure roller diameter. If badly worn, try to determine original size.
Measure height of chain side-bar.
Is there any O.D. interference with chain attachments, guards, etc.?
Are there rods or bars thru chain sidebars between the rollers? If so, please locate and list size of thru rods.

SPROCKET PITCH DIAMETER CONSTANTS

To obtain the pitch diameter of a sprocket, multiply the constant for the number of teeth from the table below by the chain pitch.

STANDARD HUB SIZES

FABRICATED STEEL