SALVO Serrations, Splines & Knurls

Salvo Knurls

Salvo designs and manufactures many different types of knurls such as: straight, helical, tapered, diamond and square. They can be rolled by many different methods including Bump Rolling (very simple), Straddle rolling (very accurate), and End rolling (accurate). We design tooling as well as make dies for your present tooling (ours or theirs).

Let us give you a quote. Send us a print, the machine and position that you wish to use, the type of material that you will be rolling, and any other particulars for your part and we will send you a quote.

You may contact us by Phone: 810-346-2727, Fax: 810-346-2616, or E-mail: salvo@greatlakes.net.

Knurls are fairly simple to roll, but in order to get a good clean knurl without flaking or slivering and good die life, it is necessary to know specific details about them. Regardless of the exact number of teeth produced, it must be possible to divide the circumference of the blank evenly by the decimal pitch. For example, a one inch diameter 30 T.P.I. (T.P.I = teeth per inch) knurl would be calculated as follows:

Decimal pitch is equal to 1” divided by the T.P.I. hence; 30 T.P.I. divided into 1” equals .0333. The circumference of a one inch diameter is 3.1416.

3.1416 divided by .0333 equals 94.2 teeth. Since the pitch must divide evenly into the circumference of the blank and it obviously does not, the blank must be increased to 95 teeth or decrease to 94 teeth. Multiply the number of teeth desired by the decimal pitch .0333 and it will equal the circumference of the blank, dividing this by Pi (3.1416) equals the corrected blank diameter.

TYPICAL SPLINE, KNURL OR SERRATION SET-UP

(as seen on page 13 of Salvo’s THREAD ROLLING ON THE AUTOMATIC 3rd Edition Handbook)

Example of a Salvo Model CBS Attachment with a Special Adapter for an Okuma CNC Lathe, used to roll Diamond Knurls on Salvo Microplugs as shown.

Below are a few examples of parts with Knurls rolled on them:

Salvo Serration Rolls

Send us a part print, the machine and position that you wish to use, the type of material to be rolled and we can send you a quote.

You may contact us by Phone: 810-346-2727, Fax: 810-346-2616, or E-mail: salvo@greatlakes.net.

Below is an example of a part with serrations rolled on it

Salvo Spline Rolls

In Spline Rolling it is necessary to hold a constant number of teeth over wires to a close tolerance. It is somewhat different and a little more difficult to develop the spline roll & blank diameter and to get the proper amount of teeth with the proper wire reading and major diameter than a paticular thread.

Please contact Salvo for more information. You may contact us by Phone: 810-346-2727, Fax: 810-346-2616, or E-mail: salvo@greatlakes.net.