Accu Trak Metric Cut Type Knurls and Holders (CG Series)

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Knurling

Accu Trak Metric Cut Type Knurls and Holders (CG Series)

QUANTITY

CG SERIES 8.9 x 2.5 x 4 mm (0.350 x 0.098 x 0.157")

All Made From 8% Hi-Cobalt Steel with Lapped Tooth Profile.

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CUT TYPE Knurling is not widely used in U.S. market, but common in the rest of the world. The knurling dies are skewed (layed over 30°) to the work piece axis creating a cutting action rather than a forming process. Often times when knurling non-ferrous material (aluminum, brass, etc.) the forming action work hardens the material causing the crest to become brittle and break off. Not so with the cut type knurl - the milling action leaves a sharp solid crest for a perfect knurl.

There are both single and two die holders available. Interesting is the fact that to get the diamond pattern two straight tooth dies are used (on a two die holder) and for a straight pattern a single helical die is used. It is believed that the diameter of a finished knurled part can be more easily controlled with this method; just remember you aren't increasing the diameter of the work piece. Holder shanks can be mounted at right angle to the piece and always use plenty of coolant to wash away chips.

It's best to experiment with the Speeds & Feeds to get the best looking knurl, but generally a feed in the range of 0.07-0.2 mm/rev and a surface speed of 15-55 m/min will work. With softer metals (aluminum & brass) stay on the high end, but with stainless and other high alloys use the lower end. For stainless steel, or other higher alloyed steels, you should expect lower wheel life than that obtained with "forming" wheels

With a fairly rapid infeed to the final minor diameter of the workpiece, cut type knurls will normally track on any diameter. If not, a small variation to the infeed rate, or blank diameter will normally correct any problem. Once established, the blank diameter should be held within +/- .025mm (.001"). Depth of the cut should be .5-.6mm x pitch. The method of approach is very important to getting a good looking knurl. On the end of the work piece, approximately 1-2 pitches wide, plunge the tool straight into the part. After reaching the correct depth then traverse across the part.

Note: Do not just feed axially.
 

setups


setupss

 

single holder

cgholder


 

double holder

cgholder

Cut Type Knurls use a cutting action instead of forming the metal, greatly reducing knurling pressure. Often times when knurling non-ferrous material (aluminum, brass, etc.) the forming action work hardens the material causing the crest to become brittle and break off. Not so with the cut type knurl - the milling action leaves a sharp solid crest for a perfect knurl.

All Made From 8% Hi-Cobalt Steel with Lapped Tooth Profile.

 

 

cg

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