What Tool is Used for This????

[bill south]

Hey Ya'll. Greetings from South Carolina!!!! I have a simple question for the machinist on board. In the picture below, what kind of cutter was used to cut these serrations? Also, it appears that the point at the end of each serration is due to the tool being lifted out of the cut at the end (I hope I described that right!). Would you guess CNC or master machinist and what kind of tools can be used???
Thanks in advance.
Bill

[fkaCarel]

Looking at your picture?????, I would say they used dynamite. Quite universal tool.

[bill south]

Oops!

[fkaCarel]

Minimal solution: pointed flycutter.

[masterblaster]

This was an included angle cutter. Probable a woodruff style end mill with the diameter to match the ends of the cuts, where when they stop the cut it leaves the pointed ends of the cuts. If it was a production piece, it was CNC. Can be done by hand by stepping over but much slower as the stop cut point will be different each line.

[dertsap]

threadmill

[widgitmaster]

Not ALL cutting tool are bought in the store, many old school machinists would prefer to free-hand a nice tool on a grinder, stone it to match a specific form or angle or radius! They can either be end cutting or horizontal side cutting single point tools, they usually cut with slow feed and speed but do the job most adequatly! It is a skill that should be learned by all machinists, and is rarely used in today's world of 3D automation!

The same cut can be done with a 1/16" carbide ball end mill (standard off the shelf cutter) and several passes at a time using high speed CNC machines to produce the desired form! So you can see there are many ways to skin a cat!

If you are doing a prototype, I would suggest the 1st procedure!
Eric

[fkaCarel]

If you are doing a prototype, I would suggest the 1st procedure!

So that would be the dynamite?

[dertsap]

threadmill would be the easyest and quickest , if you don't have one take a staight flt tap grind off the flutes except for one , two maybe three passes

[masterblaster]

Old school? Hammer and chisel? Chasing tools? And your not going to get a V notch with a ball end mill no matter how good you are. Just messing with you. The thread miller and and included angle cutter are regular off the shelf cutters. You could even grind the slots, as long as you want to use the grinder to grind your own cutters. Form grinding of these parts is a popular approch.There are lots of ways to do it. It makes sense to look for the fastest and easist methods.

[stymye]

I recall those type of cuts years ago with a small shaper.

don't see them much anymore

[big_mak]

D-Bits from Micro 100, you can get them with a bunch of different included angles, we have them in 30, 60, 90, 100, 120 degrees, in a variety of diameters. You can get them from www.Travers.com