# Thread: How would YOU machine this part?

1. ## How would YOU machine this part?

Hello. This is my first time posting in a forum, and I hope that I have posted this question in the correct one.

As per the request of my employer, I am going to ask a very vague question. How would YOU go about machining this mechanical rosette?

Currently, the company only has a 3-axis mill which we use to create prototypes. We essentially want to know if there is some way we can machine this mechanical rosette using our mill. Please see attachments. Dimensions included.

Note: Material is stainless steel.

2. First off, you're short at least three critical dimensions.
The angle of the notch for each v, the number of v-notches and whether or not the bottom of the notch is perpendicular to the axis.

That last is the important dimension. the 8.68 degree slope is going to be a fuction of the angle of the v-notch, the path of the bottom of the v and the number of teeth in your rosette.

Assuming that the v-notch is a 60 degree angle, one could either mill it with a 60 degree cutter or with a shaper and a 60 degree cutter.

If a 90 degree notch can be used, I would set the part on a rotary table, angle the table 45 degrees, then make the cuts one at a time with a standard end mill, rotating the table between cuts.

If the bottom of the v-notch is not parallel to the back surface, the rotary table would have to be angled an appropriate amount around the z axis as well.

Jim Hurlburt
Yakima, WA

3. 1. A dividing head with a mandrel to mount the blank
2. Mount the dividing head to the table, with the longitudinal center line at the angle needed.
3.Use this type of mill cutter; HSS 60° Double Angle Cutters
4. Set the center of the angles on the cutter, with the center line of the part/dividing head.
5.Cut from outside edge into center and back out again(free pass going out)
6. Index to next cut and repeat till done.

4. This is a compound angle .

KISS , way.

tip and turn "SIGN PLATE" the part.
your leading angle will be of course deeper in the back or outer edge.
your cutter will have to be a " \| " wheel like cutter.
the angle of the cutter is a certain angle and not the angle of the cut.
Hint :
the cut will cut the deeper side first.

No I did not read packrat post before I wrote this.
I still like to grind this part, If you get what I mean.

I use to work in a tool and die shop.
I did alot of lead in work for strips.
I almost got excited the first time I did one.
the Grinding wheel hit high on the wheel before it hit low.

• Or just buy a Hirth coupling, which your picture appears to be. They're commercially mass produced and sold.

Dick Z

• In response to jimhurlbert,

The angle of the v-notches are 58.71 degrees, there are a total of 36 notches, and the bottom of each notch is indeed perpendicular to the axis.

Thank you all for your responses as they will all be of help. I am also glad that Richard Zastrow pointed out that this piece also goes by the name of a Hirth coupling. I will be looking into that today.

• Try "googling" Voith Hirth Couplings.

Dick Z

• Richard,

I've taken a look into Voith and the company seems like they just may be able to supply something of use to us. I'm currently looking into obtaining a catalog. Thank you for the tips! They are very much appreciated.