How can a steel cylinder be parted in concentric rings with small gaps between them?

For a project, I have to part steel round stock, like the cylinder in Fig. 1, but not perpendicular to the symmetry axis (like a bread in slices) but in concentric rings 3 inch long and having the outer diameter as close as possible to 6 inch, 5 inch, ... , 1 inch.

I mention that I have little experience with machine shops and the capabilities of the tools existent there.

Question: What is the minimum gap I should expect between two consecutive rings, say the one with the ideal diameter of 6 inch and that with the ideal diameter of 5 inch (see Fig. 2)? Can this minimum gap be of the order of 1 mm or it has to be larger like 3 mm, 5 mm, etc. in width?

Fig. 1. 12L14 Steel Round Rod: 6″ Dia, 3″ Long

Fig. 2. Two concentric rings with the outside diameter as close to 6 and 5 inch respectively.

• What is the length of the cylinder
– AJN
Apr 8, 2023 at 4:18
• @AJN : The length of the cylinder is 3 inch and the diameter 6 inch. You can click the link below Fig. 1 for the characteristics of this solid cylinder. Apr 8, 2023 at 4:26
• So make a cutting tool that will do the 3mm width, considering the depth you have available to provide the strength needed to cut at the distance from the support you need. Apr 8, 2023 at 14:51
• @SolarMike , I calculated that a parting lathe knife like here: youtube.com/watch?v=fZlWJ_JqQtA , could make the cut in Fig. 2 with the gap width about 3 mm if the free part of the knife is 1 cm x 2 mm x 1+1/2 inch. Does such a thin knife exist? (I repeat I am not a machinist.) Apr 8, 2023 at 15:09
• Sounds like that will vibrate, chatter and break, Check out boring bars. Note they are not places that sell alcohol & poor music. Also parting tools. Apr 8, 2023 at 15:29

A few points here.

Material

First of all, is it particularly crucial that it be steel? If you can use cast iron instead, the raw material costs around half as much:

https://www.mcmaster.com/products/discs/oversized-easy-to-machine-gray-cast-iron-rods-and-discs/?s=cast+iron+disk