how to 'treat'

[RobSm]

HI. I am considering using a 1" (25.4mm) roundover bit - without the bearing, see photo.

For feeds & speeds how should I think of it? V-bit, End mill, form bit?

In ferreting out info from various sites the speeds & feeds are frightening to me .

Any advice appreciated.
Thanks.

[FixitMike]

It is obviously a form tool. It looks like total diameter is 2 1/2", so I would use the feeds and speeds for an end mill of that size.

When a bit like this is used in a router table, one takes a number of shallow cuts to complete the job. I would do the same with a CNC router.

You can use a guide vector for the outside diameter of the tool that is offset inwards 1 1/4" from the desired outline and profile cut outside of the vector. I would also offset additional vectors 1/4" and 1/2" outward from the guide vector, and make multiple passes starting with the outermost vector.

In addition, set the cut depth to suit how you set the Z0 for the bit in relation where the cutter is tangent to the top of the material.

I suspect it will take a number of test tries to get all the numbers correct.

[mezalick]

Here is some RPM router speeds from Magnate,,,https://www.magnate.net/
• Run 24,000 rpm maximum for 1" overall diameter router bits;
• Run 18,000 rpm maximum for 1-1/4" overall diameter router bits;
• Run 16,000 rpm maximum for 2-1/4" to 2-1/2" overall diameter router bits;
• Run 12,000 rpm maximum for 3" to 3-1/2" overall diameter router bits;


Michael

[RobSm]

Thanks.

[dealguy11]

The Magnate numbers are maximums. I never run at bit at 24k on a CNC unless I'm in the mood to smell smoking wood. On my machine I rarely run anything over 15k. Has to be balanced with feed rate, of course. The faster the spindle rate, the faster the feed rate.

[adze_cnc]

Here is some RPM router speeds from Magnate

That's an odd gap between 1-1/4" and 2-1/4".