Tapered Ballnose and Veebit Feeds And Speeds Considerations

[linkreincarnate]

I just bought This and this from amazon.  I also have a whiteside router veebit a whiteside router carving liner, a spoilboard surfacing bit  and a set of 1/8 shank tapered ballnose endmills.

No I'm not posting to humblebrag about my anemic tooling collection,  I need some help determining speeds and feed for these types of bits.   The millright cut calculator is a great tool but unfortunately it doesn't take bit shape into account and I am unsure of how to compensate the speeds and feeds it gives when I am actually using triangular bits.   (Also being able to go up to 1 inch bit diameter for that spoilboard bit would be hugely appreciated,  the power route can take 1/2" endmills so I feel like the tool should be upgraded to at least give feeds and speeds for those bits but I'm off on a tangent now)  I would go to the manufacturer but a lot of these amazon manufacturers are actually just drop shippers with no info on or understanding of what they selling.


At this point even just a safe rule of thumb to apply to the feeds and speeds given by the cut calculator would be great.


In particular I am interested in feeds and speeds for these bits in hard and softwood.


Anyway I know one of you braniacs can help a fellow woodchuck out.  Thanks in advance!

[Bruce]

How are you planning on using the bits? Finish carving of reliefs?

[linkreincarnate]

Yeah.   I have a few 3d carvings I'd like to do that have fine details.  I'd really appreciate the help on the the 1mm 1/4th in shank tapered one especially.  

[Bruce]

I typically use an 1/8" or 1/4" end mill to do the rough cut and then the tapered bit for the finish cut. I use a stepover of 0.18mm to 0.23mm. I usually run around the 2000mm/min mark. I set the spindle to max 24000 rpm. You may be able to get a faster feed rate on a PR machine. It depends on the Z axis moves, how much bobbing up and down it does. But GRBL automatically compensates for the Zaxis and slows down the feed in those spots. Really with any relief finish cut, using any small diameter bit and the stepover so small the feed rate can be set as fast as your machine can handle.

[linkreincarnate]

So basically set it to 8000 and grbl will limit it to the max that will allow the z to reach full depth on it's passes anyway. I appreciate the insight. I think I have enough to go on to get a decent cut recipe now. Thanks.

[Bruce]

You may want to start out a bit slower, maybe 5000, and work your way up using the real time feed adjustment. That way if I'm totally off base you won't be cussing at me...