Need help with point cutting bit

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Forum topic by karter56 posted 10-14-2017 02:14 PM 868 views 0 times favorited 3 replies Add to Favorites Watch
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8 posts in 2169 days

10-14-2017 02:14 PM

This is my first time using any kind of a forming bit on the CNC. I am using a 3/4 diameter, 1/2 shank, 3/8 radius point cutting roundover bit on 1” red oak. Can anyone give me a starting point speed and feed for this material?

-- Yes, dear. Whatever you say, dear.

3 replies so far

View DS's profile


3503 posts in 3199 days

#1 posted 10-16-2017 06:43 PM

Unfortunately I don’t have any experience with that type of bit.

There also, are several factors that go into answering your question.
How many flutes? How many RPMs? How many IPM?
Is this a Roughing bit, (Can go faster), or a finishing bit?
How aggressive will your cuts be? (How deep per pass?)
What kind of chip load can your machine handle?

Some trial and error may also be involved.
Typically a 3/8” diameter, two flute bit in Red Oak would run between 100ipm and 300ipm.
Too slow, and you will burn the bit. Too fast and you could break the bit. (Or stall your motors, if running on steppers)

There are charts you can get from the tool mfg’s that may give you a good starting point.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View oldnovice's profile


7563 posts in 4146 days

#2 posted 10-17-2017 02:54 AM

Perhaps you can find what you need here, at Onsrud the have a lot of free information available and they also have very good cutters of all kinds for decent prices.

You might also be able to contact Onsrud directly!

-- "It's fine in practise but it will never work in theory"

View Underdog's profile


1510 posts in 2814 days

#3 posted 10-17-2017 11:54 AM

I’ve got an Excel spreadsheet Chip Load Calculator from an Onsrud rep that I’ll pass on to you if you like.
Just PM me if you want a copy.

-- Jim, Georgia, USA

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