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Setting 5/16 biy for cnc

6/15/16       
Bob Member

Hi
I want to swap 3/8 down-cut with 5/16 down cut. I
I wondering what setting i need to enter for 5/16 bit ?

6/16/16       #2: Setting 5/16 biy for cnc ...
Brad

Well one setting would be 0.3125 in or 7.937mm (8mm) depending on your units.

Where/how this would be entered depends on your model of CNC and control.

Have you contacted your CNC supplier's support group?

6/16/16       #3: Setting 5/16 biy for cnc ...
Bob Member

I was thinking about setting for speed and feed rate ?

6/16/16       #4: Setting 5/16 biy for cnc ...
Mike

What are you cutting, and how deep? Can we assume two flute tool? Is this a dado, or rabbet? If you are new to all of this, there are chip load calculators and other guidelines available. Onsrud has really good information available in the back of their catalog. Vortex Tool has a great app for iphone, or android free to download that I believe has feeds and speeds for their tools based on the important stuff like material and cut depth. Most of us old guys have a good feel for it, but for newer users there is a ton of stuff available online, or phone apps. You just have to look and it is there.

6/16/16       #5: Setting 5/16 biy for cnc ...
Larry

Learn how to calculate chip load and you can use it for any bit. To determine if you are going about the right speed, (carefully) touch the bit right after it stops. Burned fingers, too slow of feed for the rpm or too deep of cut for the size of bit. Onsurd's info is also available on-line including how to calculate chip load.

6/17/16       #6: Setting 5/16 biy for cnc ...
Chuck Hicks Member

Bob,

All great responses above. I would definitely recommend getting comfortable with chip load Ex 16,000 RPM x 300 IPM x 2 Flute tool 300 / 16000 = .01875 / 2 = .009 chip load only an example.
But, your ears and eyes are still going to be very valuable also. I would also recommend an amp meter on your machine if you do not have one. You will be able to see the tool getting dull before you can hear it.
You are probably going to reduce the feed rate by 10 to 20%, depending on depth of cut and material being cut. Also, make sure the collet is new or not worn.

Safe Routing,


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