broken bit

broken bit

Postby garylyb » Fri Oct 06, 2017 5:30 pm

I was using a whiteside 1/4 inch compression bit to cut out a 10 inch circle on 7/8 inch thick hard maple.

I was using 150 ipm .25 pass depth and the bit and the bit broke about 3/4 inch deep into the cut.

I had used the same bit and speeds cutting 18mm baltic birch with no problems.

Was pass depth or speed or both too much? I put in a 1/4 spiral downcut bit to finish it with no problems.

Thanks,

Gary
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Re: broken bit

Postby 4DThinker » Fri Oct 06, 2017 5:36 pm

When a bit breaks while I'm using a CNC it is almost always a Whiteside bit and always while cutting deep into hardwood. I suspect the carbide they use is more easily broken than what some other brands use. Downcut and compression bits more likely than upcut spirals as they don't eject what they've cut as well as an upcut bit will.
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Re: broken bit

Postby garylyb » Fri Oct 06, 2017 5:39 pm

Well that's interesting. I'll order a different bit now.

Thanks.
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Re: broken bit

Postby CrowsWW » Fri Oct 06, 2017 6:58 pm

I use tools from https://www.vortextool.com/
they are really good in my opinion.

also you will need to adjust your Feeds & Speeds for each type of wood and tool you are working with.

look at the attached chip load chart. there are all kinds out there just find the one you like.

The Vortex Tool Selection Guide App is available for iPhone, iPad, Android Phone, or Android Tablet.
The App also includes calculators to determine chip-load, feed rate, RPM and metric conversions. I use this all of the time if remember to bring my cell phone
Attachments
Vortex Tool Chipload Chart.pdf
(66.74 KiB) Downloaded 40 times
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Crow's Woodwork's
http://www.crowswoodworks.com
I have a day job to support my wood habit!
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