Picked up a pack of Ultra Shear Engraving bits on Woodpecker some time back, and getting around to putting them to use. What I’m realizing now is that I have bit dimensions, but no guidance on Feeds and Speeds.
They are 1/4" v-bits that range from 15 deg. to 30 deg., so it’s possible I’m overthinking this, or just overlooking where an obvious answer lives, but wanted to tap the hive mind.
Suggestions appreciated for a Shapeoko 5 Pro!
Here’s a link to the product page if it helps!
If C3D has an equivalent bit then either use that bit but put in your woodpeckers bit or copy that bit and make a custom tool database with the copied material.
Many OEM put up F&S but many of those are for industrial CNC machines and not hobby ones. So always take those with a grain of sale.
So if C3D does not have an equivalent bit and no OEM F&S to start from then pick the closest C3D bit and make a custom tool and start with conservative F&S numbers and slowly increase until you need to back off and modify your custom tool. Testing is the only way to adequately figure out what the F&S needs for a particular material and your particular machine. There are no magic answers to give you the exact information without trial and error.
Vee bits are tricky because the cutting surface speed changes, gets faster the further up the bit.
Ideally, you would calculate the spindle speed based on the diameter at the depth of cut being used. So for a 15° cutter & a 0.100 depth
Your effective diameter is 0.026". Plug this in to fswizard…
At that small a diameter it’s likely going to use the max spindle speed
It’s probably shooting for a cutting surface speed (Vc) of around 1000, so you may have to play with the feedrate to get good chips & avoid burning.
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