Notes from the shop floor
Design-for-manufacture guides, material comparisons and updates on what we're building.
Why Does Increasing Chip Load Sometimes Reduce Chatter Instead of Causing It?
Because chatter is a resonance problem, not a force problem, and a heavier chip load can pull the cutting frequency away from the frequency the tool wants to vibrate at. More chip load usually means more force, but it also means fewer flutes engaging per unit time relative to the vibration cycle, an
What Causes Carbide Drills to Chip Out When Drilling for a Tapped Hole?
Carbide drills chip out at the margin or the cutting edge when the drill flexes or the exit breaks through unevenly, and both are more likely on tap-drill sizes because those holes are usually deeper relative to diameter and closer to full engagement than a clearance hole ever is. Carbide has excell
How Do You Hold a Very Thin Titanium Blank for Machining Without Distorting It?
You spread the clamping force over as much of the part as possible and remove material symmetrically so residual stress releases evenly instead of all at once. Titanium's low thermal conductivity and springy modulus make it distort more visibly than aluminum or steel at the same wall thickness, so b
Why Does a Part Chatter on Some Passes But Not Others With Identical Parameters?
Because the parameters that stay identical in your program aren't the only variables in the system. Stickout, engagement, and the part's own stiffness all change pass to pass as material comes off, even though feed, speed, and depth of cut stay the same in the code. Chatter depends on the whole stru
Why Does Stainless Steel Dull Carbide Tools Faster Than Aluminum?
Stainless steel is harder, work-hardens as you cut it, holds heat at the tool tip instead of carrying it off in the chip, and tends to gall and build up on the tool rather than shearing cleanly away. Aluminum does almost none of that, so a carbide tool that lasts a full shift in 6061 can wear out in
What Causes Tool Deflection and How Do You Know It's Happening?
Tool deflection is the cutting tool bending under load instead of cutting exactly where it's commanded. You can usually see it before you can measure it: a wall that tapers instead of running straight, a pocket bottom with a bigger radius than programmed, or a finish pass that looks fine near the to
How Do You Fixture Thin-Walled Parts for Milling Without Them Flexing?
Support the wall as close to the cutting zone as you can, clamp with the lowest force that still holds the part, and cut with a strategy that keeps engagement light and consistent rather than aggressive and one-sided. Thin walls fail in fixturing for one of two reasons. They deflect under cutting fo
What's a Solid Starting Point for Feeds and Speeds When Turning Titanium?
Titanium turns best at low surface speed and a relatively high feed rate compared to steel, the opposite instinct from most machinists' first pass at it. Start conservative on SFM, keep the feed healthy enough to avoid rubbing, use plenty of coolant, and adjust from there based on your alloy, insert
Should You CNC Machine or 3D Print a Functional Prototype?
You have a part in CAD, you need five of them that actually work, and the process you pick decides your week.
Why Does Chatter Show Up Even on a Brand-New End Mill?
A new tool removes one variable, but it doesn't remove the others. Chatter comes from the tool-workpiece system vibrating at a frequency the cut can't damp out. A sharp edge doesn't fix a floppy setup, a long stickout, or a spindle speed that happens to sit near a resonant frequency of the machine o