The hardest part of making these shorts isn’t coming-up with topics, it’s trying to be consise within 15 seconds and not ramble on with other info… it’s quite a skill that takes a lot of time to get over. I’m trying to summarize 20 years of CNC design through fabrication knowledge into 15 second bits, so far, not succeeding very well but always onto the next short!
Best Welders for Beginners
Before buying your first welder, consider purchasing a good used machine instead of a brand new one. Many quality welders last for years, making used equipment an excellent value for beginners. You can often get a better machine with more features for the same budget. Inspect it carefully, test it if possible, and buy from a reputable seller. Saving money on your first welder lets you invest more in safety gear, consumables, and practice materials.
Downdraft vs Water Table: CNC Plasma
A downdraft table is generally the better choice for most CNC plasma cutting shops because it removes smoke and fumes immediately, keeping the work area cleaner and improving visibility while cutting. Water tables excel at reducing heat distortion and capturing fine dust, making them ideal for thinner materials. The best option depends on your priorities, but if fume control and shop cleanliness are most important, a downdraft table is often the better investment.
The Challenges of using VERY LONG ENDMILLS!
Long endmills are often necessary for machining deep molds, but they come with tradeoffs. Their limited geometry options and high cost can make tooling expensive. The biggest challenge is tool deflection, where the cutter flexes under load, affecting accuracy, surface finish, and overall cutting performance. Using a rigid CNC machine, quality tool holders, and carefully adjusting feeds and speeds helps minimize these issues. For extremely deep pockets, machining parts in stacked sections can reduce tool length requirements while introducing additional tolerance considerations.
Can You Make Just ONE More?
Large production runs often seem finished until a customer calls weeks or months later asking for “just one more” part. If no extras were produced during the original run, setting up the machine again for a single piece can be costly and time consuming. Manufacturing a few additional parts during the initial production run is often inexpensive and can save significant setup time, reduce costs, and improve customer service when unexpected replacement or expansion orders arise later.
My First Welding Machine
My first welding machine was a Lincoln Electric AC Tombstone, and it remains an excellent choice for beginners. Simple, reliable, and built to last, it performs well with 7018 and 7014 stick electrodes. While 120 amps is commonly recommended for 1/8 inch rods, I prefer running slightly hotter for better puddle control and smoother welds. Every welder develops their own preferences over time, proving that quality welds come from skill and experience, not just expensive equipment.
Do the trades make your hands tougher?
Years of working in the trades may leave your hands with calluses, but they do not make them indestructible. Whether you’re a welder, machinist, fabricator, or carpenter, your skin may become tougher from repeated use, but cuts, burns, and injuries happen just as easily. Experience teaches better habits and safer work practices, not superhuman toughness. Respect your tools, wear the proper protection, and remember that even seasoned tradespeople can get hurt.
Tool Deflection: Why Your CNC Cuts Wrong
Tool deflection is one of the most common reasons CNC parts end up out of tolerance. As cutting forces increase, a long or undersized endmill can flex, causing poor surface finish, inaccurate dimensions, and chatter. Reducing tool overhang, selecting the largest practical cutter, and optimizing feeds, speeds, and depth of cut all help minimize deflection. Understanding how tools behave under load is essential for producing accurate, repeatable parts and extending tool life.
Glue is to Wood what a Weld is to Metal
A strong wood glue joint is often just as impressive as a quality weld on metal. When properly prepared and clamped, the glue bond can be stronger than the surrounding wood itself, causing the wood to fail before the joint does. The same principle applies to welding, where proper preparation and technique create the strongest connection. Whether you’re working with wood or steel, success depends more on craftsmanship than simply applying glue or laying down a weld.
The Hidden Danger of Wire EDM
Wire EDM is one of the safest machine tools in a shop, but dried metal particulate is an often overlooked hazard. During machining, microscopic particles are captured in the dielectric water and filtration system. The risk arises when sludge or used filters dry out, allowing fine dust to become airborne during maintenance or cleanup. Proper housekeeping, careful filter handling, and safe disposal practices help minimize inhalation exposure and create a cleaner, healthier work environment for EDM operators.
Why Cutting Fluid Smokes (And Ruins Your Tools)
Smoke coming from cutting fluid during drilling or CNC machining is usually a warning sign that excessive heat is being generated at the cutting edge. This can result from dull tooling, incorrect feeds and speeds, poor chip evacuation, or insufficient coolant flow. Ignoring the smoke can shorten tool life, damage the workpiece, and reduce machining accuracy. Identifying the cause early and correcting the machining parameters helps improve surface finish, extend tool life, and maintain consistent production quality.
Never Leave This Running Overnight
Leaving a CNC machine running unattended overnight may seem like a way to boost production, but the risks far outweigh the rewards. A failed bearing, electrical fault, loose connection, or unexpected fire can destroy an entire shop in a matter of hours. Even reliable equipment can fail without warning. Staying present while machines are operating allows you to respond quickly to problems and helps protect your business, equipment, and years of hard work.
Accidentally Hit E Stop?
Accidentally hitting the emergency stop is something almost every CNC operator experiences at some point. The key is to stay calm and avoid rushing to restart the machine. First, determine why the E-stop was pressed, verify the machine and tooling are safe, then reset the control and carefully resume operation. Taking a few extra moments to inspect the setup can prevent damaged tools, scrapped parts, or machine crashes. Even experienced machinists occasionally hit the E-stop by mistake.
Never Open the Lid if This Happens
If smoke suddenly fills the enclosure of a CNC laser cutter, never open the lid immediately. Opening the enclosure allows a rush of oxygen to feed a potential fire, turning a small flare-up into a much more dangerous situation. Instead, stop the machine, keep the lid closed, and allow the fire suppression system or extinguisher to do its job if needed. Understanding this simple safety rule can help prevent serious equipment damage and protect both operators and the shop.
Don’t Be the Midnight CNC Doctor
If your CNC machine suddenly starts making an unusual noise during a job, don’t ignore it or hope it goes away. Pause the machine, inspect the tooling, spindle, workholding, and cutting area to identify the cause before continuing. Restart at a reduced feed rate and listen carefully for any recurring problems. A few minutes of troubleshooting can prevent broken tools, damaged parts, or costly machine repairs. Good machinists solve problems early instead of becoming the midnight CNC doctor.
Absolute vs Relative Positioning
Understanding the difference between absolute and relative positioning is fundamental to CNC programming. In absolute mode, every coordinate is measured from a fixed program zero, making toolpaths easier to read and troubleshoot. In relative (incremental) mode, each movement is based on the tool’s current position, which is useful for repetitive patterns and certain machining operations. Knowing when to use each positioning method helps prevent programming errors, improves efficiency, and produces more accurate CNC parts.