Tag Archive for: Plastic Cutter

Brick Tactical – Featured Customer

How and when did you learn how to operate CNC machines?

Flashback to 2012, I was 12 years old. I was doing YouTube for 2 years at this point and loved custom LEGO accessories and parts. I knew more than the average twelve-year-old on how they were made, but that wasn’t enough, I wanted to make my own. There were companies out there at the time making third-party LEGO accessories, but not what I wanted. I turned to my right-hand man, my grandpa, with any wild project I could think of. My grandpa was a mechanical engineer and manufactured products that required injection molding. By no means did we know a single thing. We both knew that you needed a mold and hot plastic was pushed into the mold, that’s about it. After doing some research, watching YouTube videos. I saw the Taig Desktop CNC and I knew I had to have it. At the time gathering $2,000 for a twelve-year-old was A LOT. I did anything I could to make a few bucks selling some old LEGO sets and hustling. We got the money and we got the machine.

There was this exciting moment of assembling it and getting to manually jog the machine around and see it move. Another moment that my grandpa and I had, where we just looked at each other like “now what”. You have to keep in mind, we didn’t know what an endmill, CAD/CAM, or even a parallel was. It took about a year of phone calls, YouTube videos, and learning to finally start making usable injection molds. My grandpa would be calling tool reps during business hours and writing down everything he learned. While I would go to school and design molds in my head and on my homework in class. Then we would meet up frequently and exchange knowledge and ideas, and then test it out on the machine.

What struggles did you encounter when you first started learning?

At the time learning all the terminology was difficult. The main thing we had to learn was the difference between an end mill and a ball mill. Sounds silly right? I know pretty pathetic. But making injection molds with nice 3d surfaces we kept getting “stair-step” tool paths and we couldn’t figure it out. Eventually, we realized what the benefits of both were. Back then another concept we both had to wrap our heads around was the concept of a thou. We as machinists have this idea in our heads of what .001″ is. That took some time to get the hang of. Lastly, in 2016 (at sixteen years old) I decided to start going to college for machining. I went to Lake Washington Institute of Technology, my local technical school. I graduated with my AA in Machine Technology and my High school diploma in 2018 when I turned 18. After going through school getting a more formal education on machining, I was hooked! It made me realize my drive for more accurate parts and tolerances. My desktop machine wasn’t enough. In 2018, I bought a Haas DM2 which was a HUGE deal at the time. I paid in cash for this machine. Worked on my company through the previous years. Invested money on the side, and also took on a second job as a CNC programmer. This allowed me to stash all the money away for this purchase. Being able to lean on the Z column of my machine and watch an indicator move .010″ was no longer an issue. I was set.

Where did your passion for Lego’s and Lego bricks come from?

As a kid, I was always around LEGO. Starting at age 5 I got my first LEGO Star Wars set, which I still have to this day. Ever since then I always loved the brick system. Being able to have FULL creative control is something I latched onto early on in my childhood. The rest is history. It turned from a childhood toy, into a hobby, into a small business, now into a real company. It’s crazy to think almost 12 years ago I was a ten-year-old kid starting my YouTube channel, clonetrooperx39. Now going into 2022 I’m looking to hire my first employee at twenty-one years old.

What’s your favorite Lego build you have ever made?

My favorite MOC (My Own Creation) has to be a World War II DDAY recreation. I build this over the course of ten months on my YouTube channel. In this series I started from scratch, looking at historical photos and documents of the world-famous battle known as DDAY. From there I started with some blank LEGO baseplates and got to work. Doing layout work, rock structures, bunkers, tanks, custom printed mini-figures the whole nine yards. Being a total history nerd, this is by FAR my favorite build. It was one of my favorite battles to study growing up in school.

What sets Brick Tactical apart from the rest of the competition?

BrickTactical is all American and I’m very proud of that. We manufacture everything in the United States. A few products I have injection molds for that are too large to run on my current machines, but I have a local Washington state company run them. With BrickTactical you’re not only getting quality products from people who care but you are supporting my story. BrickTactical is very passionate about what we do. We take serious pride in the attention to detail and quality we withhold. Most of the competitors in the custom LEGO accessory world produce all their products overseas. There is nothing wrong with that. I rather do it here and support my friends and family with work along with controlling all the quality myself.

Can you explain the process of creating a custom Lego brick or accessory?

Creating a new custom LEGO weapon/accessory is no easy task. Start off with the idea. Once I have an idea of an item I want to scale down and make into a LEGO mini-figure scale then I get a file designed of that part to scale. Sometimes I do this myself, other times I have one of my designers take care of that. Once I get the file, I normally do a high-resolution SLA 3D print of the part to make sure everything looks and feels right in the mini-figures hand. I might send pictures back and forth with my designer and make changes. This process can take a few weeks to many months depending on the part. Then I take the part file, and I start designing the injection mold. Once designed I program the mold myself and machine it out on my CNC mill. Machining the molds can take many hours, sometimes up to 48 hours straight of machining time to cut the cavities. Then it goes into the molding machine, and we start testing. Sometimes you can get to this step and find a problem and have to repeat this entire process. I do it more than I’m willing to admit, simply because I really care about the little things, some of the things NOBODY would EVER notice, but I notice, so it needs to be fixed. Period. If all is well then it goes into production, and we start cranking them out. The last step is to take photos to list them on the website and promote it!

What current product offerings do you have?

BrickTactical has well over 750+ products currently on the website. We are making dozens every month and plan to ramp up even more in 2022. We offer everything from custom injection-molded weapons/accessories or custom printed genuine LEGO parts with our own designs on mini-figures to create accurate representations of soldiers, video game characters, or movie characters from all time periods.

What sort of machines do you use in your shop?

Currently, we have our main Haas DM2 CNC mill along with our injection molding machines and UV printer. In 2022 we plan to add more UV printers, a robot arm for machine tending, and a 5th axis machine for more complex parts.

Which materials do you most often work with in your shop?

The most common materials that I work with are Aluminum and ABS plastic. Making molds almost every day and then running through the injection molding machines I have are the two materials I’ve gotten to know very well. I also have to occasionally modify steel molds, or make tooling and fixtures out of other materials. But who doesn’t like aluminum! Strong, lightweight, and fast to the machine! Not to mention a LOT cheaper than EDM cutting steel molds.

What is the coolest project you have worked on?

During the early stages of the pandemic, there was a huge need for face shields to protect health care workers. This was an extremely rushed situation, myself, another local machinist, and YouTuber John SL, worked together to fix this. John designed the face shield frame and I took care of the rest. I designed a full injection mold, machined it, and was making parts in less than 10 days. We made around 4,000 of these frames and donated them all to local workers. I always try to do the right thing where I can, this just felt right and I learned a lot from doing it.

Why is high quality tool performance important to you?

High-quality tools are very crucial to making high-quality injection molds. They go hand and hand. Being a solo entrepreneur I also don’t have the time to check lower grade tooling to make sure it’s up to my standards of run out, sharpness, etc. Buying from high-quality tooling companies takes those variables out of the equation. Also having speeds and feeds ready to go when buying new tools saves time and broken tools. It at least gives me a baseline of where to start playing with my numbers.

What is your favorite project you have worked on?

Once I got my Haas DM2 I knew I could make better injection molds. But I also was eager to make some other parts for companies and see how a job shop truly functions. Also, to be blunt I wanted to make some money! After blowing all that cash upfront on a machine my bank account could use it! I found some local customers through word of mouth and started making some small, complex, six-set-up parts on my 3 axis machine. Truth be told after doing work for this company for almost a year they later told me all the parts I had made went on the dashboards of Black Hawk Helicopters. That blew me away being a totally military nerd. That was pretty cool. It was also pretty rad when I’m working with the engineers at this company giving them feedback on how they could modify their designs to make them more machine friendly. Being eighteen years old talking to seasoned engineers, more or less changing THEIR parts, looking back on it was pretty bold.

One time I did a large batch of parts for this company, numerous part numbers, thousands of dimensions that they had to inspect each and everyone due to these being aerospace parts. I remember the head engineer came over to my parent’s house where I have my shop and he told me that every, single, part was perfect and that he hadn’t seen a success rate like that in all 30+ years of him doing this. There I was an 18-year-old fresh out of school, full-time working for myself crushing it.

What is your favorite part of your job?

Having ultimate creative freedom is something I love. Being able to solve problems my way, fix things my way and come up with crazy ideas and products on my own time is truly one of the perks of being self-employed in manufacturing. Knowing how everything around you is made is mind-blowing but also so much fun to think about. Coming up with systems and processes to execute a task is very rewarding to me.

Is there a time that Harvey Tool or Helical Solution products came through and helped your business?

Harvey Tool and Helical cutting tools are always in my shop. The quality you get when buying is unmatched for the price. It’s really that simple. Having a local distributor driving distance away also allows me to save on shipping time. I’ve also come across crazy features on parts when doing job shop work and calling up their customer service and sending them a part file we can go over it in real-time and they always help me find that special tool that can save on my cycle time or reduce setups.

If you could give one piece of advice to a new machinist ready to take the #PlungeIntoMachining, what would it be?

Go for it! There are truly NO EXCUSES in this day and age. Even when I was learning all this, YouTube had nowhere near the amount of content on CNC machining that it does now. Back then I didn’t have Fusion 360 which is extremely powerful. If I can do it, so can you.

Is there anything else you would like to share with the In The Loupe community?

Anyone with passion and drive can do whatever you want in life. If you want to stick a CNC machine in your garage and someday have a giant shop full of machines and staff, you CAN do that. It takes time, grit, risk, and dedication, but look at me for an example. If anyone needs help with manufacturing of any kind feel free to reach out through my website or Instagram, I would be happy to help! Whether that’s trying to pick the right machine for you or even making parts for you I would love to talk!

If you want to get some kick-ass custom LEGO mini-figures and accessories feel free to check out my site BrickTactical.com or follow my Instagram @bricktactical and @bricktacticalmfg

How Material Specific Tooling Pays Off

A machinist is faced with many questions while selecting the proper tool for their job. One key decision that must be made is whether a material specific tool is appropriate and necessary for the application that’s going to be performed – whether the benefits of using this type of tool outweigh the higher price tag than that of a tool designed for use in a variety of materials. There are four main categories to consider when deciding whether a material specific tool is your best bet: internal tool geometry, coatings, material removal rates (MRR), and cost.

When to Utilize Material Specific Tooling

Are you a machinist in a shop that deals primarily with one type of material? Or, do you generally change materials frequently throughout the day? Further, how many parts do you make at a time? These are questions you must ask yourself prior to making a tooling decision.

Material Specific Tooling is best utilized where several parts are being machined of the same material. For instance, if your shop is machining 1,000 plastic parts, it would be in your best interest to opt for a tool designed for this material as your tooling would not only last longer but perform better. If machining flexibility is paramount for your shop, if you’re only machining a few parts, or if part finish is not of high importance, a regular end mill may suffice.

Pros and Cons of Material Specific Tooling

There are pros and cons to purchasing a Material Specific Tool.

Pros:

  • Tool geometry designed for the material you’re working in to achieve the best results.
  • Coating optimized for the material you’re cutting.
  • More aggressive speeds and feeds, and boosted MRR as a result.
  • Increased tool life.

Cons:

  • Higher upfront cost, though long term savings are possible if used in proper situations.
  • Less opportunity for flexibility. While most end mills may be suitable for use in many jobs and many machines, Material Specific End Mills are engineered for use in specific materials

Special Benefits of Material Specific Tooling

A Unique Internal Tool Geometry

Many manufacturers supply tooling designed for use in specific material buckets. For instance, Harvey Tool has distinct catalog sections for material specific tooling for Hardened Steels, Exotic Alloys, Medium Alloy Steels, Free Machining Steels, Aluminum Alloys, Plastics, Diamond Tooling for Non-Ferrous Materials, and Composites. The special geometry of tools found in these sections is optimized to allow the tool to perform optimally in its select material group.

For instance, a machinist may be faced with a dilemma while preparing to machine a plastic part. While an end mill found in Harvey Tool’s Miniature End Mill section could certainly machine this material, Harvey Tool’s end mill offering designed to machine plastics feature a high rake, high relief design. This is ideal for plastics because you want to effectively cut and form chips while the strength of the tool is less of a concern. The high rake and high relief creates a sharp cutting edge that would quickly break down in metals. However, in plastics, this effectively shears the material and transfers the heat into the chip to produce a great finish in your part.

material specific tooling

Harvey Performance Company, LLC.

Specific Coatings & Substrates for Optimal Performance

One key benefit of opting for a material specific tool is the ability to utilize the best coating option available for that material. Tool coatings serve many functions, including improved lubricity, increased tool life, and a higher-quality part finish. In addition, coated tools can typically be run around 10% faster than uncoated tools.

While many manufacturers will specially coat a standard end mill at your request, this takes added time and cost. In its Material Specific catalog sections, Harvey Tool offers coated tools stocked and ready to ship. For instance, their Hardened Steels and Exotic Alloys categories utilize AlTiN Nano coating. This is a unique nanocomposite coating that has a max working temperature of 2,100° F and shows improved performance in materials such as Hardened Steels, Titantium Alloys, and Inconel, among others.

Increased Material Removal Rates

Because Material Specific Tooling features optimal tool geometry for a job, running parameters are generally able to be more aggressive. Any machinist knows that Material Removal Rates (MRR), is the metric that’s most closely related to shop efficiency, as the more material removed from a part in a given period of time, the faster parts are made and the higher the shop output.

The following example compares running parameters of end mills from Harvey Tool’s Miniature End Mill and Material Specific End Mill Sections. You can notice that while key geometries between the two tools are identical, and are in use in the same material with the same operation, the chip load (+25%), linear feed rate (+33%), and depth of cut (+43%) are boosted. This allows for more material to be removed in a shorter period of time.

Miniature End Mill

Part Number: 836408

Description: 3 Flute 1/8 inch diameter 3x LOC Square Stub & Standard

Material: 6061 Aluminum

Application: Slotting

Speed: 10,000 RPM

Chip Load: .00124 IPT

Linear Feed: 37.2 IPM

DOC: .04375

Material Specific End Mill

Part Number: 942308

Description: 3 Flute 1/8 inch diameter 3x LOC Square Variable Helix for Aluminum Alloys

Material: 6061 Aluminum

Application: Slotting

Speed: 10,000 RPM

Chip Load: .00165 IPT

Linear Feed: 49.5 IPM

DOC: .0625

Harvey Performance Company, LLC.

Extensive Cost Savings

The following chart displays a cost analysis breakdown between a tool found in the Miniature End Mill section, item 993893-C3; and a tool found in the Material Specific End Mill section, item 933293-C6. When compared for the machining of 1,000 parts, the overall savings is nearly $2,500.

material specific tooling benefit chart

Material Specific Tooling Summarized

In conclusion, Material Specific End Mills have many benefits, but are best utilized in certain situations. While the initial cost of these tools are higher, they can work to save your shop time and money in the long run by lasting longer and producing more parts over a given period of time.

Selecting the Right Plastic Cutting End Mill

Many challenges can arise when machining different types of plastics. In the ever changing plastics industry, considerations for workholding, the melting point of your material, and any burrs that may potentially be created on the piece need to be examined prior to selecting a tool. Choosing the correct tool for your job and material is pivotal to avoid wasting time and money. Harvey Tool offers One, Two, and Three Flute Plastic Cutting End Mills with Upcut and Downcut Geometries. The following guide is intended to aid in the tool selection process to avoid common plastic cutting mistakes.

Choose Workholding Method

When it comes to workholding, not all plastic parts can be secured by clamps or vices. Depending on the material’s properties, these workholding options may damage or deform the part. To circumnavigate this, vacuum tables or other weaker holding forces, such as double sided tape, are frequently used. Since these workholdings do not secure the part as tightly, lifting can become a problem if the wrong tool is used.

Downcut Plastic Cutting End Mills — tools with a left hand spiral, right hand cut — have downward axial forces that push chips down, preventing lifting and delamination. If an Upcut Plastic Cutting End Mill is required, then a tool with minimal upward forces should be chosen. The slower the cutter’s helix, the less upward forces it will generate on the workpiece.

plastic cutter selection

Determine Heat Tolerance

The amount of heat generated should always be considered prior to any machining processes, but this is especially the case while working in plastics. While machining plastics, heat must be removed from the contact area between the tool and the workpiece quickly and efficiently to avoid melting and chip welding.

If your plastic has a low melting point, a Single Flute Plastic Cutting End Mill is a good option. This tool has a larger flute valley than its two flute counterpart which allows for bigger chips. With a larger chip, more heat can be transferred away from the material without it melting.

For plastics with a higher heat tolerance, a Two or Three Flute Plastic Cutting End Mill can be utilized. Because it has more cutting edges and allows for higher removal rates, its tool life is extended.

plastic cutter selection

Consider Finish Quality & Deburring

The polymer arrangement in plastics can cause many burrs if the proper tool is not selected. Parts that require hand-deburring offline after the machining process can drain shop resources. A sharp cutting edge is needed to ensure that the plastic is sheared cleanly, reducing the occurrence of burrs. Three Flute Plastic Cutting End Mills can reduce or eliminate the need to hand-deburr a part. These tools employ an improved cutting action and rigidity due to the higher flute count. Their specialized end geometry reduces the circular end marks that are left behind from traditional metal cutting end mills, leaving a cleaner finish with minimal burrs.

Shop Harvey Tool Plastic Cutting End Mills Today

Flute Count Case Study

2 FLUTE PLASTIC CUTTER: A facing operation was performed in acrylic with a standard 2 Flute Plastic Cutting End Mill. The high rake, high relief design of the 2 flute tool increased chip removal rate, but also left distinct swirling patterns on the top of the workpiece.

3 FLUTE PLASTIC FINISHER: A facing operation was performed on a separate acrylic piece with a specialized 3 Flute Plastic Finisher End Mill. The specialized cutting end left minimal swirling marks and resulted in a smoother finish.

plastic cutter selection

Identifying the potential problems of cutting a specific plastic is an important first step when choosing an appropriate plastic cutter. Deciding on the right tool can mean the difference between an excellent final product and a scrapped job. Harvey Tool’s team of technical engineers is available to help answer any questions you might have about selecting the appropriate Plastic Cutting End Mill.

plastic cutter selection