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  • blueChick v. 4.2 CNC Machine
    Available in two sizes 1'x3' and 1'x2' routing areas.
  • Mechanics to Minimize Backlash
    Running on tensioned roller chain to eliminate backlash and small drive sprockets to increase mechanical precision.
  • Cable Carriers
    Perfectly manage the cables and hoses with these cable chains.
  • greenBull CNC Machine
    If you need BIG, we've got BIG. Available in 5 foot and 6 foot widths. Make it as long as you want!
  • Spindles and VFDs
    1.5 kW, 2.2 kW and 4.0 kW available. Also see our 1/8", 1/4" and 1/2" ER-20 Collets
  • blackTooth Laser Cutter and Engraver
    New and coming very soon, lasing all kinds of materials.
5/6

These package counts are based on the common machine requirements. Specification: 5/16" inner diameter, approximately 1/4" thick, and the outside diameter is approximately 7/8".

Related Tutorials

Skate bearings Step 1 - Linear Slide Bearings
This tutorial is dated, if you are considering a CNC for your personal use, we would highly recommend purchasing a kit that is very stable from our wide range of machines available. If you are looking for great linear slide bearings, see here. Through much of my research on homemade CNC machines, I found that the mechanism to provide linear sliding is simply the use of an angle ("L" shaped piece of metal), bolts or screws (5/16" at 3/4" in length), nuts (5/16") and standard skate bearings (I use ABEC7/608Z). The design is actually very efficient and clutter free. When I say clutter free, I mean that the exhaust of sawdust that the CNC will produce will not clog up these bearings. Collar bearings, or bushing bearings I believe will have the tendency to receive material within the bearing housing creating a binding effect. If you are wondering what a bearing bushing is, imagine a cylindrical tube with little balls housed on the inside surface of the tube. The skate bearing method is like creating a new kind of hybrid inline skates and those skates you used in the 80's with the four wheels (coming back into style, why?!?).
Step 12: Gantry Linear Slide Bearings
This tutorial is dated, if you are considering a CNC for your personal use, we would highly recommend purchasing a kit that is very stable from our wide range of machines available. Hey, where did that day go?? Man, time is a passin' and I just can't keep up. Well, today you will see the slide bearings for the gantry. These are very long linear slide bearings. They are long for a good reason. First, the gantry is big. Second, the gantry is heavy. Third, the gantry is made of MDF. Fourth, the gantry is made by HAND! Oh, did I say that the gantry is heavy??
pipe linear slide thumbnail Pipe CNC Step 1: Linear Slide Mechanism and Concept
November 22, 2007 Happy thanksgiving for those who live in the United States. This is my first post in the Research and Development section of this website. You are probably wondering why I am adding the pipe CNC machine in such an illusive section. I want visitors of this website to know that this machine is a work in progress and all of the bugs and concepts are not fully known yet. Anyway, this enables me to share some of the ideas that run through my head.
Torque and Linear Motion Formula
Periodically, I get questions from users of the site regarding torque and how much is required to move certain masses and a recent user emailed me specifically and it gave me the happy motivation to add this page. :) These masses are things like the gantry, or the z-axis assembly with the router mounted moving on the y-axis, or the just the router mount and router within the z-axis assembly. The question is usually in the form of, can my ??? oz-in motors be used on your CNC machine.
Alden G's CNC Machine and Narrative
I have seen many builds based on the step-by-step instructions on this site, but when I see the the DIY community start to mix the ideas of one CNC machine with another, I get really excited. To take a machine and introduce concepts from another machine, like timing belt mechanics, is clever and welcome. Alden also is very creative with where he positions the drivers.
Axis Calibration Thumbnail Calibration of Linear Motion System Driven by Stepping Motors
So, you don't have a dial indicator to test the accuracy of your machine. You are finding that your cuts are a little off. You're racking your brain, trying to figure out the issues that are causing this phenomenon.
Octavio's Metal CNC Machine
Octavio went out on a limb and created a metal machine with some very inventive components. Inspired by this website, he was able to get this design and construction going. The machine is truly an example of using components in the machine for efficiency and simplicity. The overall structure appears to be steel. He uses bearings with channels to serve as linear guides. The z-axis mechanism is reversed to enable longer travel. All of this is not the most interesting part. Octavio is a medical doctor. This goes to show that individuals of all backgrounds dabble with this technology. Take a close look at the bearings used to guide along the rail (U groove and V groove bearings work well for this type of linear rail mechanism). I know, you're saying that this method is used on other CNC machines. Sure, but he is positioning the bearings and using minimum hardware to serve multiple purposes. You can see that he is using the same shaft for each pair of bearings. The back bearings (the bearings to the right) glide horizontally along the y-axis and the front bearings serve the z-axis up and down movement. This linear motion mechanics for the y and z axes is very clever. Octavio is currently trying to reduce the gantry weight. He says that the z-axis alone is 50 pounds. He has a goal of 20 pounds by changing the metal to aluminum using stamped parts.
Step 15: Y-Axis Lead Screw
This tutorial is dated, if you are considering a CNC for your personal use, we would highly recommend purchasing a kit that is very stable from our wide range of machines available. Instead of using allthread for the lead screw and a standard nut, consider using a 5 start lead screw and anti-backlash nut. It will keep you from pulling out your hair by running much smoother and faster. You've completed the nut in the last step. What is power transmission without a screw? In this video, I will demonstrate the holes needed for the bearing and nuts for each end and driving the screw. The process is similar to the z-axis lead screw assembly; but the screw is attached at each end. In my opinion, it's not that important to secure both ends of the screw, but you do want to make sure the free end of the screw will not flap around, so some type of mechanism to keep it in place helps.
John S.C.'s CNC Machine and Suggestions
John S.C. did something that I have not yet seen. He applied a ball-screw to the DIY version of the CNC Machine found on the step by step and the book "Build Your Own CNC Machine". Yes, you heard me right! A ball-screw. Why do I sound excited? Read on.
Step 10: Gantry Sides
This tutorial is dated, if you are considering a CNC for your personal use, we would highly recommend purchasing a kit that is very stable from our wide range of machines available. We are moving right along. We will be making the gantry sides in this video. The gantry is the part of the CNC Router that moves along the x-axis. That's what makes this machine a gantry style machine. The gantry allows the router to essentially float over the cutting surface. The gantry sides consists of two boards approximately 18" x 8" 8" linear slide bearings will also be built in a later video to be used in with these gantry sides. The linear slide bearings are longer than the other linear slide bearings on the y and z axes so the weight of the gantry can be supported. The gantry needs to carry the z-axis, router, and the y-axis with all support pieces. In addition, the force of the motors against the force that the bit and cutting imposes on the machine must be handled by the entire gantry.
Step 18: Z-Axis Motor Mount
This tutorial is dated, if you are considering a CNC for your personal use, we would highly recommend purchasing a kit that is very stable from our wide range of machines available. With the Y-Axis Motor in Place, we can now start on the z-axis. I know you're probably thinking, what are those motors and what are its specifications (torque, what that means, wiring, power, etc.)? That information will be made available during the electronics portion of this video series coming up after the x-axis motor mount. And yes, I'm going to bore you with yet another motor mount. The process wouldn't be complete without it.
A DIY CNC Machine in Pipe
I have been doing a lot of tinkering lately (yup, that's why!). I cannot get the mechanical aspect of CNCs out of my system, so until then, enjoy the crazy concoctions.
William L's scratch built CNC machine William L's Scratch Built CNC Machine
Here is a scratch built machine (from the plans or book) that exhibits great workmanship, but more importantly, how some of the construction of the CNC machine was done. William L. used sound techniques to make sure the machine would be constructed as intended, knowing that some of the machine would have various size differences within the sub assemblies that would make some of the measurements within the plans not work.
Mick H's CNC Router Build
Mr. Mick H. He has been following the build and making great progress. He, just like the other fellow builders have added their own enhancements, which really makes them leaders in building these CNC machines. He noticed that the table, at the sixe of 24" x 48" will deflect a little as the gantry reaches the mid point of the table. He took his reinforcement to another level, shall we say he "spiced it up a bit". He also went the gluing route, as opposed to a mechanical fastened build. With his clean and precise workmanship, as noted in the images, it is a very smart way to go. Remember, if gluing is a consideration, your measurements will need to be somewhat precise to insure a tight fit around the rails.
Lucan's CNC Router
I was doing my usual research around the net, you know... to pass some time very late at night, and I came across a member of cnczone.com building one of Joe's CNC machines, and to my surprise, he was using the design from this site. I was very proud to say the least. This CNC router is setup very nicely, with a vacuum attachment and a few other interesting modifications. Lucan has also been cutting out an enormous amount of parts on this machine. He is in real production.

Price Options Your Cart

5/16" Bearings 8 pack (One Axis Set)

$7.20
5/16" Bearings 24 pack Three Axes Set

$20.40
5/16" Bearings 30 pack (Three Axes and two for each 1/2" leadscrew)

$24.00