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Ball Bearings for Lead Screws and Linear Motion

All dimensions shown relate to the inner diameter of the ball bearing. Typically two bearings are needed for each lead screws (axis). If a three axis machine is being built, six bearings will be needed. The ball bearing size will depend on the lead screw diameter. The lead screw diameter must match the inner diameter of the ball bearing. For linear motion, 5/16" ball bearings are used. Please read the conditions of purchase prior to purchasing any products offered by BuildYourCNC.com.

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3/8" Shim Washer for Bearings (.39"x.625"x.06")

$0.49
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The 3/8" shim washer is a vital piece of hardware that will allow the outer bearing race to spin freely while the inner bearing race remains stationary and vice versa.

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

$7.20
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These are typical skate bearings that we use for our linear slide rail bearings.

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Single 1/2" ID Bearings

$2.50
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Use these bearings to stabilize your 1/2" lead screw next to the coupling. Two per axis is usually needed to secure the entire lead screw.

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Single 1/4" ID Bearing

$1.50
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Use these bearings to stabilize your 1/4" lead screw next to the coupling. Two per axis is usually needed to secure the entire lead screw.

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Single 3/8" ID Bearing

$2.60
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These bearings can be used for any shaft or screw that measures 3/8". We used these to allow 3/8" lead screws to be rotated.

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Single 5/8" ID Bearing

$3.50
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Use these bearings to stabilize your 5/8" lead screw next to the coupling. Two of these bearings are typically used for each lead screw, one bearing at each end of each lead screw.

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Linear Ball Bearing Block 20mm

$9.99
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These 20mm Linear Ball Bearing Blocks are made to fit on our 20mm Linear Guide Rails.

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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.

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3/16" V-Groove Bearing

$9.98
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These are specialized bearings that are used in many linear motion systems. The v-groove bearings generally ride on a rail or track. #10 Screws fit well with the inside diameter of this v-groove bearing.

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Single V-Groove Bearing

$11.75
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