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Question #: 13519

Question: What is the load rating for the Linear Ball Bearing Block 20mm (0.78")?

Current Solution

The dynamic load ratings for our 20mm linear round rail blocks are 880 kgf . The static load rating is 1370 kgf.

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Other Possible Solutions to this Question

• how much static and dynamic load can the Linear Ball Bearing Block 20mm take?

The dynamic load ratings for our 20mm linear round rail blocks are 880 kgf . The static load rating is 1370 kgf.

how much static and dynamic load can the Linear Ball Bearing Block 20mm take?

• Can you provide additional dimensional or CAD data for the 20 mm linear ball bearing block and matching guide rail (overall size, mouting hole locations, etc)?

For our 20mm linear ball bearing block dimensions:
L: 1.9795"/ 50.2793mm
W: 1.9055"/ 48.3997mm
H: 1.4810"/ 37.6174mm
The mounting holes will be 1.3500" apart from each other.

The 20 mm guide rail (as sold), dimensions:
L: 11"/ 279.4mm
W: 1.7825"/ 45.2755mm
H: 1.4655"/ 37.2237mm
Mounting holes will be in the center of the 11" piece and be 5.9120"/ 150.1648mm apart with around 2.5"/ 63.5mm of rail on each side.

• what are the dimensions of the pillow blocks for the round linear guide rails?

Are you referring to this part?: https://www.buildyourcnc.com/item/mechanical-rails-linear-ball-bearing-block

yes that block

I created a drawing of the linear bearing guide block that shows the dimensions that you need for mounting. Specifically, the mounting spacing is 1.38 inches both axially and transversely.

You can see the drawing on the linear bearing guide block page here: https://www.buildyourcnc.com/item/mechanical-rails-linear-ball-bearing-block

And directly here: https://www.buildyourcnc.com/images/20mm%20bearing%20guid%20block%20for%20round%20rail-800.JPG

If you need further information, please let me know. Thanks.

what are the dimensions of the pillow blocks for the round linear guide rails?

• What are the technical details/dimensions for the 20mm Linear Guide Rail?

For our Hiwin rail, you can find the specifications at this URL:
https://www.buildyourcnc.com/item/mechanical-rails-HIWIN-Linear-20mm-Guide-Rail

For our standard round linear rail, you can find the specifications at this URL:
https://www.buildyourcnc.com/item/mechanical-rails-linear-guide-rails-20mm

What are the technical details/dimensions for the 20mm Linear Guide Rail?

• What is the width and height of the round Linear Guide Rail 20mm? Specs are not listed on the product page.

I just updated the Linear 20 mm Round Rail product page to reflect these measurements. https://www.buildyourcnc.com/item/mechanical-rails-linear-guide-rails-20mm

For your convenience, here they are:

Overall Height of Rail and Base: 37 mm (1.46 in)

Width of Base: 45 mm (1.77 in)

Mounting Holes on Center Widthwise: 30.226 mm (1.19 in)

Mounting Holes on Center Lengthwise: 150 mm (5.9 in)

If you need further information, please don't hesitate to ask be responding to this FAQ. Thanks.

• What is the runout on the 2.5 KW spindle and how many bearings?

The runout on our 2.2kW spindle and number of bearings are:
Radial runout: 0.01mm - 0.000393701 inches, 3 Bearings

What is the runout on the 2.5 KW spindle and how many bearings?

• Hi, I need the lead screw and bearings for x/y/z axis of the CNC. What is the length of "1/2" Lead Screw per inch (Steel)"?

Depending on the size of your CNC machine, it will vary the length required for your application.
Please verify the CNC machine, and we can go into detail on the specific lengths or methods for the linear guide mechanics.

We sell our ACME Screw (1/2" per inch), also our longest length of ACME Screw is 76-3/4".

• What steppers are required for the X, Y, and Z axis of the scratch build kit? Do they all need to be the same rating?

The required motors are the 425 oz-in stepping motors, would be the required motors to run the machine efficiently.

• How do I specify multiple quantities of custom cut lengths of the linear bearing guide?

Purchase the total length of the product that interests you (i.e. the linear bearing guide) and call us to inform us how you would like it cut. The phone number is located at the top right of each web page by hovering over the "Need Help?" message.

How do I specify multiple quantities of custom cut lengths of the linear bearing guide?

• What grease should be used on Hiwin linear rails and blocks?

You will want a grease that can be used in high temperature and heavy load situations also called high load bearing grease. A simple google search will yield many results from which to choose. We plan to carry this product in the near future (by the time you read this, we may already carry it).

What grease should be used on Hiwin linear rails and blocks?

• What is a normal max operating temperature for a 2.2kw water cooled spindle?

I don't know the exact temperature, but the spindle actually needs to get to a relatively high temperature for normal operation and to protect the bearings. IF I find better information from our supplier, I will add this information to this answer.

What is a normal max operating temperature for a 2.2kw water cooled spindle?

• What are the hole spacing dimensions for the Linear Guide Rail 20mm? I'm trying to figure out what size aluminum extrusion to purchase so I can mount these to it.

Our SBR20 rails use M8 bolts and are suitable for use with 8020 aluminum or any other common machine material. We suggest the use of our ball bearing pillow blocks with these rails, which you can find on our website here: https://buildyourcnc.com/item/mechanical-rails-linear-ball-bearing-block

HOW TO FIND WIDH 38 HEIGHT 26 LINER GUIDE RAIL

• What are the bolt dimensions for the SBR20 linear rails, can they work with 8020 Aluminum extrusions?

Our SBR20 rails use M8 bolts and are suitable for use with 8020 aluminum or any other common machine material. We suggest the use of our ball bearing pillow blocks with these rails, which you can find on our website here: https://buildyourcnc.com/item/mechanical-rails-linear-ball-bearing-block

HOW TO FIND WIDH 38 HEIGHT 26 LINER GUIDE RAIL

What are the bolt dimensions for the SBR20 linear rails, can they work with 8020 Aluminum extrusions?

• What are the actual measurements of the 5/8 and 1/2 ID bearings?

The dimensions for each bearing (5/8" and 1/2"):
1/2": OD 1.1255" - 28.5877mm / height 0.3150" - 8.001mm

5/8": OD 1.3750" - 34.925mm / height 0.3440" - 8.7376mm

What are the actual measurements of the 5/8 and 1/2 ID bearings?

• What is the weight of the linear guide rails?

This is a good question. I will weigh this part when I get into the office on Monday.

What is the weight of the linear guide rails?

• Have your 20mm rail and blocks. Is there a special grease that you recommend for the blocks or is general chassis lube OK?

You can use grease, low-viscosity grease or oil. Your application may need to be considered.

Here is a document on the lubricating instructions from HIWIN:
https://www.hiwin.com/pdf/lubricating_instructions.pdf

Section 4 of this document relates specifically to the lubrication of linear guideways like the ones we carry.

• I want to order 8 HIWIN Linear Guide Blocks. Is there a cheaper shipping option? \$70 is too much for something that weighs less than 5 lbs. I live in the continental US

Prices on amazon are fixed costs for shipping. The website generally reports high costs for international shipments but we can give you a better quote if you care to email sales@buildyourcnc.com

• Is the 4kv spindle constructed using two or four bearings and what size collets are included with the spindle/vfd combo?

Yes, all of the spindles come with collets. The collets have a 1/4" (6.35mm) bore for end mills that have a 1/4" shank. The ER specification is different for the 1.5kW (ER-11) and the 2.2kW (ER-20).

• What are the other two dimensions of the 1/2" ID bearings used to support lead screws?

Inside Diameter: 1/2" (actual dimension 0.4975 inches or 12.63 mm)

- Outside Diameter: 1.122 inches or 28.4988 mm

- Thickness: .31 inches or 7.89 mm

Thank you for this question as it caused me to update the description:
https://www.buildyourcnc.com/item/bearing-!5-standardbearing

What are the other two dimensions of the 1/2" ID bearings used to support lead screws?

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