Skateboard ABEC-7 bearings

[coolman]

I found some ABEC-7 (best accuracy) bearings that are originally for skateboards. They are about $1/each. See the web link below. I plan to use these bearings to build my own bearings & sliding rails. It has a 3.25 KGF dynamic load. My question is what is the load ratings in LBS (US pounds)? Can these bearings handle a 5' x 5' metal mill used to cut steel and aluminum? How do they compare with bearings normally used for metal CNC mills?

http://www.vxb.com/page/bearings/PRO...57e70856323141

[coolman]

<please delete this message>

[jeffs555]

One kgf is equal to 2.2 pounds, so 3.25kgf is a little over 7 lbs. I would say that something is wrong with those specs. Using those specs, a skateboard with 4 wheels and 2 bearings per wheel would be rated for less than 60 lbs, not enough to support a large child even standing still.

[2muchstuff]

That is a good price for those sealed bearings. Regardless of those numbers, I would go ahead and use them. I wonder if they meant those as an axial load. I bet if you look up a standard 608 bearing that you could get an actual rating. Besides most of your loads will be of a radial nature anyway.

[ger21]

Originally Posted by coolman How do they compare with bearings normally used for metal CNC mills?

THK type bearings use on metal mills are rated at several thousand lbs

[mdreitzusa]

coolman,
try these bearing same price and can take a lot more pressure.
1080 lbs static 2148 lbs dynamic
it has 17 mm shaft size.
http://www.vxb.com/page/bearings/PRO...8e55c4d91caa4c

[Apples]

I am using those abec-7's on my plasma table. I have used 4 bearings to support the downward weight of my gantry, which at the moment weighs 45kg, or 100lbs. From memory these bearings can handle about 90kg each i think. Hey, I was sitting on my gantry the other day because I was so excited about actually making the gantry and how good it slides along. I weigh 100kg the gantry weighs 45, so say 150kg which is probably around 330lbs and I tell you what, unbeleviable! I could easily push myself along while I was sitting on the gantry. COOL!

Apples

[WarrenW]

I ordered 100 of those bearings from vbx.com for only $34 this week.