Thrust Bearings

[chas]

Not completely sure how a typical thrust bearing
assembly would look like. Does anyone have a
cad drawing to enlighten me.
Thanks

[High Seas]

Maybe this helps - a quick rip from Mcmaster's catalog (more at: www.mcmaster.com)
Cheers - Jim

[sendkeys]

[ger21]

Are you talking about for a leadscrew? Check out these: http://www.nookind.com/endmount/EndMountsFlange.cfm

or here for a home made version: http://www.5bears.com/cnc04.htm

[chas]

So to ask a stupid question, they go between the end of the leadscrew(stepped edge)
and the bearing, opposite end from the step motor?

[sendkeys]

well thrust bearings goes


screw-thrust-bracket-thrust-washer-nut-coupler to servo/stepper


and frist thrust is smashes in the middle of the screw edge and bracket

the bracket is just little bigger then the screw so it can turn free or maybe use a smaller normal bearing(cheaposkate bearing ect) in the middle of the two thrusts and tight on the bracket. this would give you more up/down support. just make sure it doesnt touch side to side only up/down. Like use .3 inch thick bearing and .4 inch bracket ect

then last thrust is smashes on the bracket and washer/nut




i bet in the end this will cost you more then angular contact bearing.
like on the two above websites.

http://www.bearingsdirect.com/cgi-bi...art.cgi?CAT=55

[ger21]

You can make a bearing block like I linked to above using rollerblade bearings, instead of angular contact (which cost a fortune). They won't last as long as angular contact, but they are a fraction of the price and can easily be replaced when worn. And for small routers, they should still last quite a while.

[sendkeys]

http://www.vxb.com/miva/merchant.mv?...NGULAR_CONTACT

""Ball Bearings 17x40x10
Single Row Angular Contact
Axel Bearings
Lot of 10 Bearings ""

for 19.99 cheapest i seen center hole might be to big but for that price you can turn some smaller centers for it hehe

[Patrick2by4]

I guess these would be called angular contact bearings

[HuFlungDung]

Those be tapered roller bearings. Nothing wrong with using those on a low speed app. The principle of having to preload the bearings in pairs, to achieve proper running performance, is the same thing as you'd have to do with real angular contact ball bearings. Angular contact bearings use balls, not rollers. The "angle" of an angular contact bearing is the imaginary line of contact of the ball through the inner and outer races. Its not radial contact, but a few degrees off each side of the radial contact point. There, is that enough to muddy the waters up good?

[Patrick2by4]

I will be using these bearings on my y-axis. It will be spinning about 600~800 max. Hopefully I won't have any problems.

[High Seas]

I'm confused? So let me review, what is the question:

Originally Posted by chas So to ask a stupid question, they go between the end of the leadscrew(stepped edge) and the bearing, opposite end from the step motor?

ANSWER
First: Not a stupid question.
Second: Yes, they can go at the opposite end of the motor - and you'd probably want a bearing that works in both lineal (along the rod direction) to support the rod pushing against the end plate, and radial (around the rod) supporting the shaft as it rotates.
Third: The angular contact looks like a good alternative - and the other thrust bearings have their uses as offered - does that help any?
Forth: Personally, I'm looking at the lower cost filled nylon bearings for the far end of the rod, and just keep a few on hand and replace as needed. I like the 5bears approach too. Hadn't considered beadings at the motor end - so this has all given me something to think about. Thanks guys!
Jim