Author Topic: Steel Round Tube For Bearing Housings???....  (Read 470 times)

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Offline Smokey

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Steel Round Tube For Bearing Housings???....
« on: May 13, 2021, 08:46:27 am »
I'm looking to make some custom spindles with tapered roller bearings like these:


1.25"ID, 2.32"OD = https://www.surpluscenter.com/Brands/Dura-Roll/1-25-ID-2-32-OD-0-625-Wide-Cup-Cone-Tapered-Roller-Bearing-Set-Dura-Roll-LM67048-LM67010-1-5524.axd
..and..

1.5"ID, 2.56"OD = https://www.surpluscenter.com/Brands/Dura-Roll/1-50-ID-2-56-OD-0-71-Wide-Cup-Cone-Tapered-Roller-Bearing-Set-Dura-Roll-LM29749-LM29710-1-5534.axd

I feel like turning the bearing housings out of solid 3" round bar is a waste of steel, but I'm not finding any suitable thick wall tube or pipe that's available and less expensive.  I know we are in a steel shortage, but I figured there would be more thick wall tube options in this size range.

What am I missing?  What tube would you make a bearing housing out of for these tapered roller bearings?
 

Offline beanflying

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Re: Steel Round Tube For Bearing Housings???....
« Reply #1 on: May 13, 2021, 08:58:37 am »
Bronze? Last time I had to machine bearing collars for some one way bearings I got a 12" length of 4x3 Bronze bush. There was a full range of sizes available with good overlaps. Mill a flat on it and then screw  a steel base maybe.

Schedule 80 Pipe (think that is still the USA standard) would be ok on the bigger one in 2 1/2" but neither 2 or the 2 1/2 will suit the smaller one. It is generally the thickest wall section available in the smaller sizes but you might find 120 or 160 if you get lucky.
Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 

Offline Smokey

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Re: Steel Round Tube For Bearing Housings???....
« Reply #2 on: May 13, 2021, 09:14:26 am »
I need to weld them to some other parts, so it has to be steel.  Brazing won't work for this one.

I know I can get whatever I want from mcmaster, but paying $97.52 for 1 foot of 2-1/2" Sch80 is not going to happen.... ($8.12/in)
https://www.mcmaster.com/pipe/thick-wall-steel-unthreaded-pipe/pipe-size~2-1-2/

I can still get 3" hot rolled A36 solid round bar cut to length for cheaper (before this steel shortage, WAY cheaper):
https://www.mkmetal.net/hrroundbar3x20
$615 for 20ft = about $2.56 an inch
 

Offline beanflying

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Re: Steel Round Tube For Bearing Housings???....
« Reply #3 on: May 13, 2021, 09:28:29 am »
Sounds like you have your question answered then ;) As I don't currently have accesses to a Lathe I have just been pushing the job to a local shop and leaving the decisions to them whenever a need comes up. Last job was a run of 24 small 2" Bushes for bearings and they wanted under $10USD for each and the larger job could easily afford it. I doubt I could have made them for less if I charged my time on making them even with a Lathe.

Your other option might be find a Cast bearing carrier close to size and machine it out and push/shrink a bronze bush into any gap. Still means a mechanical fastener into your frame/build then is all.
Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 

Offline Smokey

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Re: Steel Round Tube For Bearing Housings???....
« Reply #4 on: May 13, 2021, 09:37:49 am »
Hmm.  MandK does have 2-1/2 Sch80 listed and it's cheaper than solid. 
https://www.mkmetal.net/blackpipesch802-12x21

I wonder if they actually have any stock.  Gotta make some calls tomorrow it looks like.

These things are trailer axle bearings, so I was looking at turning down cheap wheel hub housings, but that still seems silly. 
 

Offline jpanhalt

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Re: Steel Round Tube For Bearing Housings???....
« Reply #5 on: May 13, 2021, 10:37:10 am »
There are a variety of "steel tube" available.  For example: various pipe sizes & wall thicknesses, welded, seamless, roll on mandrel.  Moreover, distributors basically price by the pound.  Prices at McMaster, HD, Lowes, and online are outrageous by comparison. (Although, I do use McMaster for a lot of other things.)

Look in your area for distributors/dealers.  There are also yards that specialize in "cut offs" from nearby industrial places  If you are in the Dodge Center, MN  or Cleveland, OH areas, I can suggest some good sources.  For example, last Fall, I paid $50 "out the door" for an 8' piece of 5" x3" x 1/4" angle in Cleveland.   I have had the best luck with small to medium size, family run dealers/distributors.  It may also help to say what you are using it for, as I did with the angle (i.e., snow plow for a farm).
 

Offline Robert Smith Eco Warrior

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Re: Steel Round Tube For Bearing Housings???....
« Reply #6 on: May 13, 2021, 02:18:55 pm »
Hi.
I just made a bearing housing from a piece of thick walled tube about 80mm O.D. x 40mm I.D. that was a bit difficult to get hold of and expensive. I think I would start from solid bar which might be a lot easier to get.
 

Offline coppercone2

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Re: Steel Round Tube For Bearing Housings???....
« Reply #7 on: May 16, 2021, 06:59:35 am »
I think the part if you want to buy it is called a roller bearing cup (not sleeve), they are ground and hardened and I guess designed to be either press fit or retaining compound fit into a blind hole

The benefits of the hardened surface may outweigh the integration of the cup into the spindle itself, and its much easier to manufacture since I guess you only need to bore a hole, I think they have optimum performance if all surfaces are hardened.
« Last Edit: May 16, 2021, 07:01:29 am by coppercone2 »
 

Offline Smokey

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Re: Steel Round Tube For Bearing Housings???....
« Reply #8 on: May 17, 2021, 01:17:52 am »
... The benefits of the hardened surface may outweigh the integration of the cup into the spindle itself, and its much easier to manufacture since I guess you only need to bore a hole, I think they have optimum performance if all surfaces are hardened.

Yup.  It's the mild steel housing that I'm pressing the hardened cup/ring into that I need to make.  Then this housing gets bolted to the machine and all the guts of the spindle get installed in it.  However cool it would be to build the cup into the housing, I don't have the capabilities to heat treat or grind something that big with the needed precision.
 

Offline Gregg

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Re: Steel Round Tube For Bearing Housings???....
« Reply #9 on: May 17, 2021, 02:21:51 am »
I have a pipe that is 3" OD and 2.43 ID that is a little rusty on the ID but will probably clean up enough for the larger bearing you listed.  It was the inner upright for an aircraft jack stand so it isn't rusted like if it was used for water.  How long do you want and how many?  PM me if it looks like something you want; I'll give it to you if you want to pick it up.
 

Offline Smokey

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Re: Steel Round Tube For Bearing Housings???....
« Reply #10 on: May 17, 2021, 10:08:59 am »
I appreciate the offer, but I like to at least try to find consistent sources for materials in case I need to make more of whatever I'm making.  I think I'm going to go pick up some of that sch80 pipe and see how it machines.  Hopefully it's not as terrible as some other smaller diameter black pipe I tried machining a few months back.
 

Offline coppercone2

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Re: Steel Round Tube For Bearing Housings???....
« Reply #11 on: May 18, 2021, 02:15:07 am »
if you want it easy I think the go-to is lead alloy steel that machines very well for weird things you are learning on

Not sure if its more or less expensive but I was  thinking that would be a good material to have in the shop for prototyping, it seems like the perfect type of steel for using on my mini-mill

I notice things that are welded or cast end up with surprises, I have a feeling drawn pipe has some kind of aspect to it that makes it suck

8 2'' feet for 128$, don't see 3'', but a piece might clue you in on what the best possible surface finish results are from your lathe and tell you if that process is good enough without the heartache https://stockcarsteel.com/cold-rolled-round-bar-12l14-2.html?options=cart

from what I understand it should give you truly excellent surface finish for a bearing cup that is turned. I have a feeling surface finish will be more important that overall hardness for a bearing cup, the damage that comes from roughness will probobly manifest itself quicker then the wear related deformation that comes over time, with reasonable loads, at least thats my hypothesis. When stuff starts bouncing or abrading I think it will snowball very quickly.
« Last Edit: May 18, 2021, 02:31:27 am by coppercone2 »
 

Offline Smokey

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Re: Steel Round Tube For Bearing Housings???....
« Reply #12 on: May 18, 2021, 07:44:55 am »
if you want it easy I think the go-to is lead alloy steel that machines very well for weird things you are learning on

no-go.  Need to weld it.  Stuff like 12L14 really doesn't like being welded.

I notice things that are welded or cast end up with surprises, I have a feeling drawn pipe has some kind of aspect to it that makes it suck

Yup.  Start out over dimension, weld first, then machine.  Expect things to move... a lot..

from what I understand it should give you truly excellent surface finish for a bearing cup that is turned. I have a feeling surface finish will be more important that overall hardness for a bearing cup, the damage that comes from roughness will probobly manifest itself quicker then the wear related deformation that comes over time, with reasonable loads, at least thats my hypothesis. When stuff starts bouncing or abrading I think it will snowball very quickly.
I think you would really need to grind something like a bearing cup for it to work well.  But for $9USD you get the press in cup and the bearing, so that's an easy decision.
 

Offline Smokey

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Re: Steel Round Tube For Bearing Housings???....
« Reply #13 on: May 18, 2021, 07:51:44 am »
Material Report:
I got some of that 2-1/2" Sch80 Black Pipe (2.875"OD, 0.276" wall) today.  So far so good!  As expected it's really not very round and there is a weld seam, but there was enough material to machine down and still hit the important dimensions.  The machinability is actually surprisingly good.  The metal is pretty uniform (no little stupid pockets of hardness) and it makes a good chip.  Lots of interrupted cuts while making the thing round and getting through the seam on the inside, but not bad at all once through that.  I think this is a winner for the 1.5"ID tapered roller bearings.
« Last Edit: May 27, 2021, 10:32:11 am by Smokey »
 
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Offline JohnMc

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Re: Steel Round Tube For Bearing Housings???....
« Reply #14 on: May 30, 2021, 01:51:53 am »
I have made a number of things from sch80 however you can get 3" DOM with a .375  wall. 
 

Offline Smokey

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Re: Steel Round Tube For Bearing Housings???....
« Reply #15 on: May 30, 2021, 09:28:51 am »
...you can get 3" DOM with a .375  wall.
True.  But...
https://www.mkmetal.net/domroundtube3x.375x25.5
$1138.50 for 25.5ft = $3.72/inch

2-1/2 Sch80 = $352.85 for 21ft = $1.40/inch
https://www.mkmetal.net/blackpipesch802-12x21

That's more expensive than the solid 3" A36 bar.  If I needed better steel (the DOM is 1020) I would certainly go that way.
 


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