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Remember, tolerance in this discussion is how close fitting the parts will be. Nothing to do with how long those bearings might last.

Probably best not to 'save money' by rushing to nastyRubbish.com and buying the cheapest possible bearing you can find on the market though! Very cheap goods are rarely top-quality…

Yet the experience of mini lathe owners seems to be that good brand standard taper rollers work best. Rollers will take more load with less distortion than balls under working conditions.

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Sphericalroller bearings

Haha. That was a topic of such massive debate in the model engineering world of the 1950s that Mr Timken or one of his top men wrote a letter to the ME magazine explaining why these newfangled tapered roller headstock bearings would not precipitate the violent and shaking end of the world. I believe it is reproduced in the Articles section of this very forum website.

In the lathe 19th and early 20th centuries many companies tried to find ways to mass-produce high-tolerance rolling parts and failed! During WW2 both the UK and Nazi Germany imported top-end bearings from Sweden because SKF was one of the very few makers in the world capable of producing really good rolling bearings. (Better than anything UK, Germany, Japan, France, Italy or the USA could do, even though all these countries were all in the race, ho ho, geddit.)

American Roller Bearing Company primarily makes heavy duty industrial class bearings that are used in various industries in the US and around the world.

As always, horses for courses, but today 'good enough' roller bearings are usually the best bet for most purposes, even lathes! Low maintenance, high-reliability, and standardisation means they're relatively cheap and easy to replace. Probably best not to 'save money' by rushing to nastyRubbish.com and buying the cheapest possible bearing you can find on the market though! Very cheap goods are rarely top-quality…

Taperedrollerbearing assembly

American Roller Bearing Company primarily makes heavy duty industrial class bearings that are used in various industries in the US and around the world.

I’ve spent hours over the last three days looking for tapered roller bearings with tighter than normal tolerances and didn’t find any. Timken and SKF sites list tapered roller bearings with standard and tighter tolerances but I couldn’t find any. So I spoke with their technical support people and was told that, while they list them with tighter tolerances they don’t make them but if someone ordered 1000 they might make them. I’ve also searched many bearing distributor sites, in the US, UK and Japan and even sent emails to a few and got replies that they only have standard class K or class 0 tolerances. Does anyone know where to get tapered roller bearings with tighter tolerances?

Bearing inspections, hands on training, installation assistance, inspection, maintenance, reinstallation, field repair and/or factory reconditioning.

Certainly true in the good old days because it's much harder to make roller bearings than plain bearings. Balls and rollers were especially challenging because roller bearings run rough and wear quickly if only one of them is slightly out.

Taper roller bearingsfor sale

But this was in the long gone world of Trade Secrets, active patents, and semi-understood engineering. 80 years later it's not rocket-science to mass-produce good bearings anywhere in the world. Whilst the best bearings are still premium products, it's because of the extra care, exotic materials, and quality control typical of aerospace and other hi-tech requirements, not because there's any magic in it!

American Roller Bearing Company primarily makes heavy duty industrial class bearings that are used in various industries in the US and around the world.

Since I have to replace the bearings I think angular contact bearings with tighter tolerances make sense. They don't cost much more than top quality tapered roller bearings.

Although plain bearings are the easiest and cheapest way of making a precision smooth running lathe spindle there are disadvantages:

Taper rollerbearing size chart pdf

Home › Forums › General Questions › tapered roller bearings This topic has 29 replies, 18 voices, and was last updated 18 March 2021 at 19:13 by duncan webster 1. Viewing 25 posts - 1 through 25 (of 30 total) 1 2 → Author Posts 9 March 2021 at 23:48 #28034 Henry RancourtParticipant @henryrancourt22682 Advert 9 March 2021 at 23:48 #532874 Henry RancourtParticipant @henryrancourt22682 I’ve spent hours over the last three days looking for tapered roller bearings with tighter than normal tolerances and didn’t find any. Timken and SKF sites list tapered roller bearings with standard and tighter tolerances but I couldn’t find any. So I spoke with their technical support people and was told that, while they list them with tighter tolerances they don’t make them but if someone ordered 1000 they might make them. I’ve also searched many bearing distributor sites, in the US, UK and Japan and even sent emails to a few and got replies that they only have standard class K or class 0 tolerances. Does anyone know where to get tapered roller bearings with tighter tolerances? Thanks, henryr 9 March 2021 at 23:51 #532875 bernard towersParticipant @bernardtowers37738 For what purpose? 10 March 2021 at 00:24 #532878 Henry RancourtParticipant @henryrancourt22682 My Prazi SD300 uses tapered roller bearing for the spindle. 10 March 2021 at 04:34 #532885 Niels AbildgaardParticipant @nielsabildgaard33719 It is my guess that headstock bores for cups and spindle seats for cones are more than ten times more unround than chineese taper rolling bearings. To use Your own time hunting unicorns is OK,but the bearing merchants are there for living. The whole point of tapered roller bearings is to adjust their preload on site. 10 March 2021 at 05:46 #532887 HopperParticipant @hopper But tolerance and clearance are two different things. You can adjust clearance as you say but tolerance is the machined finish of the races and rollers and the exact size there of. Sounds like you have to buy the close tolerance bearings from the machine tool supplier who get them made in batches to special order. Hence the hundreds upon hundreds of pounds for Colchester taper roller headstock bearings. You might try some of the quality Japanese suppliers like Koyo and Naachi. Or the German FAG? But, depending what you are doing with your little Prazi lathe, the standard grade bearings will probably do the job. Maybe talk to Ketan at ArcEurotrade. He is pretty up on these small lathes and various bearing upgrades and suppliers.   Edited By Hopper on 10/03/2021 05:48:33 Edited By Hopper on 10/03/2021 05:49:33 10 March 2021 at 06:13 #532889 Ketan SwaliParticipant @ketanswali79440 Posted by Hopper on 10/03/2021 05:46:57:

Since 1911, we've been engineering, designing and building solutions that meet and exceed customer’s requirements for standard and specialty bearings.

I made a spindle and thought I could just buy tapered roller bearings. The spindle run out was 0.015 or so mm tir. It turns out that the bearings I bought were just the commercial grade for trailer wheel bearings. It was the concentricity of the inner and taper of the inner ring, as well as the roundness of the taper on the outer ring. At first I thought it was my housing not being true. I bought another bearing from a different batch and that was a lot better, but was 8um of TIR. So instead of messing around and reworking the bearing rings, I just replaced them with spindle grade angular contact bearings. Now it is less than 2um TIR so super happy with it. But the spindle grade are very expensive compared to the regular grade of angular contact bearings. Had I made it to the dimensions that are used in some milling spindles, then I could have got the right roundness and concentricity in a tapered roller bearing. The rollers that I checked were very good for roundness.

American Roller Bearing Company is a leading manufacturer of quality Anti-Friction Bearings in the industrial markets we serve.  Our anti-friction bearings permit free motion between moving and fixed parts. As a roller bearings manufacturer for over 100 years, we know that anti-friction bearings are essential to mechanized equipment as they hold or guide moving machine parts and minimize friction and wear. Our quality commitment starts with our top management and is supported conscientiously by all the people in our company. We strive to produce correctly, the first time, products and services which consistently meet or exceed our customer's requirements and specifications. Our company will efficiently apply our resources and will involve and train all of our people for the purpose of continually improving the quality of our products, processes, and services. We will consistently monitor our processes and success by the satisfaction of our customers.

A few years back I needed to acquire a number of abec 7 bearings for some spindles that were in the early design stage. Before going too far with the design, which was flexible on size at this stage. I contacted my usual local bearing supplier only to be told that no bearings were available in the particular size I quoted. After ringing round and getting the same answer I contacted SKF themselves, I think they were somewhere like Luton at the time, they were able to tell me that if I placed an order shortly for the forty odd bearings I wanted they would be available as they were going into manufacture in a few weeks. It seems like most things semi specials are produced in batches when a suitable quantity is preordered or likely to be.

Cylindricalroller bearings

I emailed many distributors, in the US, UK and Japan and Timken, SKF and Nachi technical support, and all told me they only make tapered roller bearings in the lowest tolerance class like 0 or K. It seems there is one company, Gamet, that makes them but cost is around $1000 for one bearing. So i'm considering using angular contact or deep groove ball bearings. My research has started.

But tolerance and clearance are two different things. You can adjust clearance as you say but tolerance is the machined finish of the races and rollers and the exact size there of.

Sealed taperedRoller bearings

I saw a video on Utube yesterday on some of those, 11 thou wobble and made from mild steel, they were crushed in a vice into a pretzel

Only used taper roller bearings on larger spindle designs for milling or slow revolving shafts. Bearing manufacturers used to produce documents showing bearing configurations for different machine tool spindles, they probably still do. Dependant on spindle size and weight capacity you could probably get away with a set of angular contact bearings and roller bearing.

Timken taperedRoller Bearings

I doubt that a Hobbymat's turning performance would be substantially improved by fitting precision grade bearings over standard grade for a reputable maker.

It is my guess that headstock bores for cups and spindle seats for cones are more than ten times more unround than chineese taper rolling bearings.

On one occasion a precision ball thrust bearing just couldn't be obtained, so BSL (as it was at the time) sent us their entire stock of standard grade bearings & I had to unpack each one, clean it, set it up on a surface plate and measure the axial runout. One ended up being only just outside the specification for the precision grade – we used that & returned the rest. Some of the others were only just within spec for the "normal" grade !

Taper roller bearingssizes

No. I think it was a genuine response to an ongoing debate trying to convey the latest technology to the grumpy old gits of pre-internet days. I doubt that Mr Timken cared too much about the model engineer's lathe market when they were selling wheel bearings to every car manufacturer in the world. It was a different world back then. And I think he was right: roller bearing lathes went on to become the norm and generally speaking seem to perform better than the old plain bearing machines. Compare a roller bearing Boxford or other South Bend Clone with an ML7 and you will soon be a believer. Plain bearings are so 1936.

For over 100 years, we have been engineering, designing and building solutions that meet and exceed customer’s requirements for standard and specialty bearings.

I would expect that the "tolerance" described by the OP is more likely the accuracy of the bearing under operating conditions compared to a "standard" bearing – reduced axial and radial runout that would translate directly to improved part accuracy on a lathe.

Sounds like you have to buy the close tolerance bearings from the machine tool supplier who get them made in batches to special order. Hence the hundreds upon hundreds of pounds for Colchester taper roller headstock bearings.

Machine tool accuracy bearings were troublsome and expensive to source several years ago. My previous employment was for a CNC machine tool rebuild company & spindle bearings were replaced during a rebuild. Mostly we had specialist bearing factors searching for them & most were NOS. Timken quoted 2 years delivery on one direct enquiry, which led to the original bearings having to be refurbished rather than replaced (crossed roller bearing for a vertical borer). The races were reground and a new set of rollers manufactured. SOD's assertion that " roller bearings run rough and wear quickly if only one of them is slightly out " was not true in this case – a surface finish issue with the finished machine was eventually traced to the remanufactured rollers not being made to the required dimensional accuracy. The table ran smoothly and quietly, and the total axial displacement was within spec. , but the axial error was not in the same place every rotation of the table. Another set of rollers made to a tighter tolerance fixed the problem – suprising the effect of a "roving" 0.04mm error on a machine with a 1500 mm diameter table !

Ball-bearings were popularised by push-bikes because plain bearings exhaust the rider, but early attempts to make them were only moderately successful in that they soon wore and became bumpy. The best early bearings weren't good enough for a lathe – they didn't last long enough before vibration set in.

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Remember, tolerance in this discussion is how close fitting the parts will be. Nothing to do with how long those bearings might last.

Haha. That was a topic of such massive debate in the model engineering world of the 1950s that Mr Timken or one of his top men wrote a letter to the ME magazine explaining why these newfangled tapered roller headstock bearings would not precipitate the violent and shaking end of the world. I believe it is reproduced in the Articles section of this very forum website.