Thread: bearing cross reference

Can someone with a cross reference book look up a New Departure OL19 followed by what looks like hand written DTL7? What seems a bit strange is the shaft size is closest to a 17.5mm, actual measure is 3.690" and 17.5 mm is 3.691" This is from a Monarch EE1000 lathe, and is the bearing farthest away from the chuck on the spindle. One would not think a lathe built in 1957 would have metric parts, but perhaps because this is a ball bearing, and somewhere I read that all ball bearings are metric? At any rate, would appreciate any info.

Dale Nelson

3.691" is in fact 93.7514 mm, not 17.5

Oops, looked at a chart for some other size and 17.5 mm stuck in my head. Metrics ain't my strong suite anyway! But that diameter does not look right in either metric or inch fractional measure?

Dale

3 Vintage New Departure OL19 Ball Bearings Untested | eBay

New Departure Hand Book 23rd Edition Ball Bearing Catalog by N/A: New Departure Soft Cover - Easy Chair Books


I'm no bearing expert, but Timken's interchange guide dies not seem to have any number starting with Oscar Lincoln. I'd measure everything a couple more times, determine the type of bearing..looks like extra-light single-row Conrad type, unless it is full-complement, then look in anyone's bearing catalogue.

But surely someone here knows off the top of his head what bearings the spindle of your lathe takes?

Generally a bearing with hand engraved markings denotes a special fitment, ie non standard size, perloading, or pair matching.
The bearings shown in the ebay link appear to be angular contact.

Seems to be in a catalog still. See RPM Bearings, but I bet a dollar they don't actually have any, and a quarter they can't get any.

D might mean duplex.....7 might mean ABEC 7.... It is off a 1000EE so it is probably going to be a super precision bearing...

My two cents from my New Departure 1955 handbook
OL19 Single row angular contact ball bearing, extra light series, 95 mm bore, 145 mm OD, 24 mm width
Equivalents would be Barden 119, Fafnir 9119, SKF 7019

DTL7 Duplex bearings in Tandem configuration, Light preload, ABEC class 7

Originally Posted by browniesharp

My two cents from my New Departure 1955 handbook
OL19 Single row angular contact ball bearing, extra light series, 95 mm bore, 145 mm OD, 24 mm width
Equivalents would be Barden 119, Fafnir 9119, SKF 7019

DTL7 Duplex bearings in Tandem configuration, Light preload, ABEC class 7

Thank you browniesharp. I was looking at the possibility of using used bearings of unknown previous use or quality, and now at least I have some probability of finding at least one of these as a viable number. ABEC class still an unknown, but a big step forward! Thanks again. And a thank you to Don for starting and running a forum that constantly amazes one with the depth and breadth of knowledge and resources

Dale

One? Duplex means matched pair doesn't it?

This is a duplex bearing arrangement. Only one of the bearings is making noise, but if the price of 2 doesn't buckle my knees when I hear the price, will replace both.

Dale

Are you sitting down?Premium Precision Duplex Angular Contact Radial Ball Bearings - Radial Ball Bearings | MSCDirect.com

You better lie down with this one. SKF 7019 CD/HCP4ADGA Angular Contact Bearing,Duplex Set,Light Preload,ABEC 7 - 9 Extra Precision,Ceramic Balls,15° Contact Angle,Universal Arrangement,Metric,95mm Bore,145mm OD,24mm Width: Amazon.com: Industrial & Scientific

But at least it ships for free.

From what I have,
A 0L19 should be 3.7402 bore (95mm) x 5.7807 OD (145 mm) OD x .9449 (24 mm) wide. This, as said above crosses to a 7019.
Should be an "extra light series" with a 15 degree contact angle.
The DTL7 means duplex, tandem, light preload ,precision grade 7.
Very interesting to me for a lathe with this reputation, not what one would call a extremely stiff bearing pair.

If this is a very old set do not try to replace only one, They will have been ground in a matched pair. (newer stuff is ground universal and you can get away with mixing but they will still normally only be sold in pairs.)
What you need it to do will call out the grade you want to use.
Home shops can use 5's, 7's are a nice compromise, high production $100/hr machines should get 9's.

You pay for what you get, be careful buying bearings on e-bay or such as at this class.
If you set the bearing down hard on a table you ruin it. Drop it on the floor and you should toss it in the trash can.
Be thankful that you are not looking at high end triple zero Timkens. I could only wish that the bearings I buy where as cheap as the prices above.

When you take it apart be sure to spend some time cleaning the old bearing and figuring out why it failed.
You don't want the new one to do the same thing.
Bob

Just for an answer to the question of how a bearing can make so much noise when in the machine,and have no discernible noises when cleaned and oiled, and turned by hand? I put the bearing assembly back in, and found that the noise of the bearing decreased by maybe 90%? Anyway, a lot less than when first started. With it running, using a wooden dowel to listen, one could hear clicks and other noises from this(these) rear bearings. So they do need replacing, but at least now it runs without horrific noises!

I found a pair of new grade 7's on ebay for a palatable price, now just have to convince myself they are worth the gamble of maybe they are still perfect and maybe they ain't!

Thanks again for the info and opinions

Dale

Not wishing to hijack this thread but
my question is why?
I needed a bearing for my bridgport copy (comet) and it called for the same bearing as a bridgport .
I bought a "run of the mill" cheap bearing and my son had a fit! So we used his companys high end electronic measuring equipment and compared the cheap bearing to a grade 7 of the same size his company had as a spare for there mills. The difference ,if any, was in microns. the grade 7 may have been made of better material but the feel and size were the same. the only difference we could find was in the priceing ,it was different by a couple of 00.00
Did I just get lucky or is there really a reason to spend $$$$ instead of $$

I come up with the following solutions,

I show the following, Bardon - 119H / FAG - 7019 / MRC - 7019KR / NDH(New Departure) - OL19 / SKF - 7019C / Split Ballbearing (Div. of MPB) - HADR119.

Bore is 95mm, OD os 145mm, width is 24mm, Duplex width is 48mm. These are extra light series angular contact bearings and the New Departure notes show they are only available in ABEC 7 precision.

I PDF'ed the page and it can be DL'ed by this link (for a time anyway).

https://dl-web.dropbox.com/u/5195423...rture_OL19.pdf

Note suffix shows that the contact angle is not the same for all the bearings listed & it does not state if the New Departure bearings are 25 degree or just what they are (important for thrust). You're prolly better off contacting a local bearing house as my CR bearing cyclopedia's are near 20 years old...

Good Luck
Matt