Single row angular contact ball bearing

Axial preloading springs may not workin in this application, due to the extreme precision demands. For a spring to be effective in applying preload, the bearing it is preloading must be free to slide on the shaft (or in the housing, if the spring is acting on the outer race). This means at least a microscopic amount of radial play, which may reduce the accuracy of the system.

I agree with israelkk's 1st suggestion of a duplex preloaded pair. If SKF doesn't seem to understand the virtue of this arrangement, they are not paying attention. The ideal system would have the duplex preloaded pair at one end of the shaft, and a cylindrical roller bearing with slight radial preload at the other end (this part is not easy to accomplish).

Another approach would be to use 2 single row bearings as you have already purchased, and design the mounting structure for the bearing at one end of the shaft radially ridgid, but with some axial flexibility (springiness). Then mount the bearing with the structure slightly deflected, so when it tries to go back to its free position, it applies a load to the bearings.

SKF has the ability to give you all the help you need with project - keep after them.

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So what are my options, ISO 492 Class 4 tapered roller bearings are hard to find listed let alone get a hold of, though equivalent Od and Id angular contact bearings are available from multiple manufacturers. The lost thickness can be made up by ground shims or modifying the head stock spindle retaining system. I would obviously need to take apart the head stock to see how best this be done, the shoulders of the bearings don't exactly match. The load limitations of these bearings is near equivalent. I'm just in the speculation phase of this.

Is it worth changing the spindle bearings to my lathe? Does the accuracy of the machine other sliding component take full advantage of the ABEC- 7 bearings.? This is the machine that I learned how to scrape dove tail ways, so the compound and cross slide are glass smooth with out wiggle. Scraping the bed ways would be on my short list, if successful I would then have a tool room lathe minus the ridged castings.

(The listed bearing dimensions are not confirmed to fit any lathe.)


Dimensions - D (outside diameter) 90mm
Dimensions - B (width) 21.75mm
$68.92 EACH


Dimensions - d (inside diameter) 60mm
Dimensions - D (outside diameter) 110mm
Dimensions - B (width) 23.75mm



CDGA/P4A
Dimensions - d (inside diameter) 60mm
Dimensions - D (outside diameter) 110mm
Dimensions - B (width) 22mm
$495.95 EACH


CDGA/P4A
Dimensions - d (inside diameter) 50mm
Dimensions - D (outside diameter) 90mm
Dimensions - B (width) 20mm
$362.97 EACH


https://www.timken.com/wp-content/u...ion-Tapered-Roller-Bearings-Brochure_.pdf

As the title suggests I intend to change the spindle bearings in my lathe. Mainly because I'm spoiled by the mas turn and colchester lathe at work, surface finish and parallelism are at a different league from my home lathe. So I spent some time and did some research on the size of bearings needed. The grizzly equivalent uses the bearings listed below and I would for quoting purposes for myself assume that theses are the same, I will of course take the machine apart to confirm bearing sizes. Finding high precision bearings in tapered roller bearings is a challenge, online distributes frequently display on their web site class 0 or class K, bearings in the appropriate size having 10-20 microns of runout. Usable for say a counter shaft used for power transition, though hardly satisfactory for a lathe. It is also about the amount of free play I have in my spindle bearings, so it is suggesting that the manufacturer very well could have used these bearings.So what are my options, ISO 492 Class 4 tapered roller bearings are hard to find listed let alone get a hold of, though equivalent Od and Id angular contact bearings are available from multiple manufacturers. The lost thickness can be made up by ground shims or modifying the head stock spindle retaining system. I would obviously need to take apart the head stock to see how best this be done, the shoulders of the bearings don't exactly match. The load limitations of these bearings is near equivalent. I'm just in the speculation phase of this.Is it worth changing the spindle bearings to my lathe? Does the accuracy of the machine other sliding component take full advantage of the ABEC- 7 bearings.? This is the machine that I learned how to scrape dove tail ways, so the compound and cross slide are glass smooth with out wiggle. Scraping the bed ways would be on my short list, if successful I would then have a tool room lathe minus the ridged castings.(The listed bearing dimensions are not confirmed to fit any lathe.)Dimensions - d (inside diameter) 50mmDimensions - D (outside diameter) 90mmDimensions - B (width) 21.75mm$68.92 EACHDimensions - d (inside diameter) 60mmDimensions - D (outside diameter) 110mmDimensions - B (width) 23.75mm CDGA/P4ADimensions - d (inside diameter) 60mmDimensions - D (outside diameter) 110mmDimensions - B (width) 22mm$495.95 EACH CDGA/P4ADimensions - d (inside diameter) 50mmDimensions - D (outside diameter) 90mmDimensions - B (width) 20mm$362.97 EACH

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