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| lathe headstock bearing fit |
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| Jonfb64:
Hi all, I am currently rebuilding the headstock on my lathe, all the info I have says the taper roller bearings should be a tight press fit. How do I know / measure this? The lathe is an Acorn, Sphere Atlas clone. |
| John Rudd:
I'd say the outer races need to be a press fit into the bearing housing and the inner races should be a hand tight fit on the lathe spindle.... If the inner races were too tight on the spindle, how would the preload be set? I changed the bearings on my mini lathe and mini mill adopting this approach and have had no issue... |
| lordedmond:
well I would say if it is taper roller both ends my approach would be if possible due to the machining tolerances that are there now . light press in of the outer races and a light press fit of the inner cone on the chuck end but a light slide fit on the outboard inner race as John says with out that you will not be able to adjust the end float , it will stick slide and you will get nowhere this may sound brutal but when you have set the end float give the spindle a firm rap with apiece of wood or a dead blow hammer on both ends along the axis of the lathe this will ensure that the races are seated , don't worry about the races think of what a wheel bearing on your car has to put up with but do run the lathe at a slow seep for a short time and check the bearing temps if they are ok go to top speed for 15 mins and keep checking the temps slacken off if it gets to hot, note hot is 20 deg C above ambient a usefull too is one of the cheap none contact lazer ten gauges with one of those you can keep your eye on it without your hands near the rotating spindle Stuart |
| DavidA:
Stuart, You refer to 'end float' . Is you are talking about taper roller bearings wouldn't you have pre-load and no end float at all ? Dave. |
| Jonfb64:
Thanks all for the replies. John I have read how you did your minilathe bearings and have a question. How did you ensure even removal of material all over the seating area and prevent the shaft going out of line axially i.e. moving the center line to one side? |
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