Wildguzzi.com
General Category => General Discussion => Topic started by: fotoguzzi on November 18, 2022, 06:16:49 PM
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Generic question, no Guzzi will be harmed in this experiment.I’m building something. I have two sizes of bearings I want to use.
First bearing is 0.86” or 21.7mm OD.. I want to drill some metal to seat them in..what size should the hole be for them to fit tight like a bearing should?
Second bearing, 1.06” or 26.924mm. Same . ? What size is the hole such a bearing would fit in?
Could I just buy a 26mm (1.02”) bit ? Or will that never work?
And back to bearing 1.. a 21mm (0.83”) bit?
Am I nuts to think I can do this with a drill press and not a lathe? What’s the normal tolerance for bearings?
If fit is loose, I assume brazing would be a complete no no, right?
(https://i.ibb.co/0nw5fFL/2353-C8-A9-89-B9-467-E-B4-EC-FB27-E8-C4-DA72.jpg) (https://ibb.co/0nw5fFL)
Not what I’m building.
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All your answers are here:
https://www.skf.com/us/products/rolling-bearings/principles-of-rolling-bearing-selection/bearing-selection-process/bearing-interfaces/tolerances-and-resultant-fits
You are looking for a press fit of a few tenths of a thousandth of an inch.
The attached article and related charts will give you the numbers you need for a properly engineered fit.
A drill press and drill will not hold those tolerances.
A precision reamer stands a possibility of holding the tolerances.
A boring head in a miller, jig bore or lathe can hold those tolerances.
If it's not a high load application you could make the holes a few thousandths loose and bond the bearings in position with Loctite RC680.
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All your answers are here:
https://www.skf.com/us/products/rolling-bearings/principles-of-rolling-bearing-selection/bearing-selection-process/bearing-interfaces/tolerances-and-resultant-fits
You are looking for a press fit of a few tenths of a thousandth of an inch.
The attached article and related charts will give you the numbers you need for a properly engineered fit.
A drill press and drill will not hold those tolerances.
A precision reamer stands a possibility of holding the tolerances.
A boring head in a miller, jig bore or lathe can hold those tolerances.
If it's not a high load application you could make the holes a few thousandths loose and bond the bearings in position with Loctite RC680.
Well said! Listen to this guy! ^^^^^
I've used Loctite 680 more than once. Great stuff. Almost exclusively on bronze bearings when I did not have access to great machining facility.
Using a hand file to reduce the OD of a bronze bearing and some Loctite 680 can save the day in some situation.
I don't recommend using a have file on "real bearings" such as wheel bearings.
Kids don't try this at home!
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This will be sort of a toy with no real stress or weight so perfection not required.
The lock tight will be just the thing, I think.
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(https://i.ibb.co/H2QHYDJ/RC680.jpg) (https://ibb.co/H2QHYDJ)
upload pictures free (https://imgbb.com/)
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This will be sort of a toy with no real stress or weight so perfection not required.
The lock tight will be just the thing, I think.
If the hole ends up bigger than you thought or want, you can always peen the id of the hole or the edge of the hole to retain the bearing. Or you could drill a hole between the OD of the bearing and the ID of the hole to pin the bearing in place.
Lots of ways to install the bearing if high loads and speeds aren't present and precision is not required.
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I might rethink the whole bearing scenario if this is a toy project. Maybe figure what hole size you can make and then source some bearings to fit that hole. Many common bearing sizes can be dirt cheap and bought in various quantities. Amazon shows many bearing under five dollars a piece and quantity discounts. Locktite is a good option and I have had good luck with JB Weld for some low stress items.
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I get the bearings for really really cheap from the Axman surplus. It’s a very cool store with all kinds of funky stuff.
Thanks all! I can make it work with lock-tight and some peening.