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| machining a bearing housing to size |
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| picclock:
Don't know if anyone has any good tips on this. I'm machining some 22mm recesses for a bearing and they always seem to come out too small or too big. I've just done one which seemed just right, I pushed the bearing in, without excessive force (so i thought) and its too small having compressed the bearing to the point that it won't turn. A thou or so larger and I'm using epoxy to hold them in. Is it just me or are there other tricks/tips that I should be using to get that perfect fit ? Any advice much appreciated Best Regards picclock (shame about HMEM) |
| David Jupp:
Loctite (or similar) bearing retainer - saves the day if you can't get the sizing quite right. |
| BillTodd:
One way I used is to make a gauge; turn a piece of scrap with steps at 1/2 (0.0005") and 1 thou" under size (much easier to measure a O/D than a bore) Bore carefully to the 1 thou" under-size, then cut dust (i.e. repeated passes without moving cross-slide) 'till the 1/2 thou" under-size just fits (this'll give you a press fit ) |
| jiihoo:
Hi, Any possibility that the housing was hot after machining when you measured it and it then shrunk some as it cooled? Dunno how hot it needs to be for the expansion / shrinkage to be significant, but if you are getting into the hair splitting domain in the accuracy department then you need to take this into account too. Jari |
| loply:
How are you boring them, on a lathe? What setup/tools/etc? Couple of tips I have learned: 1) When you get real close to final size, measure your tool post movement using a dial indicator, not using the markings on your dials 2) Beware of a burr on the bore when you do your measurements and trial fits, remove it with a file or deburring tool or suchlike as it will make the bearing appear to be a tight fit until the bur breaks off, then you realise it's oversize 3) As hinted above if the part is real hot it can grow but in my tests at this kind of size you'd only get 0.01-0.02mm growth with a LOT of heat 4) How are you measuring the bore? Telescoping bore gauges are probably your best bet, inside calipers won't work. |
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