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22mm dia hole and getting a correct distance on a mill?
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<blockquote data-quote="TheTallGuy" data-source="post: 6854802" data-attributes="member: 9121"><p>You'll struggle to get to tolerance without reaming or professional grade successive drills. For many applications it's not necessarily that crucial for the fit to be that precise & a dab of high strength retainer does the job for stopping the race from moving. The most important part is usually the angular alignment & axial mismatch as this puts unwanted forces onto the bearing which can lead to premature failure. </p><p></p><p>For getting consistent spacing it will depend on your mill & its capabilities. I'd aim to create a jig for repeatable clamping & use a DRO to validate the positions. I would avoid using laser cut holes to pilot from as if they aren't perfect & correctly aligned they will cause the drill to deviate from true, as could burrs etc. The correct approach is to use a spot/centre drill to create a cone for the pilot drill to pick up on, then use a series of drills to get up to undersized before putting the reamer through. A trick that I have used before - especially when there is an existing pilot hole of questionable position is to use an end mill as this avoids the problem of drill point going off course, but depth of cut & cutter wear can become an issue.</p></blockquote><p></p>
[QUOTE="TheTallGuy, post: 6854802, member: 9121"] You'll struggle to get to tolerance without reaming or professional grade successive drills. For many applications it's not necessarily that crucial for the fit to be that precise & a dab of high strength retainer does the job for stopping the race from moving. The most important part is usually the angular alignment & axial mismatch as this puts unwanted forces onto the bearing which can lead to premature failure. For getting consistent spacing it will depend on your mill & its capabilities. I'd aim to create a jig for repeatable clamping & use a DRO to validate the positions. I would avoid using laser cut holes to pilot from as if they aren't perfect & correctly aligned they will cause the drill to deviate from true, as could burrs etc. The correct approach is to use a spot/centre drill to create a cone for the pilot drill to pick up on, then use a series of drills to get up to undersized before putting the reamer through. A trick that I have used before - especially when there is an existing pilot hole of questionable position is to use an end mill as this avoids the problem of drill point going off course, but depth of cut & cutter wear can become an issue. [/QUOTE]
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22mm dia hole and getting a correct distance on a mill?
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