luvdunhill Posted September 27, 2010 Report Share Posted September 27, 2010 Hey, I'm having a slot milled that will accept a piece of aluminum bar that is nominally 0.5" wide. How wide should I have the slot milled in order to ensure that the bar can be easily removed? I'm not sure what the tolerances are on aluminum bar and not really sure what extra width to account for that doesn't require a hammer to (re)move the piece. Quote Link to comment Share on other sites More sharing options...
swt61 Posted September 27, 2010 Report Share Posted September 27, 2010 I would guess that 1/64" over would be plenty large enough. Not sure what that is in mm., but in SAE it'd be 33/64". If it doesn't matter if the slot is a bit oversized I'd go with 9/16" just to be safe. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 27, 2010 Author Report Share Posted September 27, 2010 yeah, I was thinking 1/64" as well, assuming exactly 1/2" bar. However, I have no idea what the tolerances on aluminum bar are. Quote Link to comment Share on other sites More sharing options...
nikongod Posted September 27, 2010 Report Share Posted September 27, 2010 mcmaster carr has dimensional tolerances for most of their bar stock. A quick check of the 1/2"X?? got +/-0.014" as a worst case on the 1/2" dimension which is just under 1/64" (0.015625"). Quote Link to comment Share on other sites More sharing options...
aerius Posted September 27, 2010 Report Share Posted September 27, 2010 Is it just the end of the bar that's going into the slot or are you sliding half the bar through the slot? If it's the former than it doesn't really matter since aluminum's pretty soft and it shouldn't be hard at all to file or grind down the end of the bar if needed. Quote Link to comment Share on other sites More sharing options...
justin Posted September 28, 2010 Report Share Posted September 28, 2010 CNC milling tolerances are typically +/- 0.005 unless you ask for better than that Quote Link to comment Share on other sites More sharing options...
Listen2this1 Posted October 6, 2010 Report Share Posted October 6, 2010 What you need to consider is this. If the bar is nominally .5" ( Quote Link to comment Share on other sites More sharing options...
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