bhigdog
Stainless
- Joined
- Jul 20, 2005
- Location
- Eastern PA
Looking at reaming a 7/8 hole through an 8" length of 660 bronze 1 3/4 OD cored rod. Any hints tips warnings? Special brass/bronze reamer required?..........Bob
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Reaming 660 Bronze
- Thread starter bhigdog
- Start date
- Replies 5
- Views 1,015
bhigdog
Stainless
- Joined
- Jul 20, 2005
- Location
- Eastern PA
I edited my post to add the rod OD is 1 3/4"..............Bob
Dan from Oakland
Titanium
- Joined
- Sep 15, 2005
- Location
- Oakland, CA
660 is pretty easy to machine- nothing like the aluminum or manganese bronzes. Make sure the reamer is sharp, and you should be ok. Assuming here you are not planning on reaming the as cast cored hole directly with the reamer.
bhigdog
Stainless
- Joined
- Jul 20, 2005
- Location
- Eastern PA
I was planning to drill .015 under size. Chuck rod in 4 jaw and bore lead hole about 1" deep to center the drill. Then drill to middle and reverse. Then ream straight through. Hoping drill step in center, if any, will be minimum problem. Thoughts?.....Bob
If i was going for as straight as possible on a manual lathe, I'd drill with a 3/4 drill to center from both ends and bore from both ends as deep as I could to get the drilled hole straight. Then use a dubbed drill and/or ream all the way through to .015 to .031 under. Then final ream to size from one end.
To avoid chatter when boring the holes keep your SFM really low and set your boring bar around .02-.03 above center so when the bar deflects down it takes a lighter cut rather than a heavier cut.
The bar being above center will mess with your diameter readings on the dial/DRO but that doesn't really matter since your aren't boring to size.
To avoid chatter when boring the holes keep your SFM really low and set your boring bar around .02-.03 above center so when the bar deflects down it takes a lighter cut rather than a heavier cut.
The bar being above center will mess with your diameter readings on the dial/DRO but that doesn't really matter since your aren't boring to size.
