Cast iron should drill quite easily with a standard bit, though you might get more life out of a drill made for metal. I don't think the blade configuration on a masonry bit is right for cast iron. David Love davidlovepianos at comcast.net www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Bob Hull Sent: Wednesday, August 23, 2006 9:33 PM To: pianotech at ptg.org Subject: drill bit for cast iron Drill Bit Question: Background: Yesterday I was trying to repair an Everett console that had a separation crack between the last lamination of the pinblock and the back beam. I guess it's glue joint failure and a downward warping of the wood from the downward pull of the tuning pins. I made plans to install 3 bolts 3/8" x 5"L after applying CA down in the crack. However, drilling through the plate took about 45 minutes to do 1 hole. I used a carbide tipped masonry bit per the suggestion of a industrial machine tool and supply co. I also tried using a 1/4" bit first and then progressing to a 3/8" bit. So, I wound up just installing 1 bolt due to time restraints. I have done this repair a few times before but it's been awhile and I don't remember it taking this long to drill thru the plate. I used a good low rpm electric drill vsr 0-600 rpms. Any drill bit recommendations? Thanks, Bob Hull __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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