Re: Brake Testing Appliance.
| April 04, 2017 09:47PM |
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Just couldnt wait to show of the guns huh!! 
I have been an auto mechanic, and a forklift mechanic in my life. I know my way around a sheared bolt! To brag, I successfully drilled through 4 4-40 screws and extracted them. The hardest ones though were the rear mount bolts on a forklift transmission. About a 3/4 inch hardened bolt that would vibrate and gum up the threads. First the problem of drilling the center of a hardened bolt, then the threads fight you the whole way out. The mount is part of the frame, and cannot be cut or modified. The first one I did took about 2 working days, as I did not have correct drill bits. Instead, I had HSS bits and a sharpener. Drill about 1/64 of an inch, sharpen, repeat until through, switch to a larger drill bit, repeat. Once proper size was achieved, heat with a torch until almost red hot, begin extraction, repeat until free. Re tap threads and install new bolt...
Casey
I have been an auto mechanic, and a forklift mechanic in my life. I know my way around a sheared bolt! To brag, I successfully drilled through 4 4-40 screws and extracted them. The hardest ones though were the rear mount bolts on a forklift transmission. About a 3/4 inch hardened bolt that would vibrate and gum up the threads. First the problem of drilling the center of a hardened bolt, then the threads fight you the whole way out. The mount is part of the frame, and cannot be cut or modified. The first one I did took about 2 working days, as I did not have correct drill bits. Instead, I had HSS bits and a sharpener. Drill about 1/64 of an inch, sharpen, repeat until through, switch to a larger drill bit, repeat. Once proper size was achieved, heat with a torch until almost red hot, begin extraction, repeat until free. Re tap threads and install new bolt...
Casey
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488 stops for water at Los Pinos tank on closing day Oct. 1979. Photo courtesy Don Richter
The NGDF was started by Don Richter and is currently operated in his memory by Nathan Holmes and others. Others who have contributed to the upkeep of this board are (in no particular order): Charles McCandless, Everett Lueck, Ted Wilton, Cole Adams, James Bane, John Moellmer, Jon Bentz, Linn Moedinger, lloyd lehrer, Rod Jensen, John Craft, Steven Forney, Herb Kelsey, Bill Ramaley, Russ Sperry (El Russo Loco), Josh McNeal, John West, Jim Armstrong, Bob Bergstrom, Greg Scholl, Blake Forbes Doug van Veelen and Mark Fuller.