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Re: Re: While on backhoes. . .
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Posted by Ken McWilliams on January 06, 2001 at 07:55:28 from (152.163.195.187):
In Reply to: Re: While on backhoes. . . posted by T_Bone on January 06, 2001 at 03:16:11:
T_Bone, I agree with your opinion about allowing the pins to wear before the bushings which provide replacing only pins at repair time. I can't agree, however, with your selection of materials. "Any pipe" does not have enough carbon to be sufficiently hardenable. Your procedure for hardening and tempering is reasonably correct, but "you can't get there from here" using standard steel pipe. I suggest that you determine the size of the bushings and purchase drill bushings from McMaster-Carr, Reid, Carr-Lane, or some other industrial supplier. These bushings in the neighborhood of 1-1/4" I.D. are about $10 each. With hardened (Rockwell Rc 60 hardness scale)bushings reinstalled, the hobby users won't wear out these bushings in a lifetime. The pins should not be made out of cold roll. It's too soft and will begin to wear after just a few projects. A better choice would be to use 4140 pre-hard (Rockwell Rc30). It's nearly as cheap as cold roll. Another approach would be to use "leader pins" from an injection mold making supply (DME) or from a die supply. Leader pins are the large diameter pins used in the corners of a mold or die base to align the halves as they come together in a press. These leader pins are reasonable in price and are available in fractional sizes over 1". An alternative is to use leader pin bushings from a mold or die supply house, also. Ken McWilliams
Dayton, OH
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