I'm sure we've all had tense moments- times when you're about to do something and nervous about the outcome- like plugging in the machine you've just rewired and hoping it doesn't put on a free smoke show.
Had one of mine today- not anything unusual, but I was working on my saw blade arbor and the time came to shrink fit a flange. Shaft is 5/8 and I bored the flange to .620 by my dial gauge. This should mean the bore is .622 for a 3 thou interference fit- a bit tight possibly? Anyway, I heated the flange til it turned purple, then checked with a scrap of the same shaft I used for the arbor. The shaft went in a bit but seemed too tight so I yanked it out right away. Thought I'd better cool it off and check the bored hole to see if it was the same diameter on both sides of the part. Far as I could tell it was, so this time I heated the flange to almost glowing, then quickly placed it over the arbor. It slipped on easily and I rotated it in place to help it align. I don't think I had two full seconds before it gripped and couldn't be moved. Bit of a pucker factor there-
Had one of mine today- not anything unusual, but I was working on my saw blade arbor and the time came to shrink fit a flange. Shaft is 5/8 and I bored the flange to .620 by my dial gauge. This should mean the bore is .622 for a 3 thou interference fit- a bit tight possibly? Anyway, I heated the flange til it turned purple, then checked with a scrap of the same shaft I used for the arbor. The shaft went in a bit but seemed too tight so I yanked it out right away. Thought I'd better cool it off and check the bored hole to see if it was the same diameter on both sides of the part. Far as I could tell it was, so this time I heated the flange to almost glowing, then quickly placed it over the arbor. It slipped on easily and I rotated it in place to help it align. I don't think I had two full seconds before it gripped and couldn't be moved. Bit of a pucker factor there-
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