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Posted by Mark Rand on March 13, 2006, 2:21 pm
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wrote:
>I've been practicing boring a MT #1 with the compound on my Sherline lathe.
>The results, after 4 tries are pretty dismal to say the least.
>The compound was set against a standard MT by feeling the taper and setting
>it for constant drag on a piece of paper, through the length of taper. The
>material is 12 L 14. Each attempt resulted in a taper alright, and one that
>would lock, but there would be a lot of runout depending on how carefully I
>positioned a test taper in the new socket. It appears the taper (socket) is
>a loose fit on the small end. I expect the taper male to fit solidly in the
>socket and be automatically aligned straight with just a tap from a plastic
>hammer. Not the case. Any suggestionss - please. Is there a better way
>than "feeling up" an accurate standard taper, like I'm doing. So far I
>haven't tried the chalk or layout blue method of determining fit. The throw
>is so short that there is only a very small window of adjustment on a MT #1.
>
>Bob Swinney
>
Ignoring the comments and advice the others have given, there is one other
thing.. If the tool is above or below the centre line at all, the taper will
be large at the small end. The taper will also not be a conical shape. So
that's another thing to check.
Regards
Mark Rand
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>The results, after 4 tries are pretty dismal to say the least.
>The compound was set against a standard MT by feeling the taper and setting
>it for constant drag on a piece of paper, through the length of taper. The
>material is 12 L 14. Each attempt resulted in a taper alright, and one that
>would lock, but there would be a lot of runout depending on how carefully I
>positioned a test taper in the new socket. It appears the taper (socket) is
>a loose fit on the small end. I expect the taper male to fit solidly in the
>socket and be automatically aligned straight with just a tap from a plastic
>hammer. Not the case. Any suggestionss - please. Is there a better way
>than "feeling up" an accurate standard taper, like I'm doing. So far I
>haven't tried the chalk or layout blue method of determining fit. The throw
>is so short that there is only a very small window of adjustment on a MT #1.
>
>Bob Swinney
>