Boring conversation

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5 years 1 week ago #19283 by JRI
Replied by JRI on topic Boring conversation
The answer was to mount a 6mm dia milling cutter in an ER25 collet chuck on the tailstock. With the wheel clamped by the brake face using the outside jaws of a 3-jaw chuck on the lathe. Very slow feed and the hole was trued up quite nicely.
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5 years 1 week ago #19284 by John Bannister
Replied by John Bannister on topic Boring conversation
Surely if you use 6mm end mill you end up with a 6mm hole unless you offset the tailstock or it wasn't centered in the first place

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5 years 1 week ago #19286 by DavidTappin
Replied by DavidTappin on topic Boring conversation
joneb pointed out that

Surely if you use 6mm end mill you end up with a 6mm hole unless you offset the tailstock or it wasn't centered in the first place


He is quite right of course, to put it in perspective the tailstock would only need to be 2 thou’ out of line with the headstock for a 6mm milling cutter to produce a 6.1 mm hole with that set-up. Sorry about the mixed units but somehow 2 thou’ seems a lot less than 0.05 mm!

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5 years 1 week ago #19287 by JRI
Replied by JRI on topic Boring conversation
Quite right (both of you) what I suspect is that the original hole created using a 1/4" (6.35mm) drill wandered but the 6mm end mill took out the low point of the eccentricity maybe resulting in the far end of the hole being a couple of thou' larger than planned and not perfectly circular but sorted!

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5 years 1 week ago #19288 by JRI
Replied by JRI on topic Boring conversation
And yes, jacking up the tail-stock with a shim was an option for reaming the holes size!
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5 years 1 week ago #19290 by Dave Rogers
Replied by Dave Rogers on topic Boring conversation
If you need a small reamer John in future, Dave bright is the man to see! Or not in literally one view! :)

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