f1 extensions

[MikeWooldridge]

Mmmm you'd need to be very specific about which datum plane to set . The whole datum frame would need to be well defined in order to measure it accurately. . Most people don't even measure the diameter of the butt, they tend to measure the width.
Any lobing error wouldn't be measured . .

does anyone know what he's talking about?

i've heard of datum, but no idea what lobing is. sounds like a sexual fetish to me...

[MikeWooldridge]

In my line of work, (Structural Steelwork), we work to the nearest 2 mm

are you sure about that? i've had steels turn up 2 foot short before and been told they were right

i'll come to you next time...

[MikeWooldridge]

Phah 0.02mm ? Luxury ,.

One of our designers regaled us with a drawing of a short 40mm shaft ( 8mm dia ) with a tol of +/- 0.0075mm !!

Obviously didn't have any clue of how the cost would change from +/- 0.01mm he initially spec'd.



I feel a pythonesque response coming about living at the bottom of the lake etc

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i could only think of eating gravel but i couldn't find a place for it in the context for this conversation...

[jrc750]

are you sure about that? i've had steels turn up 2 foot short before and been told they were right

i'll come to you next time...

Nothing that a bit of packing wouldn't sort lol

[billabong]

does anyone know what he's talking about?

i've heard of datum, but no idea what lobing is. sounds like a sexual fetish to me...

If you measure a 50p piece with a digital caliper, you'll get a smaller size than the diameter of hole it would fit through.

It's a lobed shape, and because it has an odd number of high points, you don't pick it up with a caliper
( a caliper will always pick up the lobe high point and an opposing flat ).

The red dia will be greater than the width ( green bit )



Probably won't matter with your tolerances though.

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[old school]

I ll bite . Think of a perfectly round hole e.g. F1 joint , introduce a round dent/protrusion ( can be more than one) in the circumference of the circle ( outward) . Tolerance of F1 = WRECKED , Integrity of F1 = Knackered , thus F1 joint crap.This is " lobing " and your engineer/machinist would probably describe it more eloquently than this N.B. before the engineers on the forum correct me this is the best description I could come up with after coming back from the pub .Another " lobed " shape is the rotor from a Wankel ( no comments, please ) rotary engine , sort of an isosceles triangle with equal curved not straight sides.Mike stop laughing..........

[perpetualboredom]

Can we just get this straight, I didn't lob the extension anywhere, it just fell!

[old school]

PMSL , quality , Mike , quality.

[Guy3103]

These are really unreal quality... there is definitely no better extension in the world!! I just wish you could use them with any cue as i dont get along well with both of my MW cues