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Do you lap your female centres ?

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philf:
Pekka,

I made a test bar for my lathe using some hardened and tempered ground bar. I could drill the centres with a centre drill but there was still some runout. I held one end in a collet and supported the other end with a fixed steady (right at the end) and then bored the centre with the topslide set at 30 degrees to the lathe axis and it's now within about 0.001mm TIR.

Phil.

PekkaNF:
Thank you Phil.

I tried it once, but had trouble of making a small boring bar to bore out small enough centre. Now, when you reminded of this method and I'm thinking if I have broken solid carbon end mill I could grind the small boring bar.

Pekka

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