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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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