The Shop > Tools
Do you lap your female centres ?
awemawson:
I've only done it once as an experiment, and it wasn't very scientific. Certainly improved the centre hole cosmetically but I had no means of any quantitative measurements
PekkaNF:
I wonder how well small cylindrical rotating diamond file would work, when feed at half angle?
Like those:
http://www.netkonttori.fi/adeona/745949/web?1402058056
Pekka
leg17:
--- Quote from: awemawson on October 22, 2016, 12:16:51 PM ---Male centres I can do easily on my Jones & Shipman 1300 EUIR cylindrical grinder, but I've still not got any way of lapping female centre holes other than a suitably pointed wooden dowel and lapping paste.
--- End quote ---
Andrew
Buy a center lap and follow my detailed instruction.
Done in the tool and die and machining industry all the time.
You don't have to re-invent the wheel.
PekkaNF:
Depending on your intrest this might be OT or not. Least my question is closely related:
How to true female centre to OD of the clinder? Specimen is surface hardened very accurate tool steel rod, relatively soft centre (carbide cuts easy, HSS just about).
I bought well used and some parts missing small bench centre. Checking against blued surface plate shows slight dip on the middle of the table and rails. Very slight.
Just about fits my DIY clindrical "test bar" l=300 mm OD25mm.
Shows less than 0,02 mm of TIR, I would like improve it a little without grinding OD.
The indicator is off on that picture, I moved the bench centre to be able to take clear photo.
Pete49:
Yes as often as I can. :beer:
oops oh metalwork....bugger
Pete
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