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3rd January 2014, 09:48 PM #1.
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Blacking As An Alternative to Bluing
Ray suggested the use of soot from a candle flame as a means of "colouring" an arbor to test its fit so I gave it a whirl this morning. I had been using bearing blue but with poor results either from a poor fit or poor application of the blue. Licking the flame across the metal results in a deposition of soot, the more licks the blacker. I tried three 30 taper arbors, my home made version, one from CTC and a Schaublin.
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Mine first. There is contact about two thirds of the way up the taper. I have some ISO 30 collets and their contact surface is about the same, so I won't fiddle with mine any further
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The Chinese. It appears that the taper is hollow with contact at the ends only.
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And the Swiss. Pretty much uniform contact.
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I found this a lot easier than mucking around with blue. Thank you Ray.
Bob.
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3rd January 2014 09:48 PM # ADSGoogle Adsense Advertisement
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3rd January 2014, 10:24 PM #2Philomath in training
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- Oct 2011
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- Adelaide
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Bob, are you going to do the arbor I sent you with this method? I'm interested to know whether I've gained enough skills to be a Chinese machinist yet.
Michael
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3rd January 2014, 11:55 PM #3Senior Member
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Hi Bob, something worth trying is lighting some camphor, easy to get from some moth/silver fish repellant from the local super market. Nice really black deposit.
tinkera
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4th January 2014, 08:56 AM #4SENIOR MEMBER
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- Jun 2012
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- SA
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Kero wick in a lantern would work well I suspect.
RobThe worst that can happen is you will fail.
But at least you tried.
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4th January 2014, 12:18 PM #5Originally Posted by BT
I always associate lamp-blacking with leather aprons and flakey tobacco in tins, cloth caps, and running a lathe wearing a tie. Absolute precision craftsmanship and everything ruled by British Standards.
Ray
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4th January 2014, 01:02 PM #6GOLD MEMBER
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- Jul 2010
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- Melbourne
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According to the docco I saw Purdey is still much like that* and still use lamp black for final fitting of their actions.
Stuart
*with the odd CNC here and there
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4th January 2014, 07:18 PM #7
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6th January 2014, 08:32 AM #8GOLD MEMBER
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- Jul 2006
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- Adelaide
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- 2,680
burning masking tape gives off a lot of soot
or you could you use a calcium carbide burner also
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