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Old 05-10-2018, 08:27 PM   #1 (permalink)
 
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Default Mother of Pearl Blanks

Yesterday I turned my first mother-of-pearl blank. It was a challenge because the material was very fragile and tended to chip easily. I worked slow, took small passes and was able to finish turning and sanding the blank. Then disaster struck when I went to assemble the pen. A small crack appeared on the inside of the blank (not on the exterior). The farther I pushed the transmission in, the longer the crack grew. I had used a chamfering tool prior to assembly on both ends of the blank. Anyone have any suggestions on what else I may try to prevent this in the future? Appreciate your advice.

Seven
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Old 05-10-2018, 08:57 PM   #2 (permalink)
 
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Ream out the brass tube so that it slides onto the hardware fairly easily and glue.

I use straight-sided adjustable reamers for this ... available from Grizzly and/or HF.
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Old 05-11-2018, 07:39 AM   #3 (permalink)
 
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Where did you get the blank? Do you have pictures?
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Old 05-11-2018, 07:41 AM   #4 (permalink)
 
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The blank was a mother-of-pearl from PSI. It was a 7mm size. I will try and get a picture of it.

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Old 05-11-2018, 07:57 AM   #5 (permalink)
 
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Oh I see. I have seen those blanks. Those are the mass produced ones. They do tend to be a bit more brittle due to the process they follow. It was the same with the old circuit board blanks they sold. Mass produced PR blanks like that just tend to not turn as well.
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Old 05-11-2018, 08:42 AM   #6 (permalink)
 
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Mal I have this trouble from time to time as well. I looked up reamers at Grizzly and saw they have a set of adjustable ones. Is that what your using or do you have a one size does it all? Thanks
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Old 05-11-2018, 11:05 AM   #7 (permalink)
 
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I also looked up the reamers. The smallest I could find is a 1/4". Will that fit inside a 7mm tube?

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Old 05-11-2018, 12:44 PM   #8 (permalink)
 
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Quote:
Originally Posted by studioseven View Post
I also looked up the reamers. The smallest I could find is a 1/4". Will that fit inside a 7mm tube?

Seven
A quick search would tell you the answer is yes. 7mm = 0.2756" and 1/4" = 0.250".
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Old 05-11-2018, 12:51 PM   #9 (permalink)
 
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7mm is the outside diameter. What is the inside diameter?
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Old 05-11-2018, 01:56 PM   #10 (permalink)
 
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Whoops. Walls are generally about 0.014 thick so that would make the inside of the tube close to 0.245". So it might not fit. I did find a number of 6.0 to 6.5mm adjustable reamers on Ebay for about $10.00Can/$8.00US that should do the trick if the 1/4" was too big to start. Or you could get the 6.5mm-7mm if you didn't want the imperial set. Or a metric set though aliexpress.

https://www.ebay.ca/sch/i.html?_from...amers&_sacat=0

https://www.ebay.ca/sch/i.html?_odkw...amers&_sacat=0

https://www.aliexpress.com/item/The-...ceBeautifyAB=0

https://www.aliexpress.com/item/9pcs...ceBeautifyAB=0
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