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Pen Turning Mandrel Question

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Forum topic by JMillerWoodworks posted 02-08-2018 02:33 AM 335 views 0 times favorited 5 replies Add to Favorites Watch
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JMillerWoodworks

48 posts in 369 days


02-08-2018 02:33 AM

Topic tags/keywords: question lathe turning

I am new to turning pens and currently have been using a 7mm mandrel. I would like to get into turning the bolt-action pens; which are 3.8” barrel. However, I have yet to see a 3.8” mandrel. I have found many other sizes, but not this size. Is there a metric millimeter mandrel that is equivalent to a 3/8 inch or do I need a labeled 3/8” mandrel? If I do need a 3/8” mandrel, can you recommend a company that sells this size.

-- - Joel Miller "Striving to be like the Carpenter of Galilee"


5 replies so far

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woodbutcherbynight

4827 posts in 2432 days


#1 posted 02-08-2018 02:39 AM

Normally the site that sells the kits also sells the mandrels and other accessories. What site and what kit are you looking at?

-- Live to tell the stories, they sound better that way.

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Ripper70

1021 posts in 932 days


#2 posted 02-08-2018 02:43 AM

If I’m not mistaken, the mandrel stays the same. It’s the bushings that change to adapt to the pen blanks that you turn. There is a pen turning forum that would be worth joining if you’re just getting started in this endeavor. I’m sure you’ll find answers to all your questions there.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

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JMillerWoodworks

48 posts in 369 days


#3 posted 02-08-2018 02:52 AM

Thanks for the info! Now that I look it up online (I had been looking at a PSI catalog) I see that the 30 caliber bolt action pen is a 7mm. The one question that I have is if it uses a 7mm mandrel; then how come you used a 3/8” drill bit? 7mm is equivalent to 1/4”. Is the barrel actually 1/8” thick to made up for the difference of the drill bit? Thanks for commenting!

-- - Joel Miller "Striving to be like the Carpenter of Galilee"

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Ripper70

1021 posts in 932 days


#4 posted 02-08-2018 03:24 AM

See here for an assortment of bushings and here for the Bolt Action Pen Kit bushings.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

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bbasiaga

1234 posts in 2018 days


#5 posted 02-08-2018 03:45 AM

Yes, there will be a set of bushings listed with your pen kit. Those bushings will slide over the 7mm mandrel, and have a small section that fits inside the tube of the pen kit, and a larger section that marches the diameter you turn the blank to in order.to match up with the pen’s hardware.

This way, you use one mandrel for all different kits, and the matching set of bushings for each. Lots of examples on YouTube.

Brian

-- Part of engineering is to know when to put your calculator down and pick up your tools.

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