The mandrel makes it easy with your bushings to make various pens .
The bushings match the parts of the pen . Unless you are making
slimline pens most of the bushings have various size on them . Craft
supply has good illustrations of their parts . That might help with
the  visual of why the mandrel is useful.

On Wed, Apr 16, 2014 at 2:51 AM,  <jwb...@windstream.net> wrote:
> Well Tim your not as Lazy as I am, I won't bother looking up the tube 
> diameter, I will just measure the ones I have.  I am not sure if I am being 
> lazy, or if I just don't trust other people when it comes to damaging a tool 
> (Router Bit, Pen Tube, or Mandrel)
>
> Jeff Becker
>
>
> ---- jwb...@windstream.net wrote:
>> Setting the depth of a pen for a barley twist can be simple, you mount  the 
>> tubes on the mandrel with no wood present in the machine, you lower the bit 
>> to the tube the raise it a safe amount and set a stop, you will then use 
>> that stop as the lowest point to turn the wood.
>>
>> With you having cad software you can draw the part on the computer and save 
>> some time, if you have a z axis up grade
>>
>>
>> Jeff Becker
>>
>>
>>
>> ---- Tim Krause <artmarb...@comcast.net> wrote:
>> > Why would I need a sacrificial pen mandrel?  Do you think the pen would be 
>> > too large of a diameter if you went the full depth of the barley twist 
>> > bit? I really have not worked out the details which I asked if it had been 
>> > done.
>> >
>> > -Tim
>> >
>> >   ----- Original Message -----
>> >   From: rookie
>> >   To: legacy-ornamental-mills@googlegroups.com
>> >   Cc: Legacy-Ornamental-Mills@googlegroups.com
>> >   Sent: Friday, April 11, 2014 7:44 PM
>> >   Subject: Re: Barley twist on pens
>> >
>> >
>> >   I made lots and lots of rope twist pens for my son's Boy Scout Troop as 
>> > a fundraiser, we sold them at a local Art & Craft fair. The higher priced 
>> > ones, $30, sold the quickest, these had fancier parts/exotic wood, the 
>> > regular ones sold for $20.  I like your idea Tim for a barley twist, I've 
>> > considered it, seems you would need a sacrificial pen mandrel. perhaps 
>> > brass rod.
>> >
>> >   On Thursday, April 10, 2014 1:50:56 AM UTC-5, Tim wrote:
>> >     Hey Bill,
>> >
>> >     A long time ago you said magnate did not make a small enough barley 
>> > bit to do pens.  I see a 7557 bit  that has a 3/4 diameter and a cutting 
>> > depth of 3/32.  That should work for a pen.  Has any one tried a single or 
>> > a double start barley twist on a pen?
>> >
>> >     -Tim
>> >
>> >
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