Bushings vs. Calipers

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JonathanF1968

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Oct 7, 2018
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Curious about using calipers rather than bushings. Is this a thing?



I want to make a one-off pen, of a style that I'm likely not going to do for anyone else, and I'd have to get a new bushing set for it. But I'm feeling a little tired of buying bushings.... Is there a reason not to just use calipers to get the final dimension?


Or, measure the kit with the calipers and then find a bushing from another set that matches it? I feel like somewhere, I must have a bushing the right size....



--Jonathan
 
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Wagner11

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This is a pretty common practice the only issue being that if you use a mandrel you will need bushings to keep the tube centered.

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Lenny

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No reason not to just turn it between centers and use calipers to get it right. Another method some have used is to make some temporary bushings from corian or a dense hardwood. Bushing should only be used to get close to size anyways. Finish turning and sanding between centers without bushings will keep the blanks from getting contaminated from metal dust from the bushings.
 

Dehn0045

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I pretty much switched to calipers only, saves me the hassle and expense of buying and storing bushings. Plus I think I get a better fit. Definitely can take a little more time.
 

Dehn0045

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Also, just get a dead center and TBC, then you don't even have to worry about having a bushing with the right tube dia.
 

mbroberg

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TBC = Turn Between Centers. It is best to think of bushings as suggestions. Bushings wear and it doesn't take long for them to be a smaller diameter than they should be. A good set of calipers will get you to the right diameter every time. But, it can take a lot longer
 

JonathanF1968

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Oh, I see. So, the dead center is the on the drive end, and then my stock live center on the tail, or do I need a cone center on the tail as well?



In other words, what is the lathe setup for this?
 

Dehn0045

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Thanks Michael for picking up where I left off. I also do my CA finish between centers, a little paste wax makes cleaning the excess off the centers easier. I will also mount a scrap piece of wood and use a skew to clean up the centers. To me TBC is more intuitive than using a mandrel and bushings. There are a lot of small tweaks, but the but the basic idea is simple.
 

leehljp

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. . . But I'm feeling a little tired of buying bushings.... Is there a reason not to just use calipers to get the final dimension?

--Jonathan

Some wise old timers used to say this: Bushing are consumables! i.e. not permanent tools.

Many a new pen turners can't gt their head around that, but a few do!

The real question is: IS there any reason TO trust the bushings for final dimension /sizing? The answer is: No. Bushings change sizes everytime a piece of sandpaper or skew or scraper touches it while it is turning. Bushings are consumables!

Trust Calipers? Yes (if the calipers are good).
 

jxdubbs

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Derry NH USA
. . . But I'm feeling a little tired of buying bushings.... Is there a reason not to just use calipers to get the final dimension?



--Jonathan



Some wise old timers used to say this: Bushing are consumables! i.e. not permanent tools.



Many a new pen turners can't gt their head around that, but a few do!



The real question is: IS there any reason TO trust the bushings for final dimension /sizing? The answer is: No. Bushings change sizes everytime a piece of sandpaper or skew or scraper touches it while it is turning. Bushings are consumables!



Trust Calipers? Yes (if the calipers are good).
I like that saying.

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brailsmt

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Dec 6, 2018
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Kansas City, MO, USA
I went a middle ground and bought some TBC bushings that have a diameter small enough to make any pen. The bushings are basically just the width of the brass tube. No sandpaper or tool touches them. This alleviates a lot of the problems I had with both mandrels and mounting the blanks directly on the centers. I highly recommend them, I had mine made by Brian at tbcbushings.com.
 
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