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Pen bushing leaving discoloration on blanks?

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Forum topic by Split posted 03-16-2014 04:05 PM 509 views 0 times favorited 6 replies Add to Favorites Watch
View Split's profile

Split

33 posts in 491 days


03-16-2014 04:05 PM

I turned a pen blank the other day and used the bushings for the first time all went well until I started finishing. The wood was a really light colored maple. I went to apply a drop of boiled linseed oil as I usually do but upon working it into the blank with a towel moving side to side I noticed a problem. The bushings were somehow dis coloring my wood with a grey color. I am guessing it was fine metal from the last sanding. I was wondering if anyone has had this problem? Should I clean new bushings with break cleaner or always make sure to wire everything down with tack cloth?

Thanks


6 replies so far

View TechTeacher04's profile

TechTeacher04

198 posts in 283 days


#1 posted 03-17-2014 03:14 PM

I agree with your thought. The color change is from a reaction between the metal filings and the wood/finish.

View JADobson's profile

JADobson

409 posts in 863 days


#2 posted 03-17-2014 03:28 PM

I’ve had this problem before too. If anyone has a solution that more than one person would appreciate it.

-- James

View Kenbu's profile

Kenbu

21 posts in 632 days


#3 posted 03-17-2014 03:45 PM

After experiencing this myself a few times, I invested in a set of plastic cone-shaped bushings that I now use for all my finishing.

Ken

View Wildwood's profile

Wildwood

1245 posts in 886 days


#4 posted 03-17-2014 06:52 PM

Stop sanding your bushings! Cleaning bushing with brake cleaner not going to help anything if continue sanding them.

If pick up a dead center, can sand and finish without bushings. You need dead center in headstock & live center in tailstock. Can only do one barrel at a time.

Hit the pen barrels & bushings with compressed air before finishing.

Wipe off pen barrels & bushings with paper towel before finishing.

Some turners wipe off with solvent, acetone, alcohol (DNA), mineral spirits before applying finish.

-- Bill

View Darell's profile

Darell

421 posts in 2346 days


#5 posted 03-17-2014 07:10 PM

I wrap the bushings with quarter inch masking tape before finishing. No problems. I have been considering those plastic bushings that Kenbu uses though. They’re a good idea.

-- Darell, Norman, Ok.

View TerryDowning's profile

TerryDowning

1025 posts in 869 days


#6 posted 03-19-2014 11:28 PM

You can even turn your own finishing bushings. If I can do it anyone can.

Just find some cast acetal rod (Delrin) because nothing sticks to it. Urethane Rod works well too.
Drill a hole the same size as your mandrel. I used 1/4” drill bit.
Mount to your mandrel and shape the cones. The angle is not critical, it just needs to be even and accommodate multiple tube diameters.

When your ready to sand and finish your turned blank, swap your metal sizing bushings for the finishing bushings.

I have even skipped the metal bushings and used the plastic finishing bushings from the start. Just sneak up on the diameter measuring with calipers as I get close. Use the mating hardware as your reference measurement for each tube end.

-- - Terry

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