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Pen bushing leaving discoloration on blanks?

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Forum topic by Split posted 157 days ago 424 views 0 times favorited 6 replies Add to Favorites Watch
View Split's profile

Split

33 posts in 363 days


157 days ago

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

166 posts in 156 days


#1 posted 156 days ago

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

285 posts in 735 days


#2 posted 156 days ago

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 (online now)

Kenbu

17 posts in 505 days


#3 posted 156 days ago

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

982 posts in 759 days


#4 posted 155 days ago

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 2218 days


#5 posted 155 days ago

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

1001 posts in 741 days


#6 posted 153 days ago

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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