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Question on barrel trimmer

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Forum topic by bbasiaga posted 07-26-2018 01:42 AM 795 views 0 times favorited 10 replies Add to Favorites Watch
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bbasiaga

1243 posts in 2415 days


07-26-2018 01:42 AM

I just got the Whiteside barrel trimmer kit, plus a mandrel for a 12.5mm tube.

I have perhaps a dumb question, but the mandrel is mean to go in the tube and square up the end to the tube right? I tried it tonight and it worked fine on a brass tube, but then bound to a grey tube (which is brass underneath whatever turns it grey), broke the glue and the whole thing came out of the blank. I had to cut the tube off the mandrel.

The rest of the grey tubes were also quite tight but I did not try them under power. They came from the PSI pen flashlight kits. So is it tight tubes? Or was I not supposed to have the tube in there when I was doing the reaming?

-Brian

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


10 replies so far

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TheDane

5654 posts in 4083 days


#1 posted 07-26-2018 02:31 AM

So is it tight tubes? Or was I not supposed to have the tube in there when I was doing the reaming?

The tube has to be installed in the blank, so I would say the PSI tubes are the problem. The barrel trimmer is designed to do two things: 1) square up the ends of the blank, and 2) clear any debris (e.g. glue, chips, etc.) from the inside of the brass tube.

FWIW, you cannot buy better tools than those made by Whiteside.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View woodbutcherbynight's profile

woodbutcherbynight

5966 posts in 2829 days


#2 posted 07-26-2018 04:14 AM

Yes tube must be installed first. I have noticed many use a corded drill to do this. It works but a 12vt cordless on low works much better and less risk of fatal grabs.

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

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Wildwood

2673 posts in 2555 days


#3 posted 07-26-2018 10:28 AM

Would contact vender of tubes and explain your problem! Several companies make parts & tooling for kits in China so quality can be an issue.

Would not hurt measure inside & outside of kit components and tooling when get them. Also if getting glue failures change the glue you use. I went from CA & polyurethane to two part epoxy bought locally. Never had glue failures with either poly or epoxy.

I plug pen tubes with play doug to keep glue from getting inside tubes. Speaking from experience sometimes pen mill & barrel trimmer doesn’t remove glue inside tubes. Understand problem is pen mill too tight for tubes but they may tell you it is glue inside the tube so just a heads-up tell them you always plug tubes!

-- Bill

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Andybb

1932 posts in 1023 days


#4 posted 07-26-2018 05:29 PM

The mandrel fits inside of a 7mm brass pen tube. Not sure what the grey tubes you mention are. I rarely use my barrel trimmer anymore. Started using the disk sander method as the trimmer too often would destroy delicate blanks or blanks that were made up of glued or segmented pieces.

I use plumbers putty like Wildwood uses play dough. I put the putty in one end of the tube, coat the tube with glue and stick it in half way while rotating the tube. Then take it out, put more glue on the tube and then push it in from the other end while twisting. I have found that CA is very brittle and is not a good adhesive for tubes and blanks. Either Gorilla Glue (using a Q-tip to wet the inside of the blank) or epoxy. I’ve just accepted the fact that I can’t turn a blank 15 mins after glueing the tube in. I’ll now glue a batch of blanks one evening and turn that batch the next day. I don’t think I’ve had a blowout since I made the switch.

When I do get glue inside the tube I will sometimes use the transfer punches that I use to disassemble pens.

-- Andy - Seattle USA

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TheDane

5654 posts in 4083 days


#5 posted 07-26-2018 06:05 PM

The mandrel fits inside of a 7mm brass pen tube.

Not for the kit the OP was using … the tubes are 12.5 mm and require appropriate size bushings to mount on the mandrel.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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Andybb

1932 posts in 1023 days


#6 posted 07-26-2018 06:16 PM



The mandrel fits inside of a 7mm brass pen tube.

Not for the kit the OP was using … the tubes are 12.5 mm and require appropriate size bushings to mount on the mandrel.

- TheDane


Right you are. I missed that part.

-- Andy - Seattle USA

View bbasiaga's profile

bbasiaga

1243 posts in 2415 days


#7 posted 07-26-2018 06:42 PM

Thanks for the replies guys. And yes I was sure to have the right sized mandrel for the larger tube.

The grey I refer to is the tube color. These are not brass, but coated in something to make them grey. When i cut it to get it off the mandrel I could see it is brass underneath the grey. I measured the inside diameter of the tube and it was only a few thousandths smaller than a 12.5mm brass tube I had from a different kit. Maybe the small difference and possible reduced lubricity of the grey coating was just enough to bind?

I have not had an issue with CA glue yet. I think it only broke because the drill bound and it was the next weakest point. But I will consider going to gorilla glue. Can’t hurt to try on some future project. I do find that I often prep a lank one day and turn it another anyway.

Brian

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

View Wildwood's profile

Wildwood

2673 posts in 2555 days


#8 posted 07-26-2018 08:15 PM

Have one of those Universal pen mill & barrel trimmer sets not sure of OD sizes but would install a smaller pen mill into the barrel trimmer and use that. Think 3 or 4 pen mills different sizes know don’t have 12.5 mm. Use a small drill press & vise to hold blanks.

I would worry more about components of kit fitting those gray tubes and use your brass ones on hand. If blanks are acrylic just paint those tubes!

Would still contact vendor!

-- Bill

View bbasiaga's profile

bbasiaga

1243 posts in 2415 days


#9 posted 07-26-2018 10:46 PM

Thanks wildwood. These are the tubes that came with the kit, so I hope they work out with the rest of the parts. I will try and get some pics tonight.

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

View Wildwood's profile

Wildwood

2673 posts in 2555 days


#10 posted 07-27-2018 12:54 PM

We are talking about Whiteside pen mill pilot shaft too tight to fit the tubes supplied and ripping out tubes after glue up. Never had pen mill shaft too tight going into a tube. That shaft should slide in with little resistance if any. So is the problem failure due to tubes, pen mill piot shaft, or simply CA glue failure?

Do know about CA glue failures with easy fitting pen mill pilot shaft’s. CA glue not as gap filling as claimed! CA glue doesn’t have much shear strength even after 24 hour drying or cure time. CA glue only has a shelf life of year or two, never seen an expiration date on a bottle. See short article:

Just changing to either poly or epoxy glue may solve the problem.glue little bit better but epoxy even better! Waiting until next day to mill & turn like OP said might solve the problem.

https://www.permabond.com/2014/07/17/storage-shelf-life-cyanoacrylate-adhesives/

Coating of gray stuff inside tube may or may not be the problem don’t know. We want components pressed in tight! That’s why use pen press, c-clamp, or table vice to press in components. If pen mill pilot shaft is removing gray coating inside tube & enlarging inside diameter and components fit loosely that’s not good. On the other hand even with some gray coating removed components do press in tightly no problem.

Many people use hand drills (battery or electric) to mill blanks and that’s okay if drilling square! If drill canted a little possible to pull tubes out of the blank. Have used both lathe & drill press to mill blanks, but prefer my drill press.

I would try a different glue allow to dry or cure, and if using a hand drill make sure drilling squarely. Kit tolerances measured in thousands, with very little wiggle room so measuring tooling and components before starting kind of a clue to success or possible failures!

-- Bill

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