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Old 02-16-2019, 03:02 AM   #1 (permalink)
 
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Default Getting a lot of failures

Hello all , basically my wood keeps breaking off my brass tubes , I have a few ides why but would like to know what the most common causes are ?


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Old 02-16-2019, 03:18 AM   #2 (permalink)
 
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I think the most probable cause would be wrong glue and/or bad technique.
Can you explain your process so that we can help you get to the bottom of the problem.
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Old 02-16-2019, 03:23 AM   #3 (permalink)
 
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Hi Dave,
It could be any of many reasons;

1. Too aggressive a cut
2. Dull tool
3. Tool operator error. Angle, distance between rest and work
4. Bad glue or not enough or not set
5. Tube not de-greased or scuffed to provide glue key
6. Loose grained wood

I'm sure there could be many more though
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Old 02-16-2019, 03:52 AM   #4 (permalink)
 
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Quote:
Originally Posted by skiprat View Post
Hi Dave,

It could be any of many reasons;



1. Too aggressive a cut

2. Dull tool

3. Tool operator error. Angle, distance between rest and work

4. Bad glue or not enough or not set

5. Tube not de-greased or scuffed to provide glue key

6. Loose grained wood



I'm sure there could be many more though


I am leaning towards bad glue ,


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Old 02-16-2019, 04:20 AM   #5 (permalink)
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Skiprat's list is good. Review all. Don't try to find any single cause - because it can be a combination of two or three.

Is your tool edge sharp enough to shave hair off of your arm?
Are you cleaning & scruffing the tubes with Sandpaper?
Are you using medium or thick CA, or epoxy? are you coating the inside of the blank well?

One other suggestion: once the blank is rounded, soak it in CA and let it set for a few minutes. This is a little like stabilizing and works well on course/porous/knarly wood.

I don't like using sandpaper personally in most instances, but do suggest at times to use 320 (or medium fine) to sand it down to close to size and then finish sanding with 400 or better.
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Old 02-16-2019, 05:26 AM   #6 (permalink)
 
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I have seen more people have problems with CA glue than all other glues added together. I know there are people that use it without problems, but for peace of mind, I think epoxy is a far better option.

Scuff the tubes well, make sure there is enough clearance between blank and tube, coat both the inside of the blank and the tube with epoxy, insert tube with a twisting motion . Give it sufficient time to cure. Goodbye problems.
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Old 02-16-2019, 05:51 AM   #7 (permalink)
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Skiprat's list is a good place to start and something I did on the list caused the blowout. Inevitably, whenever I've had a blank blowout, I find that there is no glue on either the blank or tube in that area.
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Old 02-16-2019, 07:11 AM   #8 (permalink)
 
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I also agree with Skiprat's list & what other's have said. Most times when I see a failure, it's because of lack of glue coverage. It's funny to me that we will spend from $10 to $50 on a kit, plus $4 on up for a blank, but won't spend an extra 10 on a liberal amount of glue. I don't know if this might be your problem, but I've seen it many times, including my own failures.

Or it could be a problem not already mentioned. Sometimes we just mistake firewood for turning wood.
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Old 02-16-2019, 07:52 AM   #9 (permalink)
 
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Try using Gorilla glue- - -it has served me well for 5 years with ZERO failures
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Old 02-16-2019, 08:04 AM   #10 (permalink)
 
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I always use thick CA glue. I squeeze a little into each end of the blank and then liberally apply all around the tube. Then just push the tube in. I don't worry about wasting any, it'll turn off anyway. (Knock on wood) I've never had a tear out or anything.
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