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Subject Topic: Straightening Questionable Slide Tubes Post ReplyPost New Topic
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Technician & Clinician
Technician & Clinician

Joined: March.15.05
Location: USA
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Posted: March.23.05 at 8:58am | IP Logged Quote NealAnderson

Have you ever had a trombone in your shop that had tubes that you were afraid would buckle due to red rot if you tried to straighten them? ...or tubes that were too severely bent for just drawing the dent out?
Try this:
Take a slide mandrel and put it at the EXACT location of the bend. Chuck it in a vise and use it to "rebound" the slide back straight. This is VERY immediate and VERY direct. You only need medium-strength blows at the hardest and check frequently.
One blow may be enough!
After straightening using this method, there is sometimes (though not that often) a bit of distortion where the end of the mandrel contacted the opposite side of the slide. Tap this area down and use a slide expander to lightly burnish this area back round.
Voila! With some practice, you'll add this technique to your arsenal and repair slide tubes you previously thought couldn't be repaired!

Happy straightening!
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Joined: January.19.05
Location: USA
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Posted: March.25.05 at 4:30pm | IP Logged Quote MattStevens

When trying to straighten slide tubes that you don't want to do the regular way (pushing down with a rag or something while rubbing the length of the tube), try this: After using the Ferree's N87A (one of the best and easiest to use tools I have ever seen) over the last few years, I've found that it has a tendency to slightly bend the tubes (which I can usually straighten in one shot by the traditional method). The nice thing is that it's always predictable - if I'm using the pliers on the top side it bends slightly down....if I'm on the right side, it bends left, etc. I now use this method to STRAIGHTEN tubes with the support of a tight mandrel running the length of the tube, with no possible chance of a collapse.
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Joined: September.25.05
Location: Canada
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Posted: October.02.05 at 9:23pm | IP Logged Quote michaeldurocher

Message one worries me about possibly bending a hand slide mandrel.

When I was first taught I was shown how to burnish on the mandrels but found that non of the mandrels we straight and caused more problems for me later.

I ended up buying a new set of mandrels that give me a true product everytime faster.

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