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  1. #31
    Join Date
    Nov 2020
    Location
    Cambridge, uk
    Posts
    18

    Default dent-removal-brass

    Quote Originally Posted by BaronJ View Post
    Hi Wooly,

    Can you solder a pair of small brass washers to the inside of the lever ?
    Hi Baron. Yes I could solder these washers but why would I? The gap between the lever and the posts was meant to accomodate the spring. Unless I use a spring which mounts somewhere else. Actually I prefer that solution in which case you are right about using washers. Presumably to prevent the key from wobbling? Actually soldering is a bit of a risk because the cap on the end of the lever is soft soldered and I'd have to use a wet cloth to prevent it falling off. But the washers could be done using solder although I'm finding epoxy resin is much easier.
    Looking at the download of my previous post I see the photos of the trombone before and after the dents were removed didn't get sent. I'll try again, Right this is my problem in sending trombone photos. They arrived by e mail and I can't find a way to link them to this post on the forum. They have a reference number img1688.jpg in the e mail section but how do I refer to it in the forum attachments?
    Last edited by woolyhead; 26th Nov 2020 at 01:01 AM. Reason: omission

  2. #32
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    4,195

    Default

    Hi Wooly,

    I don't think that a pair of washers would impact the spring at all, indeed if you didn't want to solder them a dab of super glue would do the same and could be removed if needed with a little heat.

    I've just been looking at the drawing you posted. Is the key solid or folded ? Is the 2 mm you called out a gap or is it a solid piece. Good pictures would make understanding what you can see a lot easier.

    I was looking at a cornet and the spring on the little lever was quite small looking like a pair of chopsticks with a loop of wire at the end. Your drawing seems to show a much more complicated spring, probably to reduce the side twisting of a hairpin spring.

    As far as pictures in an Email simply copy them to the desktop or somewhere you can find them, then go to "Manage Attachments" below the post, click on "Add Files" then click on "Browse" which will open a window on your machine, navigate to the pictures you want to post and click on it. Then click on "Upload", Insert, then "Done".

    HTH.
    Best Regards:
    Baron J.

  3. #33
    Join Date
    Nov 2020
    Location
    Cambridge, uk
    Posts
    18

    Default dent removal in brass

    Quote Originally Posted by BaronJ View Post
    Hi Wooly,

    I don't think that a pair of washers would impact the spring at all, indeed if you didn't want to solder them a dab of super glue would do the same and could be removed if needed with a little heat.

    I've just been looking at the drawing you posted. Is the key solid or folded ? Is the 2 mm you called out a gap or is it a solid piece. Good pictures would make understanding what you can see a lot easier.

    I was looking at a cornet and the spring on the little lever was quite small looking like a pair of chopsticks with a loop of wire at the end. Your drawing seems to show a much more complicated spring, probably to reduce the side twisting of a hairpin spring.

    As far as pictures in an Email simply copy them to the desktop or somewhere you can find them, then go to "Manage Attachments" below the post, click on "Add Files" then click on "Browse" which will open a window on your machine, navigate to the pictures you want to post and click on it. Then click on "Upload", Insert, then "Done".

    HTH.
    Much obliged BaronJ. I'll give it a go soon. Meanwhile the key is solid and the 2mmis also solid. If the washers don't impact on the spring they would have to be smaller in diameter than the coils of the spring. But what would be the purpose of using these washers? With the original maker's springs there was barely enough room to get them in. I'll send the trombone pictures soon. Sorry about the quality of my hand drawn sketches but this object is difficult to draw right. I have moved the photo to documents where it is called scan0008 but I can't seem to pick it up for adding to my forum post. Still working on it.
    Last edited by woolyhead; 27th Nov 2020 at 07:30 AM. Reason: omissions

  4. #34
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    4,195

    Default

    Hi Wooly,

    Thanks for the extra bit of info, I originally got the impression that the key was a folded part, that was why I suggested small washers.

    I look forward to the pictures.
    Best Regards:
    Baron J.

  5. #35
    Join Date
    Nov 2020
    Location
    Cambridge, uk
    Posts
    18

    Default

    Quote Originally Posted by woolyhead View Post
    Much obliged BaronJ. I'll give it a go soon. Meanwhile the key is solid and the 2mmis also solid. If the washers don't impact on the spring they would have to be smaller in diameter than the coils of the spring. But what would be the purpose of using these washers? With the original maker's springs there was barely enough room to get them in. I'll send the trombone pictures soon. Sorry about the quality of my hand drawn sketches but this object is difficult to draw right. I have moved the photo to documents where it is called scan0008 but I can't seem to pick it up for adding to my forum post. Still working on it.
    <br>
    <br>
    Attached Images Attached Images

  6. #36
    Join Date
    Nov 2020
    Location
    Cambridge, uk
    Posts
    18

    Default dent removal in brass

    Quote Originally Posted by woolyhead View Post
    <br>
    <br>
    The attached is my trombone after I removed some of the dents. I used 11mm steel balls for removing those dents lying in curves and an 18 inch by 11/4 inch steel rod for straightening out the big dent which was 7 inches from the bell. I put one end of the rod in the bench vice, very tight and made a wooden jig going down to the floor to hold it even more steady with the rod inserted into the bell end. I then had two hands free for gripping the trombone and pushing the dented part down onto the rod. The jig prevented the rod from moving down towards the floor. Where the brass tubing is creased it takes a lot of force to push it out. I was surprised how clean and even the outside of the trombone looked after doing this work on it. Very pleased. The quality of the photograph isn't very good but at the extreme left hand side you can just make out the two little posts each with a ball on top which are part of the water key assembly. This trombone is very old, probably about 140 years and some of its construction is quaint.
    Attached Images Attached Images
    Last edited by woolyhead; 28th Nov 2020 at 12:11 AM. Reason: omissions

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