Stuck Trumpet Valve: How to Use Ground Casing Mandrels

This video is about ground casing mandrels and how to use them to fix stuck valves if it is due to damaged casings.
Ground Casing Mandrels can be purchased from Ferree's Tools. Here is the web site:
www.ferreestoolsinc.com/products/n58a_brand?variant=16809779652
Here is the link to several videos that I have in the play list, "How To Repair Stuck Piston Valves"
• How To Repair Stuck Pi...
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[@tedjohnson9329]

I followed his examples in this and other videos to the letter to fix valve and case problems with my Bach model 198 trumpet. It now works pretty good, I still have some lapping to do on a new valve. The point of this comment is that no repair shop within 50 miles would touch my trumpet, and I've received valuable lessons on what to do. So, I'm on the way to restoring a beautifully playing trumpet

[@dukahn7820]

I am from south Korea. Many thanks for the video clip. It is very useful information to understand why my 1st trumpt valve slowly pops up.

[@iansdigby]

Another really helpful demonstration of a quite tricky technique. Thanks!

[@oldtimedrumcorps]

thanks, interesting Have #2 valve casing with a small high spot (shiny) inside at the bottom 1/32 in. about 3/8 in valve hanging up in bottom . Valve sticks a bottom of stroke .Getting it repaired

[@ftera4]

Excellent videos. Thank you for doing them.

[@edgarargueta895]

This video was very helpfull we send a lot of thanks. You also saved us a lot of money.

[@bdrepairs7046]

Great info! Thanks for sharing!

[@johnclark5182]

Great video. Thank you!

[@gracewooley9263]

thankyou its exactly what I needed to know 👍

[@ricklundquist1883]

Have you ever done a video using the adjustable valve reamers from Ferees?

[@moisesfernandes9733]

Sir, how are you? thank you very much for your uploads!! Can I ask you if you bought does tools for the inner casing our if you got them made by yourself? greetings Moisés Fernandes

[@TheBrassandWoodwindShop]

Hello Fernandes, I made 2 of the mandrels when I was in college, but they are hard to make without the correct equipment. It is better to buy them from Ferree's Tools. Thank you for your question, Art

[@377559]

Thanks for your very informative videos! I have a Yamaha euphonium that seems to have this problem. I would like to try repairing it myself. What size ground casing mandrel I should purchase? Feree's website gives many different sizes but does not say which ones are for which instruments. Can you help? Also, can you tell me the correct size mandrel to purchase for Besson tubas? Thank you. And please keep producing all those excellent videos.

[@pauls5745]

you could use a vernier caliper to measure the inside diameter of the valve. 6" digital calipers are not too expensive and it's a nice tool to have if you replace parts or repair instruments

[@377559]

@@pauls5745 Thanks for replying Paul. These mandrels must be exact. I have found that most calipers do not have sufficient precision to measure to the one thousanth of an inch reliably. Taking measurements from ground casing mandrels I do have shows that I am usually about 1-2 thousands of an inch out - even when I use my iGaging calipers. So I do not trust my own measurements.

[@mmmscrumptious8247]

What a great video, however, I have been using this technique for my second valve and it helped somewhat but it seems I can't get in at the right angle to fully smoothen it out and it stil won't go all the way down or it gets stuck. Do you have any advice for the doing the middle valve specifically?

[@TheBrassandWoodwindShop]

There may be something else wrong with it too. Watch this video and see if it helps. kzbin.info/www/bejne/m4KVapZtnLWikKc

[@javierquesada798]

cómo se pondría arreglar la yave de octava del cuerpo de el saxofón ? gracias

[@377559]

What size ground casing mandrel should I use for the casings on yamaha euphoniums and Besson tubas? The Feree's website does not give this information. Thank you.

[@MichaelGawesebmainone]

Any recommendations on where to obtain ground casing mantrels or any suggestions on possibly of making it, perhaps with support by (car) engineers.

[@TheBrassandWoodwindShop]

You can get them from Ferree's Tools. You just have to know the exact size that you need. I have made two of them when I was in college, but you need special equipment that is very rare. I do not think that car people would have it unless they make pistons. Here is the link to Ferree's: ferreestoolsinc.com

[@hjk2718]

Thanks for the video. A question. How would the mandrel get into the dented casing in the first place? I measured the OD of the piston to get the correct size but it would not slide into the casing. So do I need to get a size slightly smaller than the OD of piston?

[@TheColorField]

The end of the mandrel is tapered smaller so it can get by small dents.

[@scottydelt]

Very cool video. I have one question. I picture dents being concave (inside the valve). How does hammering the outside of the valve fix them? It seems like the hammer would push the dent in the direction it's already facing and have no effect.

[@TheBrassandWoodwindShop]

Because the mandrel is the same size as the casing and it is made of steel, tapping on the dent causes the mandrel to push out the dent from the inside.

[@scottydelt]

@@TheBrassandWoodwindShop Thank you that does make sense when you put it that way!

[@chaseshaw9130]

Where are you located? I'm having trouble finding a shop with your tools and knowledge and need a repair done.

[@kaneyoufixit1408]

Hi Art! Great video. I have a question - do you lap the valves with lapping compound? Thanks in advance.

[@TheBrassandWoodwindShop]

Sometimes I lap the valves, but only when it is necessary. I use the Ferree's Ultrasmooth lapping compound.

[@kaneyoufixit1408]

@@TheBrassandWoodwindShop Thank you for your reply and keep up the amazing videos!

[@kenagankecilvita8801]

good morning sir, how do you fix a bent piston from falling

[@TheBrassandWoodwindShop]

That is hard to explain in words, but I am planning on doing a video on that soon. I will try to let you know when the video is published.

[@thecopperiris]

What kind of clearance should the valve have in the cylinder? I have a old Sousaphone and 2 of the cylinders are out of round. The valve measures .975". What size mandrel should I get? .976 or .978?

[@TheBrassandWoodwindShop]

That is hard to answer without taking some more measurements. It depends on how loose the valves are. The .976 will probably fit in there with no problem. It may be too loose though. There is a good chance that the .978 will not fit. It would be better to have it a little too loose than not go in at all, so I would go with the .976. I hope this helps.

[@karlhubben8009]

Are this mandrels tapered?

[@trptguy23]

Could a scratch on the casing cause the valve to stick? I have a tuba with a stuck third valve and I'm hoping it's the scratch

[@TheBrassandWoodwindShop]

It is possible that a scratch could cause a valve to stick, but there are many other reasons for this too.

[@ramenkaaru]

what size should i use for my yamaha ytr-136

[@TheBrassandWoodwindShop]

I am not 100% sure on this model, but most Yamaha trumpets are .664.

[@jasmineschannel3865]

How much should I expect to pay for a repair on one of the valves in casing

[@TheBrassandWoodwindShop]

In my shop I would charge about $25 to $35, but it varies widely depending upon where you are in the world.

[@danielepearce5235]

I'm really really trying to find a cheap ground casing mandrel for bach trumpet..644 can't find one anywhere it's really infuriating..

[@ricklundquist1883]

Can you tell me what size mandrel I would need for a 50's vintage Olds Ambassador cornet?

[@TheBrassandWoodwindShop]

I think it is .664, but i am not positive. If you order one from Ferree's Tools, they will know what size you need.

[@ricklundquist1883]

@@TheBrassandWoodwindShop You were absolutely correct. I ordered it and it did the job. 3rd valve casing was badly out of round and with that tool and your video I fixed it properly! Thank you!

[@TheColorField]

I'm wondering why you would tap a dent TOWARDS the mandrel. That seems counterintuitive.

[@pauls5745]

son's Muslady trumpet taken to the shop to fix folded bell and stuck valve, quote $150. toss horn in trash, buy a new one on Amazon for $120

[@alext9067]

Do schools ever employ people to care for and repair the various instruments used in their bands and orchestras?

[@TheBrassandWoodwindShop]

There are a few school districts that have repair departments, mostly in larger cities. I do not know of any specifically, but I have heard of it a few times. I just cannot remember where. If anyone is reading this and knows of any, please reply to this comment.

[@alext9067]

@@TheBrassandWoodwindShop Sounds like an interesting job. Either feast or famine, depending on how crazy the kids are. I can't believe the amount of damage you guys are asked to fix. Excellent videos, btw. Thanks for that. I always look for them and watch carefully. Thanks again.

[@johnbrock1602]

Could you talk Slower very good info

[@karlhubben8009]

Sorry, you already explained this, the mandrels are tapered a bit at the top! Olds is 0,670....!