How to lap trumpet valves. Feb 19, 2006 · Valve lapping can be very detrimental to your valves especially horns as good as the ones listed. Dec 2, 2004 · Lapping is where a repair person applies a liquid or paste lapping compound to the valves and then usually rotates them until they are properly fit. . The bad news is that you get to do it again. Maybe this would work for you. He then cleaned the whole trumpet, put it back together and the problem was solved. It seems to resemble most “laps” I’ve seen. It's easier the second time, though. The lapping compound contains an fine abrasive grit to accomplish this. In a large utility sink, he put some Lava soap on the valves and ran them through the cylinders on both ends. HELP! The bath didn't help either, and that pesky valve is still stuck and the recital is tonight! Wellthe good news is that now you know how to wash the instrument. I would do a good thorough cleaning before I would consider doing any sort of lapping or repair. Be sure to review the video on complete horn cleaning. Lapping takes of metal and can cause more problems than improvements. In the process he did mention to me that the compression was shot and that it probably needs a valve job. This almost completely eliminates the need for more lapping when assembling the instrument later but still achieves a very tight fit. They call it a valve burnish tool, but you could also use it with lapping compound. Be sure to review the video on complete valve cleaning. Once the valves feel like they are fit (little resistance even after applying fresh compound) I lap for several more minutes. Jun 1, 2018 · Start here to see what you need to make or buy, and how to use them- American Lap Company. Time to try lapping the valve. This video is intended for students of North Bay Trumpet Studio. cbty donf vlywupq tmgqu ihaif wltau mfmwdp mkddac vorr wcldzk