Czx7 Posted yesterday at 12:35 AM Share Posted yesterday at 12:35 AM Im working with some 5/16in tooling from woody’s and pressing whistle. I have had multiple burst while pressing and Im wondering if there is a better pressure to build these motors with whistle? Any tips would be much appreciated. Link to comment Share on other sites More sharing options...
Czx7 Posted yesterday at 12:37 AM Author Share Posted yesterday at 12:37 AM (edited) I have not been using my force gauge as much on these little motors and have just been going till it feels nice and compacted. I may have to make a tube support for them but my main issue is the best pressure for these 5/16in motors. Another question, would a arbor press be better for these motors? Edited yesterday at 02:24 AM by Czx7 Addition. Link to comment Share on other sites More sharing options...
Arthur Posted 16 hours ago Share Posted 16 hours ago If you've only a narrow range between bursting the tube and being under pressed, you could look at the tubes and a support. Have you tested these? If there really is only a small window of pressure between fail and fail you need a pressure gauge to keep within the sweet spot. Otherwise look at thicker stronger tubes and/or a tube support. However a tube support commits you to one size of tube OD and ID for ever. Smaller increments may make the compacting more uniform. Link to comment Share on other sites More sharing options...
Czx7 Posted 13 hours ago Author Share Posted 13 hours ago Thanks for the info. The window has not been that small but, I have not been using my force gauge because I have not know what would be the best pressure for these smaller tubes. I tend to get the best results with whistle at 7000-7500psi on whistle but I don't totally know how that transfers to these smaller tubes. Link to comment Share on other sites More sharing options...
FrankRizzo Posted 13 hours ago Share Posted 13 hours ago (edited) Yes, an arbor press is much better suited for that loading pressure. Edited 13 hours ago by FrankRizzo Link to comment Share on other sites More sharing options...
Czx7 Posted 10 hours ago Author Share Posted 10 hours ago Im thinking that I need to buy another force gauge because the one Im using is rated quite high for these rockets. What would you guys recommend for a pound rating on the gauge for the 5/16 whistle rockets. Link to comment Share on other sites More sharing options...
DavidF Posted 10 hours ago Share Posted 10 hours ago You can make up a cheap tube support for any length and not worry about OD variations with a piece of mylar 0.005" thick. There's a thread about it somewhere on here. It's not complicated. The mylar is rolled up so that the tube just slides in, with a friction fit. Rubber bands on the outside keep it under control. It's then tightened onto the tube by rolling it tight. The piece of mylar for that size rocket might be 4-5 feet long when rolled out. I can provide more details if you want or need. You can press a whistle rocket to 7000psi with it. I used to make them out of brass, but it's too springy, hard to work with, and expensive. The logic of how it works is in a video I made a long time ago. It details a brass support, before I tried mylar. Same idea though. For small rockets like those an arbor press with a torque wrench to set the force is best. Link to comment Share on other sites More sharing options...
Czx7 Posted 10 hours ago Author Share Posted 10 hours ago (edited) Thank you I will defiantly look into Mylar for these small motors. Do you think that I need to get a lower rated force gauge because I can work with an arbor press but I don’t have a torque wrench available to use. Edited 10 hours ago by Czx7 Link to comment Share on other sites More sharing options...
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