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#15
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Re: pic: 6in Butterfly Module With Piston
Some items to ponder on this design, but it looks like you are making progress!
![]() Pic 1: -The black arrows show close proximity of the standoff bolts, the stiffness gain is minimal, you may consider spreading them around to increase the stiffness or eliminating a bolt from the pairs. -The blue arrow shows the force applied through the module into the cylinder, and the red arrows are the resulting vectors. This places a moment indicated by the second red arrow and creates a high stress area. Whether the .25" plate will yield or not would have to be determined for the application, but the long mounting point increases deflection and reduces stiffness. This would be unwanted for turning in a tank drive with traction wheels as less stiffness will increase bounce during turning. Stiffness is required to allow the wheels to break traction to scrub smoothly. There are many ways to increase stiffness, Skywalker gave one good solution: Quote:
-.25" material is plenty thick to tap, the nuts circled may be eliminated by tapping into the back plate. Pic 3: -The blue arrow shows the restriction the .25" plates on the top on bottom rails provide, however, there is no loading in that direction. The bolts also restrain the part for rotational loads. It appears this is an attempt to use the pre drilled holes for assembly, if so, the plates could be removed afterwards to reduce weight and be used as an assembly fixture only. -The green circles are suggestions for rivet locations. They are lower weight than bolts and easily hand assembled. The rivet holes in the .25" can be laser cut like you want, the plate clamped into position, then the frame rail drilled, and then riveted. -The red arrow is a suggestion to move the pulley to the outside of the wheels to reduce the bending moment on the axles. Quote:
Quote:
Do you guys have more information to support these feelings? |
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