> From: N [mailto:nicklas.karlsso...@gmail.com] > Sheet metal bending. Made first prototype with bending radius same as sheet > metal thickness but but as neutral line is in middle for > bending radius more than twice the sheet thickness I suspect it is a good > ideat to increase bending radius to twice the sheet metal > thickness to reduce stress. Anyone here know anything about or have any > experience?
Haven't touch sheet metal for a while although I do have one of those 3in1 press/brake/rollers. I have the castings and bars made, sprocket inserts turned and inserted. Stepper motor and driver etc. along with a spare ELS for moving the back fence. Just never got around to finishing a proper bench for the unit before adding the computer control. The software for the ELS was going to take into account what is called K factor. The AlibreCAD software sheet metal section allows you to specify the thickness, the K factor and the bend radius so that holes on either side of the bend end up at the correct position. It's one of the biggest reasons I have stayed with Alibre. Anyway, sheet metal also has grain. That means in effect the K factor is different when you bend it across than with. The harder the metal the larger the radius needed or the bend will crack. So 2024-T351 used for aircraft when bent sharply cracks. Here's a bit more information. https://www.shapesbyhydro.com/en/material_properties/here-are-the-best-aluminium-alloys-for-bending/ John > > Have at last had time to calibrate position gain with micro meter mesurement > on machined metal part and also machine my first > prototype part. Mikrokator is the most accurate measurement device I know > about but although a machined part could be measured I > am not immidiately sure if or how it could be done to measure machine > accuracy. Anyone here have any idea how to measure it more > accurately? Or where to find more information on how it shoulb be done? > > Decided it was time to get E-mail, payed for with a small fee instead of > freely available. Anynone it it's possible to change address or I > have to subscribe again? > > > Regards Nicklas Karlsson > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
