I would send the .dxf to the laser shop and collect the cut-and-bent parts in a few days. Some parts are not worth machining when there's a far easier practical solution.
Roland On Tue, 3 Aug 2021 at 23:31, John Dammeyer <[email protected]> wrote: > That's a good suggestion John F. Thanks. I did do some more playing > around and it's clear the part flexing and the backlash both were at fault > especially with the plunge to the next depth. > > And that brings up another issue. One of my pet peeves with electronics > project magazines is they are great at a schematic and either point to > point wired or PC board but very little energy is spent on describing > various ways of mounting or installing in a cabinet. Especially with the > concept of Human Factor Engineering which is the practice of making > something easy to use or even intuitive. Like an ESTOP button is always a > red mushroom Not a toggle switch. > > Same goes with work holding. Youtube has tons of videos that show a > tiring sequence of a milling cutter sprayed with coolant making chips for 3 > minutes with 3 commercials interjected, one every minute. But very little > on work holding. > > The next part I am making is shown in the attached screen shot rendering. > My raw material is in the second photo. So the question is about work > holding and how or what features of LinuxCNC can be used to make this > easier. > > I can use my band saw to create the initial width and split it into two L > shapes. But after that I start to have problems, due to lack of experience > I think, on how to firmly hold it and mill the stuff with a 5mm and 6.35mm > (1/4") cutter. > > Suggestions? > > Thanks > John > > > > -----Original Message----- > > From: John Figie [mailto:[email protected]] > > Sent: August-03-21 11:59 AM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Something went wrong. > > > > Speaking of backlash. My tiered old Bridgeport has about 0.002" of > backlash > > in the ballscrews. So if circular interpolation is used there is a small > > bump at each 90 degrees of the circle. But if I make the finish pass > first > > clockwise and then repeat counter clockwise the imperfections are much > > smaller. I know from experience with my first CNC machine that's built > that > > actually used leadscrews with lots of backlash the clockwise followed by > > counter clockwise method was remarkable compared to a single direction > > final pass. > > > > John > > > > On Tue, Aug 3, 2021, 10:10 AM jrmitchellj <[email protected]> wrote: > > > > > You might try the run again without the backlash compensation in LCNC > to > > > get a feel of what it is actually doing. > > > > > > > > > --J. Ray Mitchell Jr. > > > > > > > > > �I predict future happiness for Americans, if they can prevent the > > > government from wasting the labors of the people under the pretense of > > > taking care of them.� > > > > > > THOMAS JEFFERSON > > > > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
