> -----Original Message----- > From: Marcus Bowman [mailto:marcus.bow...@visible.eclipse.co.uk] > Sent: October-10-17 11:56 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] MachineKit on the BeagleBone Black > > > > > Impressed by the efficient use of casting to make what would otherwise be a > welded or fabricated conglomeration of parts. Did you cast your own or make > the pattern? > > Marcus
Both. Made the pattern, cast it and machined it. In this case it's old Honda Intake Manifolds. Most of the time I use my CNC router to make the patterns. In this case the motor plate buttons were taper turned on my Gingery Lathe using the ELS to give me 3 degree draft. The shaft spacers are turned from a casting sprue. Turned down to 25mm. Drilled to 1/2" and then parts are bored to 17mm depending on where the spacer sits. Depths of holes are controlled by the ELS after touching off the face. I also had to enlarge the hole in a steel washer so the original lock washer wouldn't mangle the aluminium spacer. As always there are things I would do differently. For example I thought I'd installed the 18T pulley but it was the 24T. When I tried a Y1.000 move it went further than it was supposed to. A Y0.2 should have made it do one revolution of the lead screw (5TPI). I wondered why the belt was so tight. One I replaced the pulley with the correct one I appear to be matching my Shumatech DRO within 0.001". That's with the backlash in the ini file set to 0.008. I have yet to try moving to a point from either direction to see if that all works correctly. Even with the 18T pulley it's still scary fast at 150 TPI. Oh and the Knee castings are also made with a two part pattern with room for extra angular contact bearings with a custom spacer to move the bevel gear so the knee backlash is close to 0. Ideally I'd rather drive the knee screw directly but this si fine for now. John ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
