Thanks Chris. I haven't needed the handle all that badly or I would have done something. What I also just noticed is the plastic handle is held with a rivet into the top of a larger extension. New drawing attached.
But what I've found lately is my biggest issue with CNC is work holding. So start out with a block and turn the 7mm shaft to a depth of 17mm on the lathe or held in a vise and mill it round. At this point in the 4th axis could grip this and the profile of the handle could be done with it held horizontal. Then rotate to the correct angle from narrow to the wide end so the end with the slot is wider than the knob end. Flip it the other direction in the 4th axis and do the same horizontal motion that creates the expanding in size end. Likely the round part by the knob could also be milled around. Rotate it so it's vertical and cut the slot? Way more work than using the mill to cut the slot on the end in a piece of steel. Heat and bend. A bit of grinding and a hole to hold a screw for the handle and it's done. Crude but as I said at the start. This is more an exercise in how to use CNC than solve a problem. John > -----Original Message----- > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: October-12-21 10:00 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Replacing a handle. > > Objvoiuly you could redesign the handle to use some parallel sides and it > would be easy to make. But I assume this is an exercise > > Repair would be the easy way to go. Mill off the broken fork side and use > a plate to replace it taach the plate with small screws. > > 3D printing would be easy and you might even send the design files to an > outfit who can print in metal. They can print stainless steel or even > gold. So printed does not have to be plastic. > > But if you were to mill this, the trick is to make the clamp tools. For > example if you make a taper then the handle (and the taper) fit in a > milling vice. You would end up making a set of custom tapered clamp shims. > The shims can be machined or printed > > I would just repair this. > > On Tue, Oct 12, 2021 at 8:36 PM John Dammeyer <jo...@autoartisans.com> > wrote: > > > This has nothing to do with LCNC specifically. Really more a how to use > > LCNC. > > > > The attached picture is of a broken tripod crank handle that clearly was a > > casting. > > > > I can't figure out how I'd hold the raw stock to machine it. The slot > > would be easy. But the angles and tapers and curves go in three different > > dimensions. > > > > Maybe a stub on the end held in a 4th axis? > > > > Any suggestions are welcome. > > John > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users
TripodCrank.stp
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