On Saturday 24 September 2016 04:04:22 john mcintyre wrote: > Good Day All, > Problems with machining sticky material. > I find wd40 or crc penetrating fluid in the pressure pack and use the > fine tube nozzle to direct the spray right onto the cutting tip . > This is good for all sticky materials as it stops the material (soft > aluminium) building up on the cutting edge. The cutting edge is > usually HSS with at least 15 degrees clearance on the cutting edges, > the cutting edges have been honed with a fine all oil stone. When > fitting a boss to a hub, as long as the boss and the hub are the same > material (same expansion rate) Machine the boss and hub to a firm > slide fit ( stops misalignment in assemble) then use Loctite 680 or > similar. prep spay both surfaces with activater let dry , then apply > Loctite and assemble ( do not waste time in assembly) And if this is > not enough scotch key them also (belt and braces job)
I thought of that too, making a fit I could spray with activator, tap together with a wooden pad for cushion, test the assembled fit, and draw a line of green threadlocker at the joint. I've put a seating ledge about 20 thou high and it should be in a usable alignment state if driven to that ledge. A side advantage is that should it need to be taken apart, a soaking at 450F in a toaster oven should allow it to be disassembled. The torque value at that diameter should never disturb it, if threadlocker green is soaked into the joint. So thats what I am going to do this morning, boring it another .5mm, test for fit, another .05 mm etc. After I freshen the tools edge. I could hear it skidding some yesterday on the backout move. Ultra cheap brazed carbide tools, $19/kit of 12 over a decade ago. Had to freshen the edges just to cut warm butter. :( Thanks John. [...] Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
