going through my messages, heaps of "XXX wants to connect" messages about fixing the stepper coupler/mount eccentricity. I simply dont have time as I have many many messages from girls in my neighbourhood that want to connect with me and will show me "bobs and vagene" for just my credit card details.. priorities..
1. you probably don't need to do this, its more likely you have not leveled properly or your FEP is loose. you will know you need to do this, if no matter how much lube you add you have a persistent, regular grinding noise from machine even after tightening/loosening the travel chuck and/or you can visible see eccentric motion at the bottom of the lead screw.
2. To find out if you need to do this, buy a dial gauge, any CNC supplier, I have a few, I used the magnetic mount one and ran it against my lead screw, even for experienced machinists taking a reading from a lead screw is tricky because , well, its not a cylinder, its a screw. If you spent enough on your dial gauge (costs more than the photon), you can read max and min deviation from the edges of the rail.
3. If you are cheap (you bought a photon, the cheapest printer you could find, you ARE cheap, you pick flowers from the neighbors yard instead of buying for your wife, and you are reading this from a linux computer..), then you can simply rest a block against the lead screw and see if the block moves at all while turning the lead screw.
4. If you have eccentric motion, then, and ONLY then, remove the stepper and its coupler (the thingomajoozit that mounts the stepper to the photon. cover your screen, use a spindle (drillamajoozit) to open the holes in the photon by an additional 0.1mm (deviation was ~70um in mine) and remount loosely. hand tighten the bolts allowing some slip. spin the lead screw by software with your measuring tool in place. use a light object (i used the back of a kitchen knife) to tap left/right or front/back as required, until you have sub 10um deviation (read point about how hard it is to read deviation on a lead screw)
5. lock down screws another 1/4 turn, repeat point 4, most likely you moved it while tightening.. rinse repeat, then lock it down hard.
6. Bonus info: If your lead screw has yaw/pitch compared to the rail, raid your wife's pantry for aluminium foil, for the Americans, that is pronounced A as in cat, lew as in in lieu, mi as in me, ni as in the knights that say NI!, um as in yoom. Learn to pronounce it properly, you are butchering the queens English.
Now. assuming your lead screw is not bent (mine was, took a mallet to it, whole different measurement saga, worth checking before doing anything else from here on), measure the left and right extremes of the top of the lead screw to the left and right of the rail, loosen the rail assembly or the stepper, your choice, and fold some aluminium under the opposite side of the worst error, re-tighten, remeasure, add more or less AL until you get max deviation under 50um top to bottom.
HTH.
(all the CNC guys are going "ahhhh same as tramming a 4th axis, ya, kinda. )
翻譯年糕
