[HN Gopher] Guerrilla guide to CNC machining, mold making, and r... ___________________________________________________________________ Guerrilla guide to CNC machining, mold making, and resin casting (2015) Author : Tomte Score : 41 points Date : 2021-06-26 20:36 UTC (2 hours ago) (HTM) web link (lcamtuf.coredump.cx) (TXT) w3m dump (lcamtuf.coredump.cx) | dls2016 wrote: | Timely... spent the day machining a mould for a foam windscreen. | SavantIdiot wrote: | Wow, really short section on gears. But there is so much to cover | I can't blame it. | | If you've ever dabbled in robotics, you've probably found it is | an enormous step function from kits like Actobotix [1] to custom | parts. It is infinitely easier to use kits or frameworks that | have already taken a LOT of the guesswork out of gears, linkages, | motors, compatibility, etc. Especially gears, they are an | enormous pain in the ass to source online, and even when you find | the right gears, you still need hubs and axles, and then you hit | min volume issues, non retail sales, overseas... I even have | access to a phenomenal machine shop, but what I don't have is a | _machinist_. (There are a few that mill around (pun intended) but | they are mostly introverted decent guys that don 't really want | to help a noob.) | | [1] https://www.servocity.com/actobotics/ | paulgerhardt wrote: | Having spent a million dollars making gears, my ultimate | conclusion is it's the sort of thing you machine from brass | gear stock unless you want to spend a million dollars. | SavantIdiot wrote: | For what 99.99% of makers are doing, Actobotix is fine. But | if you want to make your own fancy differential or a | hypercycloid linear translator, yeah, you're gonna have to do | it yourself. | failwhaleshark wrote: | What dimensional scales, materials, turn-around, volume, | and/or processing? | | Breaking tools and getting G-code just right seem like the | perpetual headaches of modern machinists. Other than | occasionally being bitten by a bitchy blade-like chip begging | to fillet your grizzled knuckles one last time before | banishment from the bench to the backyard becycling bile of | betal bits. | | If electricity were cheap (or the electric meter rewindable), | would multiple beam concurrent FDM be a consideration if the | materials and metallurgical characteristics allowed it? I | think at some point, it's easier to print complex shapes | additively than machine them subtractively, and that needs to | be part of structured cost decision-analysis for | manufacturing. | jalgos_eminator wrote: | In case anyone wanted an approachable introduction to machining | your own gears, there's a This Old Tony video about it: | https://www.youtube.com/watch?v=Q-XOM4E4RZQ ___________________________________________________________________ (page generated 2021-06-26 23:00 UTC)