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Discuss any sort of mechanical stuff here: positioning systems, gears, extruding methods, etc.
Re: Did belt tension break my stepper shaft? - 9 years ago
"had recently tightened it in such a way that it would sound like a low note when plucked." Hard to say, but that tells me that the tension was too tight. Could be cheap,low grade, metal shaft material. It's not good on other components, if you are plucking too many notes. That's coming from a Machinist and Musician. You should witness the slack/slop, in belts of large equipment; especiallby Metalmann - Mechanics
Re: Make a 3d printer nozzle on a drill press - 9 years ago
Nice work! I bet most here, would be terrified to do/try that. Over the years, I've had to make a few small parts on the DP, when the mills and lathes would be tied up in hotter jobs. From the way you are presenting your files to the workpiece, I'd guess that's not your first DP piece. Everyone knows that a DP, and Grinders, are the most dangerous tools in the Machine Shop, but you did a goodby Metalmann - Look what I made!
Re: Would knurling the bolt work instead of hobbing it? - 10 years ago
Should work fine, if the knurls are clean and deep enough. Like 3Dmaker said, depends on the hardness of the filament.by Metalmann - Mechanics
Re: Fully working, 3D printed replacement zip slider - 10 years ago
That is some fine work!!by Metalmann - Look what I made!
Re: Do you need a 2-nut & spring anti backlash arrangement on a vertical leadscrew? - 10 years ago
Sorry, just noticed that it's not your video, or machine.by Metalmann - Mechanics
Re: Do you need a 2-nut & spring anti backlash arrangement on a vertical leadscrew? - 10 years ago
"Do you need a 2-nut & spring anti backlash arrangement on a vertical leadscrew?" Maybe, but in that video....that leadscrew needs straightening first. Warped too much. Do have a cheap dial indicator, that you can use to straighten that threaded rod? Being that warped, it may screw up any other adjustments or improvements you make....with that much runout, gravity will not help you muchby Metalmann - Mechanics
Re: Use pulley as idler - 10 years ago
Quotestahlsau in industry it is common practice that the belt is run over idlers without teeth. It IS important that the minimal radius of the belt isn't underrun, this would make it wear much faster, but the idlers without teeth are totally ok. Yes, there were a few times I'd chuck them up in a lathe, and turn down the teeth quickly.by Metalmann - Mechanics
Re: Ambient air temperatures - 10 years ago
Out of curiosity, what is your internal cabinet temp., after running for about an hour? after 2 hrs?by Metalmann - General
Re: Could holes be made in the sides of the nozzle - 10 years ago
Can you mill a small, flat surface; before starting your side holes? That will prevent "Wandering". Do the side holes, go all the way through? In other words, how deep will the side holes be?by Metalmann - Let's design something! (I've got an idea ...)
Re: Anyone know about Cams? - 10 years ago
There are so many types of cams out there, can you fabricate one out of aluminum plate? Or, thin steel; if more strength is needed?by Metalmann - Mechanics
Re: attaching threaded rod to idler bearing ? - 10 years ago
AVRkire Wrote: ------------------------------------------------------- > I am building a new Z axis, and I wanted to try > attaching my z axis to my idler bearing by > tigheneting a nut on both sides of the idler > bearing. > > So I am using a 10mm threaded rod, and a bearing > with a 10mm inside diameter. and simply tighten a > bolt against eiether side of the bearing toby Metalmann - Mechanics
Re: Could holes be made in the sides of the nozzle - 10 years ago
Here's an example of a "Sensitive Drill Press".: Third tool down, but they get awful pricey. You can do the same thing with a Foredom, using a light touch......"Machinist's Feel".by Metalmann - Let's design something! (I've got an idea ...)
Re: Could holes be made in the sides of the nozzle - 10 years ago
Yeah, I don't see that part either.....unless he meant "Stopped holes"? Just like a dental handpiece. Fantastic tools, used them almost everyday, while grinding and polishing dies at work. Retired nowadays, but couldn't live without my Foredom.by Metalmann - Let's design something! (I've got an idea ...)
Re: Could holes be made in the sides of the nozzle - 10 years ago
cozmicray Wrote: ------------------------------------------------------- > That video is drilling center hole! > That is pretty amazing video > but I don't think a common acorn nut provides a > smooth chamber > for filament flow? > > Jasper is drilling 4 holes at a right angle to the > center axis. > and some how not piercing the center channel to > attach >by Metalmann - Let's design something! (I've got an idea ...)
Re: Could holes be made in the sides of the nozzle - 10 years ago
cozmicray Wrote: ------------------------------------------------------- > Rep Rap is printers making other printers > What does this have to do with that. > > Drilling small holes thru a small 1/4" acorn nut > NOT easy! > Avoid drilling thru central hole even harder. > > Have you ever done any machine work? > > Eiminating a 2 cent block of aluminum to eliminate &by Metalmann - Let's design something! (I've got an idea ...)
Re: Could holes be made in the sides of the nozzle - 10 years ago
Jasper1984 Wrote: ------------------------------------------------------- > > Eliminating a pressure vessel that is mandatory > > You say it like a teacher told you with authority. > Not convinced. > > I havent machined(substractively), however, the > feasibily of drilling is easily sufficiently > plausible for me, it'd basically be > t > his approach, but withby Metalmann - Let's design something! (I've got an idea ...)
Re: Use pulley as idler - 11 years ago
DennyCrane Wrote: ------------------------------------------------------- > Please leave your thoughts on using a second > pulley as an idler in a pulley belt assembly. > Obviously it would need to rotate so perhaps > attached to a shaft and two bearings. It seems > every idler I've seen simply uses a few side by > side bearings constrained by washers. > Disadvantages to thisby Metalmann - Mechanics
Re: Smooth rod straightness requirement, how straight ? - 11 years ago
Here is a good source for shafting: .250 diameter on up....by Metalmann - Mechanics
Re: Precision Movement at a Distance - 11 years ago
Something I've noticed by looking at the pics on this site, some of the holes for the shafting look like they were just drilled. For a good sliding fit, all the holes should be reamed.by Metalmann - Mechanics
Re: I "slightly" modified my cofee table 
- 11 years ago
Nice project, especially the Geneva Stop Mechanism.by Metalmann - Look what I made!
Re: Woman's Torso Print (NSFW) *Nudity Warning* - 11 years ago
Don't you wish they were all built like that??by Metalmann - Look what I made!
Re: Basic Mechanics for 3D Printed Parts - 11 years ago
I would say about the most consise book you'll find regarding properties of materials, and Mechanical Engineering is : My 1942 edition, has served me well since the 50s.by Metalmann - General