[AT] repairing machined arts

Tue Dec 10 18:54:19 PST 2019

I’ve mentioned here before that I got a Lulzbot TAZ-6 3D printer in a professional raffle.

I’ve used it enough to know that the real value for average antique tractor folks is in making patterns for molds.  I did make a small pulley that was a very unusual size for a non-antique tractor application and it has held up well.  But it was for a small fractional horsepower motor and there is no real torque applied.  The motor has since died before the pulley.  Besides maybe the occasional knob for a dashboard control or other odd small non-metallic piece (I made an insulator for a magneto once) I can’t think of too many other antique tractor uses.

Getting it into a drawing is non-trivial and filament choice for the print is pretty critical too.

Spencer

Sent from my iPhone

> On Dec 7, 2019, at 12:20 PM, Stephen Offiler <soffiler at gmail.com> wrote:
> 
> 
> The bronze is infiltrated into the pores in the steel part after the 3D printing process.  That's not helping in any way to keep to fine steel powder from wanting to oxidize before the 3D printing process even begins.  The info is out there and I haven't found it yet.  Either the "steel" being discussed is actually closer to a stainless steel, or there is some kind of protective environment, or *something*.  Not saying that steel 3D printing isn't a thing; just saying it's got a challenge associated with it that isn't a factor in less reactive metals like titanium, aluminum, fancy nickel alloys (common in aerospace) etc.
> 
> SO
> 
> 
>> On Sat, Dec 7, 2019 at 11:32 AM <szabelski at wildblue.net> wrote:
>> I believe they add bronze to the mixture when doing steel (???). Again, if I get the time this weekend, l’ll try to do some research.
>> 
>> Carl
>> 
>> ----- Original Message -----
>> From: Stephen Offiler <soffiler at gmail.com>
>> To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
>> Sent: Sat, 07 Dec 2019 07:35:57 -0500 (EST)
>> Subject: Re: [AT] repairing machined arts
>> 
>> The short answer here is "any metal that can be made into an extremely fine
>> powder".  Steel and iron present a real challenge as the extremely small
>> particles want to oxide very quickly.  Not sure how they're getting this
>> under control (suspect alloys and/or inert gas environments) but 3D folks
>> are claiming steel capabilities.
>> 
>> SO
>> 
>> On Fri, Dec 6, 2019 at 9:42 PM <szabelski at wildblue.net> wrote:
>> 
>> > Using 3D printing for metal parts consists of laying down a film of metal
>> > powder that is fused together by laser. You just keep applying layers of
>> > the metal powder to build up the part. The laser only fuses the powder were
>> > the CAD model tells it to.  Although the process it similar the 3D printing
>> > of plastic parts, there no plastic involved. Not 100% sure which metals
>> > they can do that way, but I believe titanium, aluminum, steel, bronze, (and
>> > I also believe maybe iron), parts can be made.
>> >
>> > Carl
>> >
>> > ----- Original Message -----
>> > From: Ken Knierim <ken.knierim at gmail.com>
>> > To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
>> > Sent: Fri, 06 Dec 2019 20:38:10 -0500 (EST)
>> > Subject: Re: [AT] repairing machined arts
>> >
>> > Yes, they have a Mythbusters Junior show (which inspired my son to want to
>> > be on the show) and some other spinoffs.
>> > As far as printed parts taking over for more traditional (casting and
>> > machining), I still believe in "good, fast, or cheap. Pick 2".
>> > I use printed parts in different designs but nothing seriously structural.
>> > And if I want something to last, it's usually NOT plastic.
>> >
>> > Call me old fashioned.
>> >
>> > Ken in AZ
>> >
>> > On Fri, Dec 6, 2019 at 3:57 PM <szabelski at wildblue.net> wrote:
>> >
>> > > If you remember the TV series “Myth Busters”, there is a new show emceed
>> > > by one on the guys (believe it’s Jamie), who does a lot of similar things
>> > > to what they did on MB. I caught one show where they were making an
>> > Ironman
>> > > suit made from titanium so they could prove/disprove some of its
>> > > capabilities. Some of the parts for the suit of armor were made using 3D
>> > > printing and powdered titanium. Didn’t take that long to make the parts.
>> > I
>> > > think I also saw a program somewhere were something was being made using
>> > > powdered iron (????).
>> > >
>> > > Don’t know how well other metals could be adapted to a process like that,
>> > > but if the technology can be properly developed, and the cost can be kept
>> > > down, could this be the beginning of the end for all types of
>> > machined/cast
>> > > parts? If so, would a repair shop still have to carry a large inventory
>> > of
>> > > parts, or just make a needed part using a 3D printer and the proper
>> > > material on the spot as needed?
>> > >
>> > > “Yes sir, you say you need a new engine block for your 1920 vintage
>> > > tractor? Just come back tomorrow and it’ll be ready.”
>> > >
>> > > Carl
>> > >
>> > >
>> > > ----- Original Message -----
>> > > From: Ken Knierim <ken.knierim at gmail.com>
>> > > To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com
>> > >
>> > > Sent: Fri, 06 Dec 2019 15:16:47 -0500 (EST)
>> > > Subject: Re: [AT] repairing machined arts
>> > >
>> > > Some progress has been made toward taking digital photographs of the
>> > > original part and creating a 3D model from them (photogrammetry). I have
>> > > the software (as part of a 3D printer package) but have not tried it yet
>> > so
>> > > I cannot vouch for the accuracy. I'm still new to 3D printing but we've
>> > > already put several parts into production systems... it's got its place.
>> > > The photogrammetry process might be a decent place to start if you want
>> > to
>> > > make a casting but I'd question accuracy for finished parts. The laser
>> > scan
>> > > technique would be better in my opinion.
>> > >
>> > > Something along similar lines for making parts is 3D metal printing. The
>> > > Rutherford rocket engines are made using this technology. It uses an
>> > > electron beam rather than a laser for melting the metal and requires a
>> > > vacuum chamber for manufacturing but obviously works with high pressures
>> > > and temperatures.
>> > >
>> > > Photogrammetry software:
>> > > https://all3dp.com/1/best-photogrammetry-software/
>> > >
>> > > Rutherford rocket engine:
>> > > https://en.wikipedia.org/wiki/Rutherford_(rocket_engine)
>> > >
>> > > I see these as interesting ways of creating parts. As with anything, it's
>> > > going to take some work to perfect. I doubt it would be affordable for
>> > > tractor parts for awhile.
>> > >
>> > > Ken in AZ
>> > >
>> > >
>> > >
>> > > On Fri, Dec 6, 2019 at 10:48 AM Jack <jacktractor at live.com> wrote:
>> > >
>> > > > The shortcoming of this for the repair of unavailable tractor parts is
>> > > > that you need a Cad file of a good part first.
>> > > >
>> > > >
>> > > >
>> > >
>> > https://www.imeche.org/news/news-article/feature-retrofit-transforms-legacy-machine-tools-to-keep-worn-parts-in-use?utm_campaign=PE%20newsletter%2C%206%20December&utm_source=email&utm_medium=PE%20Newsletter
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