[AT] repairing machined arts

Sat Dec 7 04:33:19 PST 2019

I'd question the lower cost thing in general terms, but you said "can be"
and I'd agree that definitely as the complexity goes up, you reach a point
where the metal part might be extremely difficult to make with traditional
methods, and yet a walk in the part for 3D printing - there, yes, I can see
the cost equation tipping to 3D.

SO

On Fri, Dec 6, 2019 at 11:11 PM <szabelski at wildblue.net> wrote:

> I don’t claim to be an expert or anything, and I’ve only become somewhat
> knowledgeable about 3D metal printing, but from what I understand, parts
> can be made at a lower cost than machining/casting, the part is stronger
> due to lower porosity, and special parts can be made that are not possible
> by other methods due to intricate designs and cost. You can also print
> dozens of parts at the same time. I think this warrants some on-line
> searching this weekend if I can find the time.
>
> I would guess that since 3D metal printing is something relatively new,
> there may be some limitations on the size of the parts. Also,I don’t think
> you would use it to make something like a flat bar with a hole in it, but I
> would think that as the technology develops over the years, a lot of
> improvements and capabilities will be developed, as what happens with most
> new technologies.
>
> Carl
> ----- Original Message -----
> From: Henry Miller <hank at millerfarm.com>
> To: at at lists.antique-tractor.com
> Sent: Fri, 06 Dec 2019 22:03:19 -0500 (EST)
> Subject: Re: [AT] repairing machined arts
>
> Traditional casting is much cheaper, once you pay off the cost of the
> making the pattern. We (John Deere) had someone looking for a shift fork
> for the transmission in their 1991 tractor a few years ago. No spare parts
> left in inventory, and the pattern was destroyed years ago, so we 3d
> printed one from the engineering drawings. Cost was just under $500,
> without markup. If the pattern still existed the cost would be about $20
> including markup to pour another one.
>
> Of course if you need a new block a pattern exists, so the 3d metal print
> is what you get. If you can find a few others who need one though investing
> in a pattern is the way to go.
>
> 3d printing plastic is cheap and works okay for a lot of things, but it
> isn't enough quality to replace most parts on our tractors, even ones where
> plastic would be better.
>
> --
>   Henry Miller
>   hank at millerfarm.com
>
> On Fri, Dec 6, 2019, at 4:19 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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